AMERICAN COLEOPTERA. 101 



T. rris:i<1ll^7 Erichs. — Piccous black, shining, margin of thorax, base and 

 sides of elytra and four basal joints of antennfe rufo-testaceous. Head and 

 thorax minutely pimctnlate, finely alutaceous. Elytra slightly longer than 

 •wide, finely punctured, minutely alutaceous. Abdomen more finely punctured 

 than the thorax, finely alutaceous. Length .20 — .24 inch ; 5 — 6 mm. 



Male. — Lacinise of last ventral slender, not elongate, feebly curved, sixth 

 ventral feebly emarginate without granular margin at middle. Last dorsal as 

 in macuUcoUis. 



Female. — Last ventral as in maculicollis. Last dorsal with lateral lobes slender 

 median broader, as long as the lateral, broad at base narrow at tip and rather 

 deeply cleft, (fig. 23). 



This species resembles canademiiA but is distinguished by the cha- 

 racters peculiar to each sex. In the females there is a tendency in 

 the middle lobe of" the last dorsal to become more deeply cleft and 

 the processes rather more divergent. 



Occurs from Pennsylvania to Canada, Alaska and California, and 

 has been erroneously considered as luridns in collections. 



T. C'roteliii, n. sp. — This species resembles frigidiis so closely that no 

 further description is necessary, it is however usually somewhat larger. Length 

 .24— .26 inch; 6—6.5 mm. 



Male. — As \n frigidus. 



Fcvmle. — Last ventral as in friffidus, lacinise somewhat stouter, sixth ventral 

 ■with narrow spongy border at middle. Last dorsal with the outer lobes slender, 

 middle lobe as long, broad at base, tip acute, on each side a slender acute 

 process, (fig. 24). 



Collected by G. 11. Crotch in Vancouver. 



T. iiiiiitabilis, Maklin. — Pitohy black, moderately shining, elytra dark 

 castaneous. Antennae piceous. Head and thorax black, the latter with the 

 sides rarely slightly paler, surface sparsely punctulate and obsoletely alutaceous. 

 Elytra distinctly longer than wide, finely punctate and alutaceous. Abdomen 

 similarly but less distinctly sculptured. Legs picco-testaceous. Length .22 — 

 .24 inch; 5.5 — 6 mm. 



Male. — Similar to nigricornis, without granular S2)ace on the face of segment 

 but a narrow border at middle of emargination. 



Female, — Last ventral as in memnonius. Last dorsal v/ith three slender equal 

 processes, the middle sometimes feebly cleft at tip, (fig. 25). 



The males of this species resemble closely nigricornis^ the females 

 are easily known. 



I had the privilege of examining the types of his remarks and find that his 

 fumipennis and axillaris are but slight variations of the same species. Mr. 

 Austin is mistaken in intimating that Say described "several allied species." 

 T. colonus, Sachse, is by no means distinct from the above. The entire difficulty 

 has arisen, it appears to me, from having 9 /rigidu.i mixed witli fumipennis^ 

 as the former was unknown to Mr. A. at the lime the paper was written. The 

 number of impressed segments of the abdomen is not a specific character as 

 may be demonstrated by any six % specimens oi frigidus. 



