350 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



Pijgidium black and yellow; body beneath blackish, apical ventral margin 

 pale. Legs pale with median blackish or brown shades on the femora, and 

 traces of such on the tibiae. 



Length 2.4 to 2.75 mm.; width 1.3 to 1.45 mm. 



Distribution.— Texas: Flatonia, July 30 (H. A. Wenzel), d' t^pe; Seabrook, 

 Aug. 6 (Wenzel); San Diego, May 3 (Schwarz); Lavaca Co. (Hubbard & 

 Schwarz); "Tex." (Nat. Mus. Coll.). Several females from Columbus (Hub- 

 bard & Schwarz) have the marginal interspace of the el>^ra punctate; they are 

 placed here provisionally. 



In a general way this species is rather close to the preceding, 

 but is smaller, the thoracic M more completely represented, the 

 elytral punctures coarser, less numerous and less confused. The 

 frontal spots are unusually heavy for a yellow species. In two 

 examples small faint standard spots are evident on the elytra. 



32. Pachybrachys coloradensis Bowditch 



Small, pale whitish or grayish yellow, brown punctate, elytra 

 fairly regularly punctate striate, head and prothorax polished, 

 elytra a little less shining but not visibly alutaceous; eyes widely 

 distant; ocular lines distinct but fine; front claws of male not 

 enlarged. Ave. length 2.3 mm. Hocky ]\Iountains, Montana to 

 Arizona. 



Head rather large, front feebly convex, the standard markings nearly 

 obsolete, or at most represented by a narrow median line and an ill-defined 

 spot on the vertex; punctuation not close; ocular lines fine, not or scarcely 

 impressed inferiorly. Eyes small, distant by more than their own length in 

 both sexes, a little more widely in the female as usual. Antennae moderate, 

 blackish in outer half, attaining the hind coxae in the male. 



Prothorax with moderately close nearly evenly diffused rather coarse punc- 

 tures, side margins narrowly smoother, spots entirely wanting or small and 

 faint. 



Elytra with finely imi)ressed striae, which are fairly distinct throughout 

 except in a moderate sized baso-sutural triangle, where they are confused; 

 shield wanting; marginal interspace with a few punctiu'es at base. 



Pygidium entirely yellow or with the base very narrowly black, bod^- be- 

 neath blackish with the usual ptde margins. Legs pale, with small brownish 

 spots on the thighs. 



Length 2 to 2.65 mm.; width 1 to 1.35. 



Distribution. — Colorado: Cok)ra(lo Springs, .Tune 15 to 30, type (Coll. by 

 Wickham). A'ew Mexico: Coolidge (VVickhamJ. Arizona: Winslow, July 

 31 (Barber & Schwarz). Utah: Salt Lake, July 4 (Hubbard & Schwarz); 

 Clear Lake (Wickham); Sevier Lake (type sevier Bowd. — Bowditch Coll.). 

 Montana: Without definite locality (Leng Coll.). Wyoming: Green River 

 (Bowditch Coll. as sevier). 



