THE CANADIAN ENTOMOLOGIST. 105 



THE COLEOPTERA OF CANADA. 



BY H. F. WICKHAM, IOWA CITY, IOWA. 



XXIII. The CERAMBvciDiE of Ontario and Quebec. — (Continued.) 



Tetropium, Kirby. 



This genus is easily recognized among its neighbours by the fact 

 that the eyes are divided by a deep emargination into an upper and a 

 lower portion, these parts being connected only by a narrow band from 

 which the granulations or lenses have been lost. The Canadian T. 

 cinnamopterum, Kirby, is brown, the wing-covers often much lighter than 

 the head and thorax; the entire body is pubescent. Length .50-.70 

 inch. The head and thorax are slightly shining, distinctly punctured, the 

 punctures regular, usually close but distinctly separated. Elytra opaque 

 or extremely feebly shining. Sculpture much finer than that of the pro- 

 thorax. The sexes differ especially in the somewhat shorter antennre 

 and the broader and more strongly rounded prothorax of the female. 

 The species occurs on or under bark of pine logs. 



AsEMUM, Esch. 



Two species are recorded from Canada. They are stout brown 

 insects with short antennae (from about one-third to one-half the length of 

 the body), elytra sometimes yellowish. The thorax is about as broad, in 

 its widest part, as the base of the elytra; the punctuation coarse and close 

 on the pronotum, much finer on the wing-covers. The prin- 

 cipal differences separating the two forms must be looked for 

 in the prothorax, which is rounded on the sides in rnxstum, 

 Hald., and distinctly angulated near the base in atruni, Esch. 

 The distinctness of the elytral costte seems an evanescent 

 character, since certain specimens of the former species 

 approach the latter very closely in that respect. In length 

 A. nixstum (fig. 16) ranges from .45 to .60 inch, while speci- ^''^- '^• 

 mens of atrum are known which slightly exceed the greater measure- 

 ment and others which scarcely reach the lesser. In the larval stage A. 

 moestum is known to infest pine and spruce, and the beetles may be found 



on lumber piles. 



Criocephalus, Muls. 



Contains larger species than the preceding genus, with coarsely 

 granulated eyes which are not hairy. The prothorax is variably 

 sculptured, sometimes roughened and with deep impressions on the disk. 



