Benson, R.B. 1963. A character gradient in Sirex juvencus L. (Hym., Siricidae). Entomologist's mon. Mag. 98 (1962): 252–253.Google Scholar

Čapek, M. 1970. A new classification of the Braconidae (Hymenoptera) based on the cephalic structures of the final instar larva and biological evidence. Can. Ent. 102: 846–875.Google Scholar

Clausen, C.P. 1976. Phoresy among entomophagous insects. A. Rev. Ent. 21: 343–368.10.1146/annurev.en.21.010176.002015Google Scholar

Evans, H.E. 1957. Studies on the larvae of digger wasps (Hymenoptera, Sphecidae). Part III. Philanthinae, Trypoxylinae, and Crabroninae. Trans. Am. ent. Soc. 83: 79–117 + XX pl.Google Scholar

Evans, H.E. 1958. Studies on the larvae of digger wasps. Part IV. Astatinae, Larrinae and Pemphredoninae. Trans. Am. ent. Soc. 84: 109–139 + VIII pl.Google Scholar

Evans, H.E. 1959. Studies on the larvae of digger wasps. Part V. Conclusion. Trans. Am. ent. Soc. 85: 137–191 + XXIV pl.Google Scholar

Evans, H.E. 1964. Further studies on the larvae of digger wasps (Hymenoptera, Sphecidae). Trans. Am. ent. Soc. 90: 235–299 + 19 pl.Google Scholar

Evans, H.E. 1966. The behaviour patterns of solitary wasps. A. Rev. Ent. 11: 123–154.Google Scholar

Evans, H.E. and Lin, C.S.. 1955. Studies on the larvae of digger wasps (Hymenoptera, Sphecidae). Part I. Sphecinae. Trans. Am. ent. Soc. 81: 131–153 + VIII pl.Google Scholar

Evans, H.E. and Lin, C.S.. 1956. Studies on the larvae of digger wasps (Hymenoptera, Sphecidae). Part II. Nyssoninae. Trans. Am. ent. Soc. 82: 35–66 + XIV pl.Google Scholar

Faegri, K. and Pijl, L. van der. 1971. The principles of pollination ecology. Pergamon Press, Oxford. 2nd ed. 291 pp.Google Scholar

Fye, R.E. 1965 a. The biology of the Vespidae, Pompilidae and Sphecidae (Hymenoptera) from trap nests in northwestern Ontario. Can. Ent. 97 716–744.Google Scholar

Fye, R.E. 1965 b. The biology of Apoidea taken in trap nests in northwestern Ontario (Hymenoptera). Can. Ent. 97: 863–877.Google Scholar

Hamilton, W.D. 1964. The genetical evolution of social behaviour. I and II. J. theoret. Biol. 7: 1–52.Google Scholar

Hobbs, G.A. and Lilly, C.E.. 1954. Ecology of species of Megachile Latreille in the mixed prairie region of southern Alberta with special reference to pollination of Alfalfa. Ecology 35: 453–462.Google Scholar

Kevan, P.G. 1973. Parasitoid wasps as flower visitors in the Canadian high arctic. Anz. Schädlings. Pflanz. Umweltsch. 46: 3–7.Google Scholar

Knerer, G. and Atwood, C.E.. 1973. Diprionid sawflies: polymorphism and speciation. Science, N.Y. 179: 1090–1099.Google Scholar

Krombein, K.V. 1967. Trap nesting wasps and bees. Smithsonian Press, Washington, D.C.576 pp.Google Scholar

Michener, C.D. 1953. Comparative morphological and systematic studies of bee larvae, with a key to the families of Hymenopterous larvae. Univ. Kans. Sci. Bull. 35: 987–1102.Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. 2. 1420 pp.Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. [First supplement, 1958 (305 pp).Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. Second supplement, 1967 (584 pp.).]Google Scholar

[The catalog is under revision, see Bull. ent. Soc. Am. 18: 90 (1972).]Google Scholar

Price, P.W. (Ed.). 1975. Evolutionary strategies of parasitic insects and mites. (Ent. Soc. Am. Symposium, Minneapolis 1974). Plenum Press, N.Y.224 pp.Google Scholar

Short, J.R.T. 1978. The final larval instars of the Ichneumonidae. Mem. Am. ent. Inst. 25. 508 pp.Google Scholar

Vinson, S.B. 1976. Host selection by insect parasitoids. A. Rev. Ent. 21: 109–133.Google Scholar

Wilson, E.O. 1971. The Insect Societies. Belknap Press of Harvard U., Cambridge, Mass.548 pp.Google Scholar

Eidt, D.C. 1964. The life histories, distribution and immature forms of the North American sawflies of the genus Cephalcia (Hymenoptera: Pamphiliidae). Mem. ent. Soc. Can. 59. 56 pp.Google Scholar

Lorenz, H. and Kraus, M.. 1957. Die Larvalsystematik der Blattwespen (Tenthredinoidea und Megalodontoidea). 339 pp. Berlin.Google Scholar

Middlekauff, W.W. 1958. The North American sawflies of the genera Acantholyda, Cephalcia, and Neurotoma (Hymenoptera, Pamphiliidae). Univ. Calif. Publs Ent. 14: 51–168.Google Scholar

Middlekauff, W.W. 1964. The North American sawflies of the genus Pamphilius (Hymenoptera: Pamphiliidae). Univ. Calif. Publs Ent. 38: 1–80.Google Scholar

Ries, D.T. 1937. A revision of the nearctic Cephidae (Hymenoptera). Trans. Am. ent. Soc. 63: 259–324.Google Scholar

Ross, H.H. 1929. Sawflies of the sub-family Dolerinae of America north of Mexico. Ill. Biol. Monogr. 12(3): 1–116.Google Scholar

Smith, D.R. 1969 a. Key to genera of Nearctic Argidae (Hymenoptera) with revisions of the genera Atomacera Say and Sterictiphora Billberg. Trans. Am. ent. Soc. 95: 439–457.Google Scholar

Smith, D.R. 1969 b. Nearctic sawflies. I. Blennocampinae: Adulis and larvae (Hymenoptera: Tenthredinidae). U.S. Dep. Agric. Tech. Bull. 1397. 198 pp.Google Scholar

Smith, D.R. 1969 c. Nearctic sawflies. II. Selandriinae: Adults (Hymenoptera: Tenthredinidae). U.S. Dep. Agric. Tech. Bull. 1398. 58 pp.Google Scholar

Smith, D.R. 1970. Nearctic species of the genus Ptenus Kirby (Hymenoptera: Argidae). Trans. Am. ent. Soc. 96: 79–100.Google Scholar

Smith, D.R. 1971 a. Nearctic sawflies. III. Heterarthrinae: Adults and larvae (Hymenoptera: Tenthredinidae). U.S. Dep. Agric. Tech. Bull. 1420. 102 pp.Google Scholar

Smith, D.R. 1971 b. Nearctic sawflies of the genera Neoptilia Ashmead, Schizocerella Forsius, Aprosthema Konow, and Sphacophilus Provancher (Hymenoptera: Argidae). Trans. Am. ent. Soc. 97: 537–594.Google Scholar

Smith, D.R. 1976. Tne Xiphydriid woodwasps of North America (Hymenoptera:Xiphydriidae). Trans. Am. ent. Soc. 102: 101–131.Google Scholar

Yuasa, H. 1922. A classification of the larvae of the Tenthredinoidea. Ill. Biol. Monog. 7(4): 1–172.Google Scholar

Marsh, P.M. 1961. A taxonomic study of the genera Cremnops Foerster in America north of Mexico (Hymenoptera: Braconidae). Ann. ent. Soc. Am. 54: 851–861.Google Scholar

Marsh, P.M. 1969. The Nearctic Doryctinae, VII. The genus Doryctes Haliday (Hymenoptera: Braconidae). Trans. Am. ent. Soc. 94 (1968): 379–405.Google Scholar

Martin, J.C. 1956. A taxonomic revision of the Triaspidine braconid wasps of Nearctic America (Hymenoptera). Can. Dep. Agric. Publ. 965. 157 pp.Google Scholar

Mason, W.R.M. 1978. A synopsis of Nearctic Braconini, with revisions of Nearctic species of Coeloides and Myosoma (Hymenoptera: Braconidae). Can. Ent. 110: 721–768.Google Scholar

Matthews, R.W. 1970. A revision of the genus Spathius in America north of Mexico (Hymenoptera: Braconidae). Contr. Am. ent. Inst. 4: no. 5. 86 pp.Google Scholar

McComb, C.W. 1968. A revision of the Chelonus subgenus Microchelonus in North America north of Mexico (Hymenoptera: Braconidae). Bull. Md agric. Exp. Stn. 149A. 148 pp.Google Scholar

Muesebeck, C.F.W. 1932. Revision of the nearctic Ichneumon flies belonging to the genus Macrocentrus. Proc. U.S. natn. Mus. 80: art. 23. 54 pp.Google Scholar

Muesebeck, C.F.W. 1970. The nearctic species of Orgilus Haliday (Hymenoptera: Braconidae). Smithson. Contr. Zool. 30. 104 pp.Google Scholar

van Achterberg, C. 1975. A revision of the tribus Blacini (Hymenoptera, Braconidae, Helconinae). Tijdschr. Ent. 118: 159–322.Google Scholar

Barron, J.R. 1976. Systematics of Nearctic Euceros (Hymenoptera: Ichneumonidae: Eucerotinae). Naturaliste can. 103: 285–375.Google Scholar

Dasch, C.E. 1964. Ichneumon-flies of America north of Mexico: 5. Subfamily Diplazontinae. Mem. Am. ent. Inst. 3. 304 pp.Google Scholar

Dasch, C.E. 1971. Ichneumon-flies of America north of Mexico: 6. Subfamily Mesochorinae. Mem. Am. ent. Inst. 16. 376 pp.Google Scholar

Finlayson, T. 1975. The cephalic structures and spiracles of final instar larvae of the subfamily Campopleginae, tribe Campoplegini (Hymenoptera: Ichneumonidae). Mem. ent. Soc. Can. 94. 137 pp.Google Scholar

Heinrich, G.H. 1961–1962. Synopsis of nearctic Ichneumoninae Stenopneusticae with particular reference to the northeastern region (Hymenoptera) Parts I–VII. Can. Ent. Suppl., nos. 15, 18, 21, 23 (1961), 26, 27, 29 (1962). pp. 1–888.Google Scholar

Peck, O. 1964. Synopsis of nearctic Ichneumoninae Stenopneusticae with particular reference to the northeastern region, Part VIII. Mem. ent. Soc. Can. 35. pp. 889–925.Google Scholar

Short, J.R.T. 1959. A description and classification of the final instar larvae of the Ichneumonidae (Insecta, Hymenoptera). Proc. U.S. natn. Mus. 110: 391–511.Google Scholar

Short, J.R.T. 1970. On the classification of the final instar larvae of the Ichneumonidae (Hymenoptera). Supplement. Trans. R. ent. Soc. Lond. 112: 185–210.Google Scholar

Short, J.R.T. 1978. The final larval instars of the Ichneumonidae. Mem. Am. ent. Inst. 25. 508 pp.Google Scholar

Townes, H.K. 1969–1971. The genera of Ichneumonidae, parts 1–4. Mem. Am. ent. Inst. 11 (1969), 12, 13(1970), 17(1971).Google Scholar

Townes, H.K. and Gupta, V.K.. 1962. Ichneumon-flies of America north of Mexico: 4. Subfamily Gelinae, tribe Hemigasterini. Mem. Am. ent.Inst. 2. 305 pp.Google Scholar

Townes, H.K. and Townes, M.C.. 1959. Ichneumon-flies of America north of Mexico: 1. Subfamily Metopiinae. U.S. natn. Mus. Bull. 216. 318 pp.Google Scholar

Townes, H.K. 1960. Ichneumon-flies of America north of Mexico: 2. Subfamilies Ephialtinae, Xoridinae, Acaenitinae. U.S. natn. Mus. Bull. 216, pt. 2. 676 pp.Google Scholar

Townes, H.K. 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. U.S. natn. Mus. Bull. 216, pt. 3. 602 pp.Google Scholar

Annecke, D.P. and Doutt, R.L.. 1961. The genera of the Mymaridae. Hymenoptera: Chalcidoidea. Ent. Mem. Dep. Agric. Tech. Serv. Repub. S. Afr. 5. 71 pp.Google Scholar

Ashmead, W.H. 1904. Classification of the chalcid flies. Mem. Carnegie Mus. 1: 1–XI, 225–551.Google Scholar

Burks, B.D. 1958. in Krombein, et al. , Hymenoptera of America north of Mexico. Synoptic Catalog. Agriculture Monogr. 2(1): 62–84.Google Scholar

Burks, B.D. 1967. in Krombein, and Burks, . Hymenoptera of America north of Mexico. Synoptic Catalog. Agriculture Monogr. 2(2): 213–282.Google Scholar

Burks, B.D. 1971. A synopsis of the genera of the family Eurytomidae (Hymenoptera: Chalcidoidea). Trans. Am. ent. Soc. 97: 1–89.Google Scholar

Doutt, R.L. and Viggiani, G.. 1968. The classification of the Trichogrammatidae (Hymenoptera: Chalcidoidea). Proc. Calif. Acad. Sci. 35 (20): 477–586.Google Scholar

Ferrière, Ch. 1965. Hymenoptera Aphelinidae d'Europe et du bassin Meditérranéan. Faune de L'Europe et du bassin Meditérranéen. Masson, Paris. 206 pp.Google Scholar

Graham, M.W.R. de V. 1969. The Pteromalidae of Northwestern Europe. (Hymenoptera: Chalcidoidea). Bull. Brit. Mus. nat. Hist. (Ent. Suppl.) 16. 352 pp.Google Scholar

Nikol'skaya, M.N. 1952. [The chalcid Fauna of the USSR (Chalcidoidea)]. 574 pp.Google Scholar

English translation, 1963. Birron, A. and Cole, Z.S.. Israel Program for Scientific Translation. 593 pp.Google Scholar

Noyes, J.S. 1978. On the numbers of genera and species of Chalcidoidea (Hymenoptera) in the world. Ent. Gaz. 29: 163–164.Google Scholar

Peck, O.in Muesebeck, et al. 1951. Hymenoptera of America north of Mexico, Synoptic Catalog. Agriculture Monogr. 2: 583–594.Google Scholar

Peck, O. 1963. A catalogue of the Nearctic Chalcidoidea (Insecta: Hymenoptera). Can. Ent. Suppl. 30. 866 pp.Google Scholar

Peck, O., Boucek, Z., and Hoffer, A.. 1964. Keys to the Chalcidoidea of Czechslovakia (Insecta: Hymenoptera). Mem. ent. Soc. Can. 34. 120 pp.Google Scholar

Trjapitzin, V.A. 1971. Review of genera of Palearctic Encyrtids (Hymenoptera, Encyrtidae). Trans. All-union ent. Soc. 54: 68–119.Google Scholar

Yoshimoto, C.M. 1975. Cretaceous chalcidoid fossils from Canadian amber. Can. Ent. 107: 499–528.Google Scholar

Andrews, F.G. 1978. Taxonomy and host specificity of Nearctic Alioxystinae with Catalog of the world species (Hymenoptera: Cynipidae). Occ. Pap. St. Calif. Dep. Food Agric. 25. 128 pp.Google Scholar

Ceballos, G. 1943. Los Tribus de los Himenópteros de Espana. Superfamilia Cynipoidea. XII. Familia Cynipidae. pp. 219–229.Google Scholar

Hedicke, H. and Kerrich, G.J.. 1940. A revision of the family Liopteridae (Hymenoptera, Cynipidae). Proc. R. ent. Soc. Lond. 90: 177–225.Google Scholar

Kieffer, J.J. 1910. in von Dalla Torre, K.W.. Das Tierrcich, Lief. 2.4. Friedländen, Berlin. 891 pp.Google Scholar

Kinsey, A.C. 1930. The fall wasp genus Cynips, a study in the origin of species. Indiana Univ. Stud. 16 (84,85,86). 577 pp.Google Scholar

Shorthouse, J.D. 1973. The insect community associated with rose galls of Diplolepis polita (Cynipidae, Hymenoptera). Quaest. ent. 9: 55–98.Google Scholar

Weld, H.L. 1952. Cynipoidea (Hym.) 1905–1950 being a supplement to the Dalla Torre and Kieffer monograph — the Cynipidae in Das Tierreich, Lieferung 24, 1910, and bringing the systematic literature of the world up to date, including keys to families and subfamilies and lists of new generic, specific and variety names. Ann Arbor, Michigan. Privately printed.Google Scholar

Rasnitsyn, A. 1972. [Hymenoptcrous insects of the family Preaulacidae from the Upper Jurassic of Karatau.] (In Russian.) Paleont. J. 1: 70–87.Google Scholar

Townes, H.K. 1949. The Nearctic species of Evaniidae (Hymenoptera). Proc. U.S. natn. Mus. 99: 525–539.Google Scholar

Townes, H.K. 1950. The Nearctic species of Gasteruptiidae (Hymenoptera). Proc. U.S. natn. Mus. 100: 85–145.Google Scholar

Ashmead, W.H. 1893. A monograph of the North American Proctotrypidae. Bull. U.S. natn. Mus. 45. 472 pp.Google Scholar

Masner, L. 1964. A comparison of some Nearctic and Palearctic genera of Proctotrupoidea (Hymenoptera) with revisional notes. Acta Soc. ent. Czechosl. 61: 123–155.Google Scholar

Masner, L. 1976. Revisionary notes and keys to world genera of Scelionidae (Hymenoptera: Proctotrupoidea). Mem. ent. Soc. Can. 97. 87 pp.Google Scholar

Masner, L. and Muesebeck, C.F.W.. 1968. The types of Proctotrupoidea (Hymenoptera) in the United States National Museum. U.S. natn. Mus. Bull. 270. 143 pp.Google Scholar

Muesebeck, C.F.W. and Masner, L.. 1967. In Krombein, K.V. and Burks, B.D., Hymenoptera of America North of Mexico, Synoptic Catalog, Second Supplement. Agriculture Monogr. 2(3), pp. 285–305.Google Scholar

Townes, H.K. 1948. The serphoid Hymenoptera of the family Roproniidae. Proc. U.S. natn. Mus. 98: 85–89.Google Scholar

Townes, H.K. in press. Serphidae.Google Scholar

Masner, L. and Dessart, P.. 1967. Le reclassification des categories taxonomiques superieures des Ceraphronoidea (Hymenoptera). Inst. roy. Sci. nat. Belg. 43: 1–33.Google Scholar

Evans, H.E. 1964. A synopsis of the American Bethylidae (Hymenoptera, Aculeata). Bull. Mus. comp. Zool. Harv. 132. 222 pp.Google Scholar

Townes, H.K. 1956. The Nearctic species of trigonalid wasps. Proc. U.S. natn. Mus. 106: 295–304.Google Scholar

Cole, A.C. 1968. Pogonomyrmex harvester ants. A study of the genus in North America. Univ. Tennessee Press, Knoxville. 222 pp.Google Scholar

Creighton, W.S. 1950. The ants of North America. Bull. Mus. comp. Zool. Harv. 104. 585 pp.Google Scholar

Finnegan, R.J. 1975. Introduction of a predacious wood ant, Formica lugubris (Hymenoptera: Formicidae) from Italy to eastern Canada. Can. Ent. 107: 1271–1274.Google Scholar

Finnegan, R.J. 1977. Establishment of a predacious red wood ant, Formica obscuripes (Hymenoptera: Formicidae) from Manitoba to eastern Canada. Can. Ent. 109: 1145–1148.Google Scholar

Francoeur, A. 1973. Revision taxonomique des espèces néarctiques du groupe fusca, genre Formica (Formicidae, Hymenoptera). Mem. Soc. ent. Québ. 3. 316 pp.Google Scholar

Francoeur, A. 1974. Nouvelles données et remarques su la répartition nordique de quelques Formicides (Hymenopteres) néarctiques. Naturaliste can. 101: 935–936.Google Scholar

Francoeur, A. 1977. Synopsis taxonomique et économique des fourmis du Québec. Annls Soc. ent. Québ. 22(3): 205–212.Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America North of Mexico. Synoptic Catalog. Agriculture Monogr. 2: 778–875 (Family Formicidae by M.R. Smith). First supplement in 1958. Second supplement in 1967.Google Scholar

Sharplin, J. 1966. An annotated list of the Formicidae of central and southern Alberta. Quaest. ent. 2: 243–253.Google Scholar

Smith, M.R. 1957. Revision of the ant genus Stenamma Westwood in America north of Mexico. Am. Midi. Nat. 57: 133–174.Google Scholar

Snelling, R.R. 1973. Studies on California ants. 7. The genus Stenamma (Hymenoptera: Formicidae). Los Angeles Co. nat. Hist. Mus. Contrib. Sci. 245. 38 pp.Google Scholar

Wheeler, G.C. and Wheeler, J.. 1963. The ants of North Dakota. University of North Dakota Press, Grand Forks. 326 pp. [1977. North Dakota Ants updated. (Desert Res. Inst., Univ. Nevada, Reno, Nevada.) 27 pp.]Google Scholar

Wheeler, G.C. and Wheeler, J.. 1976. Ant larvae: review and synthesis. Mem. ent. soc. Wash. 7. 108 pp.Google Scholar

Wilson, E.O. 1955. A monographic revision of the ant genus Lasius. Bull. Mus. comp. Zool. Harv. 113(1). 199 pp.Google Scholar

Wilson, E.O. 1971. The insect societies. Belknap Press of Harvard University Press, Cambridge, Mass.548 pp.Google Scholar

Wing, M.W. 1968. Taxonomic revision of the nearctic genus Acanthomyops (Hymenoptera: Formicidae). Cornell Univ. agric. Exp. Stn. Mem. 405. 173 pp.Google Scholar

Evans, H.E. 1950. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part I. Trans, Am. ent. Soc. 75: 133–270.Google Scholar

Evans, H.E. 1951 a. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part II. Gzmis Anoplius Dufovu. Trans. Am. ent. Soc. 76: 207–361.Google Scholar

Evans, H.E. 1951 b. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part III. Trans. Am. ent. Soc. 77: 203–340.Google Scholar

Miller, C.D.F. 1961. Taxonomy and distribution of Nearctic Vespula. Can. Ent. Suppl. 22. 52 pp.Google Scholar

Steiner, A.L. 1970. Solitary wasps from subarctic North America—I. Pompilidae from the Northwest Territories and Yukon, Canada. Quaest. ent. 6: 223–244.Google Scholar

Townes, H.K. 1957. Nearctic wasps of the subfamilies Pepsinae and Ceropalinae. U.S. natn. Mus. Bull. 209. 286 pp.Google Scholar

Bohart, R.M. and Menke, A.S.. 1976. Sphecid wasps of the world, a generic revision. Univ. Calif. Press, Berkeley. 695 pp.Google Scholar

Evans, H.E. 1966. The comparative ethology and evolution of the sand wasps. Harvard Univ. Press, Cambridge, Mass.526 pp.Google Scholar

Malyshev, S.I. 1968. Genesis of the Hymenoptera and the phases of their evolution. (Translated from the Russian.) Richard Clay (The Chaucer Press), Ltd., Suffolk, England. 319 pp.Google Scholar

Scullen, H.A. 1965. Review of the genus Cerceris in America north of Mexico. Proc. U.S. natn. Mus. 116: 333–548.Google Scholar

Scullen, H.A. 1968. A revision of the genus Eucerceris Cresson. U.S. natn. Mus. Bull. 268. 97 pp.Google Scholar

Steiner, A.L. 1973. Solitary wasps from subarctic North America II. Sphecidae from the Yukon and Northwest Territories, Canada: distribution and ecology. Quaest. ent. 9: 13–34.Google Scholar

Strandtmann, R.W. 1946. A review of the North American species of Philanthus, north of Mexico. Ohio State Univ. Press, Columbus. 126 pp.Google Scholar

Baker, J.R. 1975. Taxonomy of five Nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). Univ. Kans. Sci. Bull. 50: 649–730.Google Scholar

Donovan, B.J. 1977. A revision of North American bees of the subgenus Cnemidandrena (Hymenoptera: Andrenidae). Univ. Calif. Publs Ent. 81: 1–106.Google Scholar

Eickwort, G.C. 1969. A comparative morphological study and generic revision of the Augochlorine bees (Hymenoptera: Halictidae). Univ. Kans. Sci. Bull. 48: 325–524.Google Scholar

LaBerge, W.E. 1964. Podromus of the genus Andrena of the Western Hemisphere. Bull. Nebr. St. Mus. 4: 279–316.Google Scholar

Linsley, E.G. 1958. The ecology of solitary bees. Hilgardia 27: 543–599.Google Scholar

Michener, C.D. 1944. Comparative external morphology, phylogeny, and a classification of bees (Hymenoptera). Bull. Am. Mus. nat. Hist. 82: 151–326.Google Scholar

Michener, C.D. 1953. Comparative morphological and systematic studies of bee larvae with a key to the families of hymenopterous larvae. Univ. Kans. Sci. Bull. 35: 987–1102.Google Scholar

Michener, C.D. 1974. The social behaviour of the bees. A comparative study. Belknap Press of Harvard Univ., Cambridge, Mass.404 pp.Google Scholar

Milliron, H.E. 1971. A monograph of the western hemisphere bumblebees (Hymenoptera: Apidae; Bombinae) I. The genera Bombus and Megabombus Subgenus Bombias. Mem. ent. Soc. Can. 82. 80 pp.Google Scholar

Milliron, H.E. 1973 a. A monograph of the western hemisphere bumblebees (Hymenoptera: Apidae; Bombinae) II. The genus Megabombus subgenus Megabombus. Mem. ent. Soc. Can. 89. 237 pp.Google Scholar

Milliron, H.E. 1973 b. A monograph of the western hemisphere bumblebees (Hymenoptera: Apidae; Bombinae) III. The genus Pyrobombus subgenus Cullumanobombus. Mem. ent. Soc. Can. 91. 333 pp.Google Scholar

Mitchell, T.B. 1960. Bees of the eastern United States. Vol. 1. N.C. agric. Exp. Stn. Tech. Bull. 141. 538 pp.Google Scholar

Mitchell, T.B. 1962. Bees of the eastern United States. Vol. II. N.C. agric. Exp. Stn. Tech. Bull. 152. 557 pp.Google Scholar

Moldenke, A.R. 1976. Evolutionary history and diversity of the bee faunas of Chile and Pacific North America. Wasmann J. Biol. 34: 147–178.Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. 2. 1420 pp.Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. [First supplement, 1958 (305 pp.).Google Scholar

Muesebeck, C.F.W., Krombein, K.V., and Townes, H.K.. 1951. Hymenoptera of America north of Mexico Synoptic Catalog. Agriculture Monogr. Second supplement, 1967 (584 pp.).]Google Scholar

Ordway, E. 1966. Systemadcs of the genus Augochlorella (Hymenoptera:Halictidae) north of Mexico. Univ. Kans. Sci. Bull. 46: 509–624.Google Scholar

Roberts, R.B. 1972. Revision of the bee genus Agapostemon (Hymenoptera:Halictidae). Univ. Kans. Sci. Bull. 49: 437–596.Google Scholar

Snelling, R.R. 1970. Studies on North American bees of the genus Hylaeus. 5. The subgenera Hylaeus s. str. and Paraprosopis (Hymenoptera: Colletidae). Los Angeles Co. Mus., Contrib. Sci. 180. 59 pp.Google Scholar

Stephen, W.P., Bohart, G.E., and Torchio, P.F.. 1969. The biology and external morphology of bees, with a synopsis of the genera of Northwestern America. Agric. Exp. Stn., Oregon St. Univ., Corvallis. 140 pp.Google Scholar