340 AMERICAN PACHYBRACHYS (cOLEOPTERA) 



Prothorax not strongly transverse, sides broadly arcuately convergent from 

 near the base, punctuation close and nearly uniformly dispersed, side margins 

 narrowly smooth. 



Elytra a Uttle less than twice as long as the prothorax, rather finely confusedly 

 punctate or with subregular close set short lines of punctures between the base 

 and the conspicuous elytral shield; externally with a variable nimiber of un- 

 impressed striae, marginal interspace usually with a few punctures near the 

 base, more rarely extending to or behind the middle. Pygidiimi yellow, 

 scarcely maculate basally. 



Body beneath browai or fuscous except the side and apical abdominal mar- 

 gins. Legs pale, femora with diffuse brown median spot, tibiae feebly brown- 

 ish apically. 



Length 2.3 to 3.3 mm.; width 1.35 to 1.8 mm. 



Distribution. — Texas: Lee Co. (Leng Coll.); Dimmit Co. (Hubbard & 

 Schwarz); "Tex" (Horn Coll.); San Diego, May 6 and June 13; Corpus Christi; 

 Brownsville, May and June (Nat. Mus. Coll.); Brownsville, July (Beyer), 

 July 28 (Schaeffer). New Mexico: Colorado, July 10 (Cockerell). Arizona: 

 Santa Rita Mts., 5C00-S000 ft., July (Snow); San Bernardino Ranch, Cochise 

 Co., 3750 ft. (Snow and E. G. Smyth); Nogales, 4000 ft., Aug. 19 (Xunen- 

 macher); Chiricahua Mts., June 1 (Nat. Mus. Coll.); Florence (Horn Coll.), 

 May 8, and Aug. 10 (Am. Ent. Soc. Coll.); Tucson (Liebeck Coll.). 



This appears to be a common species along om- southern border. 

 It has been identified a,s inuuacidatus by Bowditch, doubtless 

 from comparison with authentic examples, and the description 

 seems to fit well enough. It was described from near the City 

 of Mexico (H. H. Smith) and from La Paroda (Salle). 



21. Pachybrachys insidiosus new species. 



Pale grayish yellow, feebly and obscurely maculate with brown ; 

 thickly rather finely almost entirely confusedly brown punctate, 

 integuments very finely alutaceous; eyes widely separated; front 

 with ocular lines; front claws of male not appreciably enlarged. 

 Length 2.9 mm. Arizona. 



Head thickly nearly uniformly punctate, markings obsolete. Eyes separated 

 in the male by a distance almost as great as their vertical length, or by about 

 three times the length of the basal antennal joint; in the female by a distance 

 somewhat greater than their vertical length or by about three and one-half 

 times the length of the basal antennal joint. Antennae dusky, paler basally, 

 scarcely haK the length of the body in either sex, tenth joint but little more 

 than twice as long as wide. 



Prothorax moderately transverse, sides broadly arcuate and moderately 

 convergent from near the base; puncluatiou close, nearly evenly distributed, 

 narrowly sparser along the side margins, the latter smooth for a short distance 

 basally, the M vaguely represented by brownish clouds. 



Elytral punctuation diffuse, with only a few short fragments of unimi)ressed 



