386 MEMOIRS ON THE COLEOPTERA 



close and long on the pygidium; head and pronotum finely, very 

 closely punctate, the vertex not modified as it is in veridulus and 

 allied forms; clypeus moderately sinuate, the rounded lobes gradually 

 and very feebly reflexed; prothorax convex, about as long as wide 

 (cf ), to a fourth wider than long ( 9 ) ; hairs near the basal angles very 

 long, forming a dense brush-like cluster, the surface with a little 

 tomentum near the hind angles in the female; scutellum narrow, very 

 densely punctured and with a dense brush of long hairs, the smooth 

 margins extremely fine; elytra large, only a little shorter than wide, 

 not much narrowed from near the base and very much wider than 

 the prothorax in both sexes; fine striae forming the double lines ex- 

 tremely approximate; surface nearly even, finely, sparsely punctate 

 throughout; at each side there are two very long and obliquely 

 transverse tomentose lines, the posterior extending sometimes almost 

 to the suture and very much longer than it ever is in affinis, the 

 second interval with a long line of tomentum as a rule; pygidium (cf ) 

 scarcely wider than long, convex, or ( 9 ) much shorter and wider, 

 not so convex and flattened apically as in the viridulus section, in 

 both sexes having a large spot of tomentum at each side, the hairs 

 long and very abundant; hind tarsi two-thirds longer than the tibiae 

 (cf ), or less than one-half longer ( 9 ) ; fifth ventral without a lateral 

 line of tomentum. Length (cf 9 ) 9.0-11.0 mm.; width 4.8-5.4 mm. 

 Wisconsin to Colorado. Very abundant. [Trichiiis assimilis 

 Kirby and bistriga Newm.] assimilis Kirby 



Color black, the head and prothorax with brighter, the elytra with more 

 obscure, green metallic lustre; body stout, with the surface very 

 shining; head and pronotum with the small punctures distinctly less 

 dense than in ventricosus, the pubescence less abundant and not so 

 conspicuous, nearly as in assimilis, the prothorax (cf) rather large 

 and trapezoidal, the long erect fringe of hairs at the basal angles 

 distinct; elytra in form nearly as in the preceding but with still 

 finer and sparser punctures and very short sparse hairs, longer 

 basally, where there is a short dash of tomentum along the suture; 

 striae of the double series not so approximate; surface not at all paler 

 suturally, having at each side two coarse and slightly oblique, 

 transverse rufescent lines, extending sometimes to inner third, the 

 outer part, but only that on the steep flanks, tomentose, the line of 

 tomentum on the second interval completely wanting; pygidium (cf ) 

 nearly as long as wide, convex, tomentose laterally, the crenulate 

 incised lines not so densely placed as in the preceding, the hairs less 

 conspicuous though moderately long; hind tarsi (cf ) nearly twice as 

 long as the tibiae. Length (cf ) 10.0 mm.; width 5.6 mm. Probably 

 from the Lake regions. One example. [ Trichius viridans Kirby and 

 mutabilis Schaum] viridans Kirby 



Color black, with dark green metallic lustre [throughout above and 

 on the pygidium, the under surface and legs black, the latter with 

 very feeble greenish lustre; surface very shining throughout, the 

 pubescence long, gray, fine and abundant, sparser and shorter on 

 the elytra, conspicuous on the under surface, legs, pygidium and 

 prothorax, finer than in viridans and everywhere rather denser; 



