H. C. FALL 335 



13. Pachybrachys uteanus new species 



Very closely allied to donneri and perhaps merely a geographical race of that 

 species; the eyes, however, are in all specimens seen less widely separated and 

 the thoracic punctuation uniformly finer; the upper surface also more often 

 variegated with yellow. These latter specimens look greatly like the darker 

 examples oihrunneus and really form a good connecting link between donneri 

 and typical brimneus; they are, however, quite surely distinct from the latter. 



DislribuHon : — Utah: American Fork, June 24 (Hubbard & .Schwarz); type 

 cT. New Mexico: Pecos (Cockerell). 



14. Pachybrachys brunneus Bowditch 



Form narrower than ustial in this section, testaceous with pale 

 brown punctures, the thoracic M indicated by faint brownish 

 clouds, which occasionally become fuscous or black and involve 

 the whole disk except narrow side margins; elytra frequently 

 with diffuse shades which, as on the thorax, tend to become 

 darker and spread broadly over the disk; surface finely aluta- 

 ceous, lustre dull, pubescence rather plentiful, short, decumbent. 

 Ave. length 3.6 mm. Texas to Southern California. 



Heail not very thickly punctate, vertex impressed, markings faint to distinct. 

 Eyes (in the male) separated by one and one-half times the length of the basal 

 joint of the antennae or by rather less than the vertical width of their upper 

 lobes; in the female by a little more than twice the length of the basal joint. 

 Antennae thin, attaining the humeri in the female and fully the basal third 

 of the elytra in the male, the outer joints more than twice as long as wide. 



Prothorax subconical, not very strongly transverse, sides convergent from 

 the base, nearly straight in the male, broadly curved in the female, punctua- 

 tion moderately close, not very coarse, with finer punctures intermixed; no 

 trace of smooth median line. 



Elytra a little %vider at base than the prothorax, one-fourth longer than wide, 

 .slightly sinuate behind the humeri and feebly narrowed posteriorly; punctua- 

 tion rather fine and irregular but with the submarginal and usually some discal 

 series more or less well marked, not or scarcely impressed. In some specimens 

 — more often females — two or three narrow discal smooth lines extend from the 

 base backward becoming gradually lost posteriorly. Interstitial punctures 

 fine, moderately numerous, most evident in the darker specimens. 



Body beneath variable from entirely pale to almost completely infuscate. 

 Legs in the darker specimens' broadly dark ringed; front tibiae straight, claws 

 subequal on all feet. 



Length. 3 to 4.25 mm.; width 1.5 to 2.3 mm. 



Distribution. — Arizona: Phoenix and Prescott — type series (Bowditch); 

 Phoenix, June 4 (Wickham Coll.); Bill Williams' Fork, August (Snow); Tucson 

 (Am. Ent. Soc. Coll.); Tucson, Tempo and Verde River (Liebeck Coll.); "Ari" 

 many collections. California: S. E. Desert Region (Am. Ent. Soc. Coll.). 

 New Mexico: N. Mex. (Snow) bearing label xanti. Colorado: (Baker). 

 Texas: Davis Mts. (Wenzel). 



TRANS. AM. ENT. SOC, XLI. 



