264 MEMOIRS ON THE COLEOPTERA 



what more than half as long as the body. Length (cf, 9) 

 18.5-19.5 mm.; width 4.6-5.5 mm. Colorado (Boulder Co.). 



impressa n. subsp. 



B Similar to impressa but not quite so elongate, the pronotal impres- 

 sion similar but having the feeble tubercle, not at basal fourth of 

 the pronotum, but just behind the middle of the length; antennae 

 shorter, barely half as long as the body; scutellum similarly im- 

 pressed along the middle; elytra parallel, with very straight sides, 

 the raised lines scarcely so evident; surface more shining, the 

 punctures similarly very fine and close-set throughout. Length 

 (c?) 16.8 mm.; width 4.5 mm. New Mexico (Cloudcroft), 



Knaus rectipennis n. subsp. 



3 Body larger and less slender, black, dull, the elytra blackish-brown; 

 head large, fully four-fifths as wide as the prothorax, deeply canal- 

 iculate along the median line, extremely densely, not coarsely punc- 

 tate, the large eyes feebly emarginate, separated by twice their 

 width; antennae (cf ) nearly four-fifths as long as the body, the first 

 five joints very stout and gradually stouter basally, joints six to 

 eleven abruptly thinner and also gradually feebly tapering distad, 

 the last but little longer than the tenth and not appendiculate; 

 prothorax nearly one-half wider than long, parallel and evenly 

 rounded at the sides, extremely densely, not very finely punctate 

 throughout, with the broadly impressed median line laterally dilated 

 anteriorly, the surface also feebly, transversely impressed before 

 the base nearly throughout and with two large deep rounded discal 

 impressions; scutellum finely, very densely punctate; elytra long, 

 subparallel, but slightly wider at the humeri, rounded, not dehiscent 

 and unarmed at apex, minutely, very densely punctate and with 

 larger, rather close-set punctures intermingled, becoming obsolescent 

 apically, the two discal raised lines distinct, the surface not otherwise 

 uneven; hind tarsi (cf ) two-thirds as long as the tibiae, only moder- 

 ately slender, the basal joint more than two-fifths of the entire 

 length, second two and one-half times as long as wide, third a little 

 longer than wide, cleft almost to the base, the under surface densely 

 padded and with the usual fine glabrous canaliculation entire and 

 equal. Length (cf) 19.5-20.0 mm.; width 5.0 mm. Colorado 



(Boulder Co.) spissicornis n. sp. 



A Similar to spissicornis in its dull surface, fine dense sculpture and 

 in all other features, except that it is narrower in form, with the 

 elytra more tapering and dehiscent near the apex, the head a little 

 smaller, the antennae slightly longer, notably less thickened 

 basally, though of similar proportion among the joints, the pro- 

 thorax even shorter, not rounded but broadly medially angulate 

 at the sides, the median line much more broadly impressed, the 

 adjoining surface more longitudinally tumid and the discal con- 

 cavities obsolete; fifth male ventral similar though a little less 

 transverse, the truncature not quite so wide, less pubescent and 

 more distinctly sinuate. Length (cf ) 17.5 mm.; width 4.7 mm. 



Colorado (Boulder Co.) longicornis n. subsp. 



Body smaller, relatively much more slender and parallel, dark red- 



