H. C. FALL 357 



a paler grayish yellow, the markings black or fuscous and more 

 or less conspicuously developed, the pygidium in great part black, 

 rarely as much yellow as black; the upper surface often distinctly 

 shining and sometimes even polished, with faint traces of aluta- 

 ceous sculpture; eyes more distant, as a rule separated in the 

 male by twice the length of the basal antennal joint. These 

 characters — or in fact almost any one of them — will suffice in the 

 vast majority of cases to distinguish the two species, but it must 

 be said that occasionally one or another fails and in rare in- 

 stances about all of them do, and then — especially when dealing 

 with single specimens — the experience and judgment of the stu- 

 dent can alone decide. 



39. Pachybrachys pusillus Bowditch 



Cylindrical, convex, dull yellow, surface minutely alutaceous 

 and feebly shining, punctures pale brown, spots almost wanting, 

 el^'tra subregularly striate, ocular lines fine but traceable, front 

 claws of male scarcely perceptibly enlarged. Ave. length 2.6 

 mm. Texas and Arizona. 



Head rather sparsely irregularlj- punctate; eyes separated in the male by a 

 distance subequal to the length of the first two antennal joints or by distinctly 

 less than the vertical width of the upper lobe of the eye; in the female by nearly 

 twice the length of the basal joint or by a distance equal to or slightly greater 

 than the vertical width of the upper lobe. Antennae short, barely reaching 

 the hind coxae in the male, outer joints dusky at their tips. 



Prothorax rather large, moderately transverse, sides arcuate and moderately 

 convergent toward the front; punctuation somewhat uneven, moderately 

 close, side margins smooth, the M faintly or scarcely indicated in slightly 

 darker tint. 



Elytra without markings; striae a little impressed, subregular except in the 

 scutellar region, the fifth and sixth often broken at middle, the eighth some- 

 times interrupted, sometimes merelj' sinuate behind the humerus; marginal 

 interspace devoid of punctures; shield distinct. 



Pygidium pale yellow, the spots small and faint, or subobsolete. Body 

 beneath a little darker in color, the metasternum reddish brown. 



Length 2.2 to 3 mm.; width 1.2 to 1.6 mm. 



Distribution. — Texas: Brownsville (type) and San Antonio (in Bowditch 

 Collection); Brownsville, May 24 (H. S. Barber in Nat. IMus. Coll.), July 23 

 (Wolcott), June (Snow), Aug. (Beyer), Apr. and May (Dury), June and July 

 (Schaeffer); San Antonio (Wickham); Macdona, July 28 (Wenzel); New 

 Braunfels, Aug. 9 (Schwarz); Uvalde, 930 ft., June 18 to 20 (Wickham); 

 S. W. Tex. (Am. Ent. Soc. Coll.); Tex. (Leng Coll.). Arizona: San Bernardino 

 Ranch, Cochise Co., 3,750 ft. (Snow). 



TRANS. AM. ENT. SOC, XLI. 



