^{page 21 note 1} Ambrosia Beetles of the United States; H. G. Hubbard; Bull. No. 7, new series, U. S. Department of Agriculture, Div. of Entomology, 1897, pp. 9–30; also Year Book, 1896, pp. 421–430.

^{page 21 note 2} Bostrichus xylographus, Jour, Acad. Nat. Sci., Phila., 1826, Vol. V., p 256.

^{page 21 note 3} Catalogue of Insect of Pennsylvania, 1806.

Quotaition from Schwatz in Proc. U. S. Nat. Museum, Vol. XVIII., p. 610.

^{page 21 note 4} Tomicus xylographus, Fitch, 4th Rep. Ins. of N. Y., 1858, p. 716.

^{page 21 note 5} Bull. 7, U. S. Ent. Com., Insects Iniurious to Forest and Shade Trees.

^{page 22 note 6} Ratzburg Forstein, 1837, Vol. I., p. 168.

^{page 22 note 7} Letter from W. Eichhoff to Dr. C. V. Riley in 1892, published in Proc. U. S. Nat. Museum, Ibid. p. 609, from which we quote the following: “The cannot be the slightest doubt that the species you sent me as Xyleborus xylographus. Say ‥ is identical with the European X. saxeseni, Ratzburg It is certainly remarkable that this synonymy comes to light only now, and that Ratzburg's name has to be suppresed after it has been in use for more than fifty years. X. pini, Eich., must now again take its rank as a distinct species.”

^{page 22 note 8} Ento. Amer. II. p. 41.

^{page 22 note 9} Bull. 31, W. Va. Agr. Expt. Station, p. 136.

^{page 22 note 10} Sexual Characters in Scolytidae, Can. Ent., Vol XXVI., p. 279. The male had been previously described by Wisemann, Stett. Ent. Zeit., 1846, p. 24.

^{page 22 note 1} Trans. Amer. Ent. So., Sep. 1868, p. 145 and 160.

^{page 23 note 1} W. Eichhoff, European Barkenkafer, Berlin, 1881, pp. 280–281.

^{page 24 note 1} ln a brood-chamber before me just cut from a neay-by apple tree, I find a pupa minus an abdomen. No predaceous enemies can be found, but two or three half-grown larvae are in snch a position as to make the circumstantial evidence quite plain that they are to blame fot the mutilation. The remaining portion of the pupa is in a normal condition, which would indicate that the attack had been recent and when the victim was alive. This would also indicate that the helpless pupa may furnish food for the larva in case of a scarcity of ambrosia, or that they may be thus disposed of to prevent an overcrowded brood-chamber.

^{page 25 note 1} In a brood-chamber before me a number of dead larvae and pupae are found, which have evidently died quite recently from a disease of some sort which cannot at present be studied or determined.

^{page 25 note 2} European Bark Beetles, l. c.

^{page 25 note 3} Ambrosia Beetles of North America, l. c.

^{page 25 note 4} Bull. 31, W. Va. Agri. Expt. Sta., l. c.

^{page 26 note 1} This statement is not meant to even suggest the inaccuracy of the records of other writers, since I have reasons for doubting that the species I observed is a true X. dispar, and even if it is, habits of the same insect may differ under different environments.

^{page 28 note 1} Female—Bostrichus xylographus, Say, 1829, l. c.

Bostrichus saxeseni, Ratzburg, 1837, l. c.

Tomicus dohrnii, Woll., 1854, Ins. Mad., p. 290.

Xyleborus drygraphus, Ferrari 1867, Barkenk., p.20

^{page 29 note 2} Male—Bostrichus saxeseni, Weism., 1846, Stett., Ent. Zeit., p. 24.

Bostrichus decolor, Boield, 1859, Ann. Soc. Ent. Fr., p. 479.

Xyleborus aescuii, Ferrari (1867?), Barkenk., p.22

Xyleborus subdepressus, Rey, Rev. d'Ento. par Fauv. 2, 142.

Xyleborus xylographus, Hopk., 1894, Can. Ent., vol. XXVI, p. 279.