176 MEMOIRS ON THE COLEOPTERA 



long, the intervals slightly convex and extremely opaque; humeri 

 not denticulate; hind tarsi nearly as in the preceding species. 

 Length (cf 9 ) 10.5-12.3 mm.; width 4.3-5.2 mm. Texas (Gal- 

 veston) to District of Columbia peropacus n. sp. 



9 Form oblong-oval, moderately stout, very convex, deep black, 

 somewhat piceous beneath, the legs black; antennae slender, nearly 

 black, the first joint pale, the second dusky, testaceous; upper 

 surface (cf) feebly shining, or ( 9 ) with the elytra densely sericeo- 

 opaque; head slightly more than half as wide as the prothorax, the 

 eyes well developed and prominent, the foveae moderately small, 

 deep, somewhat irregular; prothorax one-half wider than long, sub- 

 parallel, the feebly arcuate sides more rounded and converging at 

 apex, which is deeply sinuate and three-fourths as wide as the base, 

 the latter very faintly sinuate from side to side, the angles right and 

 evidently though not broadly rounded; surface wholly impunctate, 

 rather convex, shining, opaculate at the sides and latero-basally, 

 rather strongly but not abruptly declivous laterally, gradually 

 feebly and more broadly so basally, the marginal bead moderately 

 and abruptly elevated; stria very fine, the foveae rather long and 

 narrow but very feeble, impunctate; elytra oblong-oval, with evi- 

 dently rounded sides, one-half longer than wide, barely perceptibly 

 wider than the prothorax, the sides rather rapidly rounding and 

 ogival behind, the oblique sinus long and very feeble; striae fine, 

 the scutellar long and deep, the intervals flat or nearly so, the third 

 with three or four punctures behind the middle, the fifth and seventh 

 with the usual apical series; abdomen very shining, with a small 

 patch of very fine punctures behind the inner part of each coxa; 

 basal joint of the hind tarsi almost as long as the next three com- 

 bined. Length (cf 9 ) 12.0-12.5 mm.; width 5.0-5.4 mm. Arizona 

 (probably southern). Six examples convexus n. sp. 



10 Form oblong-oval, not very convex and moderately shining through- 

 out, deep black; legs black, the tarsi slightly piceous; antennae 

 slender, dark brown, the two basal joints and the palpi testaceous; 

 head slightly more than half as wide as the prothorax, with rather 

 small, moderately convex eyes and minute rounded perforato- 

 punctiform foveae; prothorax with very evenly and distinctly arcuate 

 sides from base to apex, with abruptly elevated bead, the apex 

 deeply sinuate and barely more than two-thirds as wide as the 

 base, which is broadly and feebly sinuate medially, feebly posteriorly 

 oblique laterally, the angles right and broadly rounded; surface 

 not much duller laterally or basally, steeply declivous anteriorly 

 to the fine re flexed edge, the latter rapidly broader, abruptly flat 

 and with a few feeble punctules posteriorly, not abruptly but 

 gradually flattened basally, the foveae broad and feeble but distinct, 

 impunctate though slightly rugulose and separated from the lateral 

 flattening by the prolonged convexity of the general surface, the 

 stria very fine; elytra equal in width to the prothorax, almost 

 one-half longer than wide, the sides gradually rounding and con- 

 verging behind the middle to the acutely ogival apex, the sinus very 

 feeble; striae fine but deep, the scutellar long, the intervals feebly 



