THE GENUS DENDROCTONUS. 95 



Host trees. Pinus strobus, P. t&da, P. rigida, P. virginiana, P. pun- 

 , P. echinata, P. glabm, P. palustris, Picea rubens, and P. excelsa. 



Identified specimens. Le Conte collection, 9; Horn, 1; U.S.N.M., 

 II. &S.,5; D.A.,7; Barber, 2; Hopk. W. Va., 68; Hopk. U. S., more 

 than 150, including all stages and work. 



BIBLIOGRAPHY AND SYNONYMY. 



Dendroctonus frontalis Zimmerman, 1868, p. 149, original description, type/ locality , 

 Carolina. Le Conte, 1868, p. 173, synopsis and reference to p. 149. Xe Conte, 

 1876, p. 386, revision, synopsis, synonymy excluded, bibliography, localities. 

 Packard, 1887, p. 177, Le Conte quoted. Packard, 1890, p. 722, Le Conte quoted. 

 Dietz, 1890, p. 32, in part, fig. 6, antennaand epistoma. Hopkins, 1892a, pp. 64-65, 

 depredations in W. Va. Hopkins, 1892b, p. 353, importation of enemy. Schaufuss, 

 1892, p. 316, introduction of enemy. Hopkins, 1893a, pp. 187-189, habits, etc. 

 Hopkins, 1893b, p. 143, No. 77 and index, habits, host, distribution, enemies. 

 Hopkins, 1893c, p. 213, No. 301, same as 1893b. Hopkins, 1893d, pp. 123-129, 

 habits and enemy. Lintner, 1894, p. 292, reference to Hopkins. Hopkins, 

 1894a, pp. 71-76, same as Hopkins 1893d. Hopkins, 1894c, p. 348, insects, birds, 

 and forests. Lintner, 1895, same as 1894. Hopkins, 1896, pp. 246-250, disap- 

 pearance in W. Va., occurrence in N. C. Hopkins, 1897a, pp. 29-41, importation 

 and distribution of enemy. Hopkins, 1897b, pp. 35-36, enemy, etc. Hopkins, 

 1897c, pp. 79, 94, 95, PL I, dead trees, fig. IV, Clerus formicarius L., discussion of 

 habits, etc., pp. 147, 151, reprint from 1896. Chittenden, 1897, pp. 67, 75, fig. 

 43, adult, destructive habits. Schwarz, 1898, p. 81, habits and disappearance. 

 Hopkins, 1898b, pp. 104-105, habits, etc. Hopkins, 1899a, pp. 394-414, etc. (see 

 index), full account, all stages and work illustrated and described, natural ene- 

 mies, hosts, distribution, bibliography, etc. Hopkins, 1899b, pp. 11, 13, 14, 

 reference to habits. Hopkins, 1899c, p. 343, disappearance in W. Va. due to freez- 

 ing. Chittenden, 1899, pp. 55, 56, fig. 5, habits, etc. Ulke, 1902, pp. 36, 56, host, 

 habits, etc., in D. C. Hopkins, 1903a, p. 59, occurrence and habits in southern 

 States. Hopkins, 1903b, pp. 270, 275, figs. 26, 27, 28-32, stages and work, with 

 account of habits, life history, etc. Hopkins, 1904, pp. 41, 42, 44, PL I, fig. 2, 

 PI. VII, figs, a, b, stages and work, account of distribution, habits, etc. Felt, 



1905, p. 6, reference. Hopkins, 1906c, p. 81, mentioned in comparison. Webb, 



1906, pp. 20, 22, mentioned. Hopkins, 1908, p. 163, depredations. 

 Bostrichus frontalis (not of Fab.) Zimmerman, 1868, p. 149, synonymical reference. 



Le Conte, 1868, p. 173. 



Dendroctonus pinicida Hopkins, 1902a, p. 3, manuscript name only. 

 l)i 1 1 droctonus frontalis Zimm. var. destructor Hopkins, 1902b, p. 21, note. Hopkins, 



1902c, p. 20, habits, etc. 

 Dendroctonus brevicornis Dietz, 1890, p. 32 (in part). 



5. Dendroctonus arizonicus n, sp. $ 



(PI. Ill, fig. 5.) 



Adult. Type of species, female: Length, 3.7 mm., dark brown. 

 Elytra! declivity with long hairs confined to declivity and posterior 

 lateral areas. Head with front convex, shining, and with distinct 

 frontal tubercle each side of a broad median groove. Elytral striae 

 distinctly punctured; the interspaces with subacute, moderately 

 coarse rugosities, distinctly coarser toward the base and vertex. 

 Pronoturn with long erect hairs on the anterior half of the lateral 

 area. Secondary sexual characters same as in D. frontalis. 



