REVISION OF THE GENUS PHLOEOSINUS—BLACKMAN 399 
even though they still appeared vigorous. Some such trees would die 
even though not attacked by insects, but many would probably survive. 
The western half of the country, with its numerous species of 
trees favored by Phloeosinus, is especially rich in species of the genus. 
Of the 40 species known to occur in the United States and Canada, 
35 are found in the western half and only 5 in the eastern half. The 
Pacific Coast States are especially rich in this group, both as to 
number of species and number of individuals. 
I am very grateful for the hearty cooperation of the western field 
men of the Division of Forest Insect Investigations of the Bureau of 
Entomology and Plant Quarantine, United States Department of 
Agriculture, in furnishing much of the material on which this study 
is based. Without the thousands of specimens from the collections 
of the several field stations, no thorough study of the genus would 
have been possible. I am, therefore, under great obligations to J. M. 
Miller, of the Berkeley, Calif., laboratory; F. P. Keen, of the Port- 
land, Oreg., laboratory; J. C. Evenden, of the Coeur d’Alene, Idaho, 
station; and R. L. Furniss and Donald DeLeon, of the Fort Collins, 
Colo., station; and to the men working with them for this indis- 
pensable assistance. 
Sincere thanks are also extended to W. J. Chamberlin, of Oregon 
State College, Corvallis, Oreg., for the loan of his specimens of 
Phloeosinus, including several paratypes; to J. E. Knull, of Ohio 
State University, for his collection of the genus, including paratypes 
of granwatus Bruck and variolatus Bruck; and to Donald DeLeon, 
of the Bureau of Entomology and Plant Quarantine, United States 
Department of Agriculture, for his private collection taken in the 
Southwestern States and in Mexico. I wish also to thank most cor- 
dially P. J. Darlington, Jr., of the Museum of Comparative Zoology 
of Harvard University, Cambridge, M ass., for his kindness and pains- 
taking care in comparing specimens 2s for that purpose with the 
type of P. serratus (LeConte). 
Genus PHLOEOSINUS Chapuis 
Phloeosinus CHAPuIS, Synopsis des Scolytides, p. 37, 1869; Extr. Mem. Soc. Roy. 
Sci. Liége, p. 245, 18783.—LeContr, Proc. Amer. Philos. Soc. vol. 15, p. 381, 
1876.—EicHuHorr, European Borkenkifer, p. 131, 1881.—LeConTr and Horn, 
Coleop. North Amer., p. 523, 1883.—BkEpEL, Fauna Coleop. Seine, vol. 6, p. 
389, 1888.—ReITTrErR, Verh. Naturf. Ver. in Briinn, vol. 33, p. 49, 1894.— 
BLANDFoRD, Trans. Ent. Soc. London, 1894, p. 68; Biol. Centr. Amer., Coleop., 
vol. 4, pt. 6, p. 160, 1897.—BarsrEy, Scolytidae l’Europ. Cent., p. 58, 1901.— 
SwaInk, New York State Mus. Bull. 134, p. 128, 1909.—Hopxtns, Proc. U. S. 
Nat. Mus., vol. 48, p. 126, 1914.—-SwaInr, Canada Dept. Agr., Ent. Branch, 
Bull. 14, pt. 2, pp. 67-70, 1918.— BLackMAN, Mississippi Agr. Expt. Sta. Techn. 
Bull. 11, pp. 59-61, 1922—W. J. CHAMBERLIN, Bark and timber beetles of 
North America, pp. 168-182, 1939. 
