102 GEO. II. HORN, M. D. 



I am inclined to place with this species aptcrus, Miikl., described 

 from a mutilated female, it appears to be very similar to the present 

 species and differs only in having the middle process of last dorsal 

 shorter, which may be due to accident. 



Occurs in Alaska and California. 



T. circ'uniciin'tiis, ISIakl. — Piceous black, shining, elytra castaneous or 

 dark luteous, apical margin darker. Head and thorax black, very minutely 

 punctulate and finely alutaceous. Antennse picenus. Elytra as long as wide, 

 rather coarsely punctured, shining, not visibly alutaceous. Abdomen rather 

 sparsely, coarsely punctulate, distinctly alutaceous. Legs piceo-lestaceous. 

 Length .16 — .20 inch; 4 — 5 mm. 



Male. — Last ventral similar to nir/ricoriiis, sixth scarcely emarginate at middle, 

 a narrow spongy space on the margin, face not concave. Last dorsal normally 

 quadridentate. 



Female. — Last ventral with the middle lobes short and broad, lateral process 

 very short, reduced to mere dentations. Last dorsal with the three lobes 

 ap{)roximated and connate, the middle emarginate at tip, (fig. 26, a, b). 



Occurs in Canada, Michigan, Kansas, Vancouver, Alaska. 



T. nifidiiloides, n. sp. — Pitchy black, sides of thorax and tip of elytra 

 paler. Head and thorax minutely punctulate, not alutaceous. Elytra as wide 

 as long, rather coarsely, deeply and" regularly punctate. Abdomen sparsely 

 punctulate, distinctly alutaceous. Legs piceous. Length .12 inch ; 3 mm. 



Male. — Vential characters as in circumcinctus. Last dorsal trideutate. The 

 usual middle teeth united forming one. 



Female. — Last ventral as in maculicolli.s, ]&st dorsal as \r\ frigidus. 



This species is relatively broader than any other in our fauna, and 

 resembles a Carpophilus at first glance. 

 Occurs from Canada to Maryland. 



T. elorujatus, Gyll. — In addition to the above-mentioned, Manner- 

 heim (Bull. Mosc. 1843, II, p. 227), quotes this species as having 

 occurred in Alaska. I have been entirely unable to identify any of 

 ours with it. 



T ACHY FOR US Grav. 



The species of this genus resemble each other so closely that it is 

 only with great diflSculty that they can be described, so that their 

 feeble differences may be made apparent. There are no variations of 

 sexual characters that can be made available nor is the sculpture very 

 different. The coloration is variable to a certain extent but appears 

 to be the best means of formulating the species. The sexual charac- 

 ters are as follows : 



Male. — Anterior tarsi distinctly dilated. Sixth ventral segment 

 triangularly emarginate, seventh elongate oval. Last dorsal with 

 entire marjirin. 



