444 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



Pygidium with typical marks, yellow predominating. Body beneath black- 

 ish, apex and sometimes the sides of the venter more or less yellow. Legs 

 entirely yellow, the tips of the four posterior femora paler, or all the femora 

 may have dark spots or rings, and the tibiae corresponding dark shades beyond 

 the middle. 



Length 2.25 to 2.8 mm.; width 1.2 to 1.45 mm. 



Distribution. — Colorado: Colorado Springs, 6,000 to 7,000 feet, July 20 to 26 

 (Wickham), cotype from Bowditch; Golden, Mount Lookout, 7,700 feet, June 

 26 (Frost); Buena Vista, July 4 (Hubbard & Schwarz). Texas: Chisos 

 Mountains, July 23 (Wenzel). New Mexico: Coolidge (Wickham); Las 

 Cruces, May 15 (Townsend); La Luz Canon, April 18 (A. N. S. P.); Bernalillo 

 Co. (LengCoU.). Arizona: Winslow (Leng. Coll.); Williams, June 30 (Bar- 

 ber & Schwarz); "Ariz" (Wickham). Utah: Milford, July 7 (Wickham). 

 Nevada: Reno (Wickham). California: Los Angeles Co. (Coquillett — Nat. 

 Mus. Coll.), identity doubtful. 



This small species, at least in its typical form, is rather easily 

 recognized by the tabular and diagnostic characters, although in 

 a general way very similar to a number of others — notably 

 alticola, obsoletus, nubiius and mercurialis. The Nevada and 

 Utah specimens look somewhat different, but as all the specimens 

 before me are females and show no definite distinctive characters 

 they would best remain here for the present. The Los Angeles 

 County, California, specimens — two males — look almost exactly 

 like typical laevis, but in one of them the eyes are much too distant 

 and the front is less shining. It may represent a distinct species, 

 and may possil)ly be a variety of mercurialis, which species closely 

 resembles the immaculate forms of laevis, but differs by its more 

 Avidely separated eyes. The resemblance of my Colorado cotype 

 of laevis to St. George, Utah, specimens of 7iubiius is very close, 

 the latter apparently differing only by the appreciably less distant 

 eyes. 



124. Pachybrachys nubiius Bowditch 



Pale yellow, standard spots small, pale brown, sometimes 

 darker and better defined, sometimes nearly or quite wanting; 

 antennae very slender, nearly as long as the body in the male, 

 tenth joint about four times as long as wide; eyes separated in 

 the male by a distance scarcely or barely as great as the vertical 

 width of their upper lobes; front without ocular lines; front claws 

 of male not enlarged. Ave. length 2.9 mm. Arizona; Utah. 



