290 Trans. Acad. Sci. of St. Louis. 



which bear the short, stiff, suberect hairs and others, irregu- 

 lar in size and disposition, which seem to be simply minute 

 nude indentations of the surface of obscure origin ; this 

 sculpture is especially developed in such forms as sculptipen- 

 nis and suhpunctata. The tergites have each an apical or 

 subapical series of small asperate setiferous punctures, the 

 disk generally having in addition some very minute, sparsely 

 scattered punctures except toward base, these latter bear- 

 ing very short, decumbent and peculiarly arcuate hairs, only 

 visible under high power. On the pronotum the two setiger- 

 ous punctures, moderately close-set at basal third or fourth 

 and another, at each side more posterior and near the margin, 

 appear to be constant throughout the genus, and the other 

 very sparse and smaller punctures are generally more closely 

 aggregated in two irregular parallel longitudinal series, and, 

 to some extent, remotely and irregularly scattered toward the 

 sides. The thirty-two species in my cabinet may be con- 

 veniently classified as follows: — 



Antennae gradually incrassate from the fourth or fifth joint to the 

 apex 2 



Antennae with the joints beyond the fourth abruptly wider, forming a 

 a long loose parallel or subparallel club 5 



2_Prothorax but slightly narrower than the base of the elytra. Form 

 stout, rather deprea^jed, polished, pale flavate, the head dark rufo- 

 piceous, the elytra more whitish in color, with the outer apical part 

 narrowly and faintly nubilous with piceous, a faintly piceous cloud also 

 occupying most of the fourth tergite; prothorax slightly darkened 

 along the middle, sometimes inclosing an elongate pale spot in 

 basal half; head, pronotum and elytra wholly devoid of trace of micro- 

 reticulation, the abdomen very obsoletely reticulate; head transverse, 

 with a few coarse punctures at each side, the antennae attaining 

 basal third of the elytra, the fourth joint elongate, as long as the fifth, 

 the tenth as long as wide; prothorax much wider than the head, three- 

 fourths wider than long, rounded at the sides anteriorly, thence feebly 

 narrowed to the broadly rounded basal angles, the base broadly 

 rounded, distinctly refiexed throughout the width, the surface with two 

 transverse pairs of submedial punctures, strongly impressed before and 

 behind the middle of the length; elytra about a fifth wider and nearly 

 one-half longer than the prothorax, the humeri well exposed, the setig- 

 erous punctures sparse and asperate at the sides and toward the 

 external angles, elsewhere with very fine, sparse, nude and irregularly 

 distributed punctuks; abdomen at base slightly narrower than the 

 elytra, at apex distinctly narrower. Male with two short acute pro- 

 cesses at the apex of the sixth tergite, separated by more than two-fifths 



