H. C. FALL 339 



are doul^tless some of the ^Mexican specimens recorded as livens 

 in the Biologia. 



19. Paehybrachys densus Piowditch 



Small, above pale testaceous or dirty yellow, ver}- thickly 

 finely diffusely punctate, scarcely shining; eyes moderatel)^ dis- 

 tant, ocular lines distinct, front claws of male not enlarged. 

 Ave. length 2.1 mm. Arizona and southeastern California. 



Head closely punctate as a rule, but varying considerably, frontal niark.s 

 vague or nearly wanting. Eyes a little more prominent than the front angles 

 of the prothorax, separated in the male by twice, and in the female by two 

 and one-half times the length of the basal antennal joint. Antennae attain- 

 ing the middle of the elytra in the male, about the middle of the humeral lobe 

 in the female, dusky toward the tip. 



Prothorax moderately transverse, very little narrowed in front, sides feebly 

 arcuate to nearly straight, disk without or with at most faint traces of basal 

 marks; punctuation dense, but a little uneven, extending nearly or cjuite to the 

 side margins. 



Elytra more or less densely, diffusely punctate throughout, sometimes with 

 one or two lines of punctures defined at sides, while two or three narrower inter- 

 vals may be traceable on the disk in some examples — usually females. 



Body beneath black except for the side and apical margins. Legs pale, 

 usually with darker clouds at the middle of the femora and tibiae — more often 

 the four posterior ones. 



Length 1.8 to 2. .5 mm; width 1.1 to 1.4.5 mm. 



Distribution. — Arizona: Tucson (Am. Ent. Soc. Coll.), (Liebeck Coll.); 

 Bill Williams Fork (Snow Coll.); also many specimens from "Ariz" in Xat. 

 IMus. Coll. (Morrison), Horn Coll., Leng Coll. etc. A variety (?) in the Xat. 

 jNIus. Coll. (Hubbard & Schwarz) was taken at Catalina Springs, May 7. 

 California: Needles (Wickham). 



An easily recognized species by its small size, dull dingy yellow 

 color and dense diffuse punctuation. 



20. Paehybrachys immaculatus .Jacoby 



Rather robust, pale dull yellow above with brown iMuictures, 

 finely alutaceous, scarcely shining; prothoracic markings pale, 

 diffuse and nearly obsolete; elytra immaculate, rarely with faint 

 traces of standard spots; ocular hnes fine and near the eyes; the 

 latter moderately distant; front claws of male not enlarged. 

 Ave. length 2.8 mm. Texas to Arizona. 



i/c«(/ rather small, moderately closely jmnctato, frontal spots nearly wanting. 

 Eyes not prominent, separated by about two {d') to two and one-half (9) 

 times the length of the basal antennal joint. Antennae pale basally. dusky 

 toward the apex, reaching about the middle of the elytra in the male, some- 

 what shorter in the female. 



TR.\NS. AM. ENT. .SOC, XLI. 



