114 AMERICAN COLEOPTERA. 



B. confiiiis n. sp. 



Head black, prothorax brown, elytra pale yellowish testaceous, the 

 sutural edge darker except toward the apex, abdomen brownish pice- 

 ous with the tip gradually a little paler, legs and antennas testaceous ; 

 surface rather dull, the abdomen more shining, antennae short, penulti- 

 mate joints rather strongly transverse, second slightly longer than the 

 next two. Front evenly convex, epistomal suture very fine, not dis- 

 tinctly impressed ; surface very finely sparsely punctate. Prothorax 

 a little wider than the head, evidently transverse, sides parallel and 

 broadly arcuate for three-fourths their length, then rather suddenly 

 rounded and sinuately convergent to base, the base angles rounded 

 and indistinct, the apical angles sharply defined and nearly rectangu- 

 lar ; surface minutely sparsely punctate, median line fine, scarcely im- 

 pressed. Elytra at base just visibly wider than the prothorax, two- 

 thirds longer, sides slightly divergent, finely, feebly, not closely punc- 

 tate. Abdomen minutely reticulate but shining, punctuation very fine 

 and remote. Prosternal sutures obliterated, the hypomera wide, but 

 little narrowed in front, at base twice as wide as the length of the coxal 

 fissures, which are completely closed. Length 2.2 mm. 



El Paso, Texas. A single female specimen taken by the 

 writer. 



The mentum is broadly concave, with an indefinite and 

 feeble longitudinal sublinear impression at middle. This 

 species is to be referred to the cordatus group, and differs 

 from basalis by the smaller prothorax, which is sinuately nar- 

 rowed behind, more ample elytra — which are entirely yellow 

 — and differently sculptured mentum. 



APLODERUS Steph. 

 The two following species belong to Casey's Group I., dis- 

 tinguished by the front coxal cavities being very large and 

 extending to within a short distance of the lateral edge of 

 the prothorax. 



A. trinifer n. sp. 



Head and abdomen black, the extreme apex of the latter paler, pro- 

 thorax rufous or castaneus, elytra flavate with the scutellar region and 

 outer apical angles more or less infuscate ; legs and base of antenmu 

 rufo-testaceous, joints 4-11 of the latter piceous or rufo-piceous. Head 

 as wide as the prothorax, eyes moderately large, their length subequal 

 to their distance from the nuchal constriction, tempora posteriorly as 

 prominent as the eyes ; basal joint of antennas about as long as the 

 next three. Prothorax widest and subangularly rounded at about the 



