26 Bulletin of the Brooklyn Entomological Society Vol.X 



Cortico'tomus contains but the two species in Central America, 

 the two in eastern North America, and two in western North 

 America. They resemble very closely in shape and habits, the 

 members of the preceding genus and two of them are similarly 

 ornamented. 



Key to the North American Species of the Two Genera. 



Head deeply triangularly emarginate and impressed at apex, mandibles 



deflexed genus Neniosoma Latr. 



Black with pronotum and base of elytra rufous, larger and stouter, 



about five times as long as broad (Cal.) fissiceps Fall. 



Black with base of elytra rufous, smaller and more linear, about six 



times as long as broad (Cal.) attenuatum n. sp. 



Head not triangularly emarginate and impressed at apex, mandibles 



uplifted genus Corticotomus Sharp. 



Front quite flat, head scarcely impressed behind. 



Piceous with base of elytra and often apex rufescent (Eastern 



States) cylindricus Lee. 



Rufous or castaneous throughout, with legs and antennse somewhat 

 lighter. 



With elylral intervals impunctate (Cal.) calif ornicus n. sp. 



With elytral intervals distinctly punctate (Atlantic States). 



parallelus Melsh. 



Front broadly concave, head transversely impressed posteriorly (Ariz., 



N. Mex., Col., Cal.) caviceps Fall. 



Nemosoma Lat. Nouv. Diet. d'Hist. Nat., ist ed., XXIV, 

 Tab. Meth., p. 157, 1807; Nemosoma Latr. Gen. Crust, et Insect., 

 1809 ; PseudaHndria Fall. Trans. Am. Ent. Soc, XXXVI, No. 2, 

 p. 126, 1910. 



N. fissiceps Fall. PseudaHndria fissiceps Fall, Trans. Am. Ent. 

 Soc, XXXVI, No,. 2, p. 126, 1910. 



This species seems to be confined to the Sierra Nevada Moun- 

 tains of California. The specimens upon which the original de- 

 scription was based, were caught by myself in the early spring of 

 1898 at Forest Hill, Placer County, flying about woodpiles, pre- 

 sumably of Douglas fir (Pseudotsuga taxifoHa Britt.) though 

 some yellow pine (Pinus ponderosa Laws) might have been 

 present. Mr. Ralph Hopping has captured four specimens in the 

 mountains of Fresno Co., on yellow pine. I know of but one 

 other specimen, in the collection of Dr. George Horn. 



