The behavior of Polistes pallipes is extremely interesting when they are fed on larvae of the same species from other nests.

The wasps experimented with were made distinguishable from one another by little smears of paint on their bodies. Thereafter it was most convenient to make and keep Indian-like names for them based upon their distinguishing marks. The nests were fastened about the laboratory window frames, just above a porch roof.

Related to crassipes Meigen, to which it traces in my key (Tr. Royal Can. Inst., XV. 252, 1926). It is readily distinguished by the wholly black posterior femora, presence of abundant erect black hair on the upper surface of the anterior tarsi and in having the basal segment of the anterior tarsi shorter than the following three segments instead of longer than the apical four segments. Length 4.75 mm.

While collecting during the spring and early summer of 1927 in the vicinity of Ottawa, Ontario, Canada, the writer secured large numbers of two species of Corixidae which on verification proved to be Arctocorixa bilineata Prov. and Arctocorixa trilineata Prov. To Mr. George Maheux, Provincial Entomologist for Quebec, Canada, the writer is indebted for his comparison of this material with the Provancher types in the Quebec Public Museum.

The two chilopods described below were found in collections recently sent me for identification by the Federal-Horticultural Board and by Mr. R. D. Harwood of Cornell University. The types are in the author's collection.

Head rough tufted on crown, face smooth. Antennae four-fifths the length of the fore wings, basal segment slightly thickened, with pecten. Labial palpi moderately long, drooping, filiform, blunt pointed. Maxillary palpi minute. Middle tibiae with closely appressed scales. Posterior tibiae with closely appressed scales above, short loose hairs beneath. Fore wings lanceolate, elongate; 3 absent, 4 absent, 5 and 6 long stalked, 8 connate with 7, 9 twice as far removed from 8 as from 10, 11 absent. Hind wings about one-half, linear lanceolate; 3 absent, 4 absent, 5 and 6 stalked.

Having read of mites swarming in the nests of various birds and being desirous of acquiring information on the subject, I examined the nest of a house wren, Troglodytes aedon aedon, Vieillot, at Sioux City, Iowa, during the summer of 1927. The young birds had the day before left the nest which was built in a small box located on a pillar of my front porch. When the box was opened and the twigs removed, there was a residue of gray powder in the box, amounting to six or seven drams. The microscope showed this powder to be composed of a seething mass of small mites in all stages of development, in countless numbers. Dr. H. E. Ewing, of the Bureau of Entomology, later pronounced them to be the common chicken mite. Dermanyssus gallinae L.

Female.—Length 8 mm. Vertex three-fourths as broad between eyes as distance from apex of tylus to middle of vertex at a point in line with posterior margins of eyes. Ocelli large, ocellocular line scarcely twice the diameter of an ocellus. Antennal segments proportioned from base, as follows:— 9: 14: 11: 11. Basal antennal slender, extending two-thirds its total length beyond apex of tylus. Bucculae not attaining bases of antennae. Rostrum attaining hind coxae, first segment reaching base of head. Rostral segments proportioned from base, as follows :—9 : 11 : 8 : 4. Vertex sparsely pubescent, somewhat shining, rather granulate becoming weakly transversely rugulose before eye and above antenna. A few scattered, shallow punctures on vertex between eyes. Genae smooth above becoming transversely rugulose toward gular region.

The chain of Rocky Mountains extending south from Canada through western Montana. Wyoming, Colorado and into northern New Mexico produce a series of butterflies which are at prespnt referable under an anicia-brucei classification. Various races from this supposed parental stock are found in southwestern Colorado, Utah, the Great Basin of Nevada and elsewhere with members of the clan branching down into New Mexico. For several years I have been hoping to find representatives of this group reaching over into the Sierra Nevada Mountains of California. In 1927 when on Alta Peak in Sequoia National Park, I took two males and in 1928 Mr. Walter Ireland captured four females in the same locality which I find to be closely related to the above mentioned breed.

Related to medius Jones but lacking a brown, inverted Y shaped frontal vitta, the lower two thirds of the front yellowish pollinose, the lower fourth to third yellow in ground color. Length 11 to 12 mm.