H. C. FALL 341 



striae on the convexity, and with the submarginal striae in part defined; a 

 lateral series of three small faint darker spots, and vague traces of small discal 

 clouds; shield small but distinct. 



Pygidium entirely pale; body beneath brown, the abdomen with pale mar- 

 gins. Legs testaceous, middle and hind thighs with diffuse dark rings. 



Length 2.9 mm.; width 1.75 mm. 



Distribution. — Arizona: Tempe, Mar. 28. The type is a female example 

 sent by Professor Cockerell, and reported as having occurred on date palm. 

 A male from "Ari" is quite surely identical. 



This species is very similar to immaculatus in most respects but 

 the latter rarely shows any traces of elytral spots, the basal 

 antennal joint is larger and there are several well defined unim- 

 pressed lateral striae. In general aspect intsidiosu.s is also not 

 unlike some examples of hepaticus but the resemblance is purely 

 superficial, insidiosus being a perfectly normal Pachybrachys 

 in all essential respects. 

 22. Pachybrachys marginipennis Bowditch 



Yellow, surface finely alutaceous and scarcely or at most only 

 moderately shining; head and prothorax with the standard marks 

 represented by diffuse pale reddish brown clouds, elytra immac- 

 ulate with sutural and lateral edge very narrowly black; ocular 

 lines present, rather close to the eyes; front claws of male rather 

 strongly enlarged. Ave. length 2.75 mm. Southern California. 



Head closely browai punctate, more densely so in the darker areas as usual. 

 Eyes as a rule separated by about one and one-half times the length of the basal 

 antennal joint, and by twice the length of the basal joint in the female. An- 

 tennae long, fully reaching the hind coxae in the. female, and the middle of the 

 abdomen in the male, outer joints dusky or blackish, basal three joints more 

 or less blackish above, pale below. 



Prothorax moderately transverse, sides broadly but somewhat angularly 

 rounded at basal fourth, whence they are slightly arcuate and convergent 

 to the apex, less obviously so to base, with a small sinuation before the sharplj^ 

 defined basal angles; punctuation moderately close, a little uneven in distribu- 

 tion, sparse or narrowly wanting along the side margins. 



Elytra about twice as long as the prothorax, one-third longer th;in wide, 

 parallel sides barely perceptibly sinuate, punctures very nearly equal in size 

 and density to those of the prothorax, largely diffuse but often arranged in 

 lines toward the sides and on the convexity, the marginal inter.space punctate 

 throughout. Pygidium black and yellow. 



Body beneath sometimes entirely yellow, but usually with the metasternum 

 and abdomen in part black. Legs pale throughout or tlie femora and tibiae 

 with diffuse median clouds. 



TRAXS. AM. ENT. SOC, XLI. 



