334 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



fiavo-testaceoiis, frontal and thoracic markings black and heavy as a rule, the 

 latter varying to pale brown; antennae with basal two joints blackish above, 

 three to five mostly pale, following joints blackish; body beneath frequently 

 blackish in great part, but variable: elytra varying from entirely pale to 

 strongly marked with fuscous or black, the markings tending to form diffuse 

 vittae following the lines of serial punctures; interstitial punctuation of ehi:ra 

 somewhat finer and less dense than in xanti. 



Length 2.9 to 4.2 mm.; width 1.6 to 2.5 mm. 



Distribution. — Texas: El Paso, June 7 (Knaus); Davis Mts., Julj- 7 to 10 

 (Wenzel). Colorado: one example without definite locality (C. F. Baker). 

 A'etr Mexico: Alamogordo, Apr. 23, May 10, (Viereck). Arizona: Riverside 

 (Wickham); Globe (Wickham); Ncgales, Aug. 10 to 13 (Wickham); Phoenix, 

 May 16; Hot Springs, June 2S (Barber & Schwarz). 



12. Paehybrachys donneri Crotch 



Black, opaque, side margins of prothorax, basal raised margin 

 of elytra also side margins for a variable distance from the base, 

 yellow; lustre throughout alutaceous; pubescence gray, decum- 

 bent, rather plentiful; disk of elytra and prothorax sometimes 

 feebly and indefinitely irrorate with dull j^ellow. Ave. length 

 4.5 mm. California and Washington. 



Head black, often with small yellow markings, thickh- punctate, feebly 

 impressed. Eyes in male separated by a little less than three times the length 

 of the basal antennal joint, or by a little less than their own vertical length; 

 in the female by about three and one-half times the length of the basal joint, 

 or rather more than their own vertical length. Antennae attaining the humeri 

 in the female, considerably longer in the male, more or less pale basally, black 

 beyond the middle. 



Prothorax moderate^ transverse, widest at base, sides arcuate, very slightly 

 sinuate before the hind angles; rather densely moderately coarsely punctate 

 with intermixed finer punctures; no trace of smooth median line; yellow side 

 margin more sparsely punctate. 



Elytra abruptly a little wider than the prothorax, one-fourth longer than 

 wide, sides feeblj' sinuate, punctures for the most part irregularh' dispersed 

 but with some nearly regular series especially at sides; interstitial punctures 

 very fine but moderately numerous. 



Pygidimn black, the sides sometimes narrowly yellow. Legs entirely black 

 or with the tips of the thighs pale. 



Length 3.75 to 4.9 mm.; width 2 to 2.6 mm. 



Distribution. — California: East end of Donner Lake on willows (type, 

 Crotch); Yreka; Santa Rosa (Ricksecker) ; Blair's Ranch, Redwood Creek, 

 Humboldt Co., June 9 (H. S. Barber); Sonoma Co. (Van Dyke). Washing- 

 ion: Olympia, May 20 (Liebeck Coll.). 



