H. C. FALL 353 



one and three-fifths (6^) or three ( $ ) tunes the length of the basal antcnnal 

 joint. 



Proihorax strongly transverse, in the female almost twice as wide as long, 

 not much narrowed in front in the male, the sides very broadly subangulate 

 behind the middle; in the female straighter and a little more convergent; sur- 

 face unevenly punctured, the paler areas smooth or much more sparsely punc- 

 tured, side margins rather broadly smooth. 



Elytra fully two and one-half times as long as the prothorax, striae lightly 

 impressed, four to six more or less contorted or broken at middle, the others 

 fairh' regular; punctures confused in a narrow baso-sutural region; submarginal 

 stria with sigmoid dislocation near base, marginal interspace without punctures; 

 shield distinct. 



Body beneath brown with usual pale margins; legs pale, thighs sometimes 

 with faint median clouds. Front claws of male not apj^rcciably enlarged. 



Length 2.75 to 3. .5 mm.; width 1.5 to 1.85 mm. 



Distribution. — New Mexico: Jemez Springs (type d^); Las Vegas Hot 

 Springs, Aug. 2 to 10 (Barber & Schwarz); near Las Vegas Hot Springs, 7000 

 ft., July (Snow). Arizona: (Morrison — in Xat. Mus. Coll.); -'Ari" (Liebeck 

 Coll). 



36. Pachybrachys tacitus new species 



Very closety related to petroni us, the description of which applies 

 except as follows. The prothorax is a little less transverse, the 

 sides a trifle more rounded, the markings less complete and less 

 sharply dejfined, the elytral striae a little coarser and more im- 

 pressed, the sutiiral region not darker, but with a tendency in 

 some specimens toward the development of lateral spots. 



Distribution. — Arizona: Miller Caiion, Huachuca Mts., (Wenzel) tj'pe 

 cf , also taken in these mountains bj' Beyer and Schaeffer; Santa Rita 

 Mts., 5,000 to 8,000 ft. (Snow); Chiricahua Mts., June 1. (Hubbard & 

 Schwarz); Nogales, Sept. 6. (Nunenmacher); "Ari " (Am. Ent. Soc. Coll.). 



37. Pachybrachys abdominalis Say 



Cylindrical, convex, pale yellow, minutely alutaceous, not or 

 feebly shining, punctures pale brown to blackish, arranged in 

 fairly regular feebly or scarcely impressed striae on the elytra 

 except in the scutellar region; cephalic and prothoracic spots 

 small or subobsolete; ocular lines distinct, well removed from the 

 eye on the front; front claws of male distinctly larger than the 

 others. Ave. length 3.5 mm. Manitoba to Texas. 



Head unevenly, sparsely to moderately closely punctate; frontal spots small, 

 vertex spot small, faint, often nearly or quite wanting. Eyes separated by 

 slightly less than twice the length of the basal antennal joint in the male, and 

 by about two and three-fourths times the length of this joint in the female. 



TRANS. AM, ENT. SOC, XLI. 



