804 Bulletin American Museum of Natural History. [Vol. XXIII. 



1881. EichhofE, W. Die Europiiischen Borkenkafer. Berlin, J. Springer, 1881, 

 pp. 280-281. 



1906. Felt, E. P. Insects Affecting Park and Woodland Trees. N. Y. State 



Museum, Mem. 8, Albany, N. Y. 1906. pp. 369-396. 

 1895. Gothe, R. Bericht d. k. Lehranst. f. Obst-, Wein-u. Gartenbau zu Geisen- 

 heim (1894-95), 1895, p. 25. 



1907. Hagedorn. Pilzzlichtende Borkenkafer. Naturwiss. Wochcnschr., Keue 



Folgc, 6. Bd. No. 19. 12 Mai, 1907, pp. 289-293. 12 figg. 

 1844. Hartig, T. Allgem. Forst-u. Jagtzeitg. B. XIII, 1844, pp. 73, 74. 

 1872a. Hartig, T. Der Fichtensplintkafer Bostrichus (Xyloterus) lineatus. 



Ibid.. XLVIII, 1872, pp. 181-183. 

 1872b. Hartig, T. Der Buchensplintkafer Bostrichus (Xyloterus) domesticus. 



Ibid., XLVIII, 1872, pp. 183-184. 

 1906. Hedgcock, G. G. Studies upon Some Chromogenic Fungi which Discolor 



Wood. Seventeenth Ann. Rep. Missoiiri Boi. Garden, 1906, pp. 59-114, 



pis. iii-xii. 



1898. Hopkins, A. D. On the History and Habits of the "Wood Engraver" 



Ambrosia Beetle — - Xyleborus xylographus (Say) , Xyleborus saxeseni 

 (Ratz.) — ■ with Brief Descriptions of Different Stages. Canad. Entom., 

 XXX, 1898, pp. 21-29, 2 pis. 



1899. Hopkins, A. D. Report on Investigations to Determine the Cause of Un- 



healthy Conditions of the Spruce and Pine from 1880-1893. Bull. 56 



West Virginia Agric. E.rper. Sta.. April, 1899. 

 1904(a). Hopkins, A. D. Insect Injuries to Hardwood Forest Trees. Yearbook 



U. S. Depart. Agric. 1903, Washington, 1904, pp. 313-328, pi. xxxix, 



17 text-figg. 

 1904(b). Hopkins, A. D. Catalogue of Exhibits of Insect Enemies of Forests 



and Forest Products at the Louisiana Purchase Exposition. St. Louis, 



Mo., 1904, Washington, 1904, pp. 15, 16. 



1905. Hopkins, A. D. Insect Injuries to Forest Products. Year-book U. S. 



Dep. Agric. 1904, Washington, 1905, pp. 381-398, 14 figg. 

 1897(a). Hubbard, H. G. The Ambrosia Beetles of the United States. Bull. no. 



7, n. s. Dep. Agric. Div. Entom. 1897, pp. 11-30, 34 figg. 

 1897(b). Hubbard, H. G. Ambrosia Beetles. Yearbook U. S. Dep. Agric. 1906, 



pp. 421-430, Washington, 1897, 7 figg. 



1906. Leisewitz, W. Ueber chitinose Fortbewegungs Apparate einiger (insbeson- 



dere fussloser) Insektenlarven. Miinchen, E. Reinhardt, 1906, 143 pp. 

 46 figg. 

 1839-1844. Ratzeburg. J. T. Die Forstinsekten. 3 vol., Berlin, Nicolai'sche 

 Buchhandl., 1839-1844. 



1895. Ratzeburg, J. T. Lehrbuch der Mitteleuropaischen Forstinsektenkunde. 



8 Aufl. Vienna, Ed. Holzel, Bd. I, 1895. 

 1836. Schmidberger. Beitrage zur Obstbaumzucht und zur Naturgeschichte der 



den Obstbaumen schiidlichen Insecten. Heft. IV, Linz, 1836. 

 1903. von Schrenk, H. The " Bluing "' and the " Red Rot " of the Western Yellow 



Pine, with Special Reference to the Black Hills Forest Reserve, V. S. 



Dep. Agric. Bur. Plant Indust. Bull. No. 26. Washington, 1903, 40 



pp. 14 pll. 



1896. Smith, E.T. Ambrosia. Ampr. Va/., XXX, 1896, pp. 318, 319. 



