H. C. FALL 435 



Distribution. — Arizona: Santa Rita Mountains, 5,000-8,000 feet, Jul}- 

 (Snow); June 18 (Hubbard & Schwarz); Huachuca Mountains, July 1 to 17 

 (Wenzel), July (Beyer); Chiricahua Mountains, May 10, June 8 (Hubbard & 

 Schwarz); Ft. Grant, July 19 (Hubbard & Schwarz); WilUams, Flagstaff and 

 Bright Angel, July 1 to 20 (Barber & Schwarz) ; Oak Creek Canon, 6,000 feet 

 (Snow); Pinal Mountains (Wickham). New Mexico: Cloudcroft, two 

 females, one with broadly suffused markings, the other almost entirel}- black. 

 Texas: Green Valley, Chisos Mountains, Brewster County, July 1.5 (\\"enzel). 



This species is larger than its immediate relatives, and rather 

 easily separable by its almost completely confused punctuation 

 without trace of impressed striae except the lateral one. There 

 are in most examples short, slightly raised elytral costae extending 

 back from the basal margin. 

 110. Pachybrachys varicolor Suffrian 



Size large, integuments polished; yellow, thickly irrorate with 

 pale brown to black, punctures confusedly distributed almost 

 throughout, maculation varying from almost wanting, through 

 well defined standard spots, to black variegated with small yel- 

 low .spots and with the margins narrowly yellow; legs yellow; 

 front without ocular lines; front claws of male not appreciably 

 larger. Ave. length 4.25 mm. Colorado to Arizona. 



Head not at all wider than the thoracic apex, yellow with moderate to heavy 

 brown to black standard marks. Eyes separated by one and three-fifths to 

 one and three-fourths times the length of the basal antennal joint in the male, 

 and by about twice the length of the basal joint in the female. Antennae rather 

 long and thin in both se.xes, blackish at base and tip, tenth joint three and one- 

 haff times as long as wide in the male, the joints more nearly filiform in the 

 female, the tenth in consequence nearly four times as long as wide. 



Prothorax moderately narrowed in front, sides more strongly rounded pos- 

 teriorly, slightly incurved at base, punctuation uneven, rather fine, not close, 

 sparser along side margins; M rather diffuse, variable from light to heavy. 



Elytra confusedly punctured, with short fragments of unimpressed striae 

 mainly on the convexity, the submarginal stria more or less irregular but 

 entire, the marginal interspace wide and more or less jmnctate; submarginal 

 interspace narrower and often a Uttle more convex; shield wanting; markings 

 varying from obsolete to heavy, the standard spots sometimes distinct, but 

 more often ill defined or intricately confluent. 



Pygidium black, maculate with yellow, more rarely the great part yellow. 

 Body beneath varying from almost completely yellow to black with the 

 terminal ventral segment yellow at apex. In intermediate forms all the ventral 

 segments are yellow in apical half. Legs j^ellow, terminal joints of tarsi dusky. 



Length 3.5 to 5 mm.; width 1.9 to 2.75 mm. 



TRANS. AM. ENT. SOC, XLI. 



