NORTH amf:rican coleoptera. 235 



iiKxlerately deeply inipre^^ed. Last segment irregularly concave 

 with sniail granulations, the anterior margin distinctly elevated. 

 Inner spur of hind tibia long, slender and acute, extended in the 

 axis of the tibia ; outer spur longer, slender and acute. 



Female. — Antennal club shorter than the funiculus. Last ven- 

 tral segment broadly and moderately deeply emarginate, the disc of 

 segment with an abrupt triangular or oval impression. Posterior 

 tarsi distinctly shorter than in the male. 



Variations. — The pruinosity is easily removed from the surface 

 by immersion in alcohol or from other causes, and the specimens 

 have then quite a different apjiearance from the others. These are 

 very difficult to determine, except from the male. The thoracic 

 punctuation is normally close and regular, but specimens occur with 

 a decided irregularity in the punctuation. 



The sexual characters ofprunina and affinis are practically identi- 

 cal. It is therefore difficult to so describe the nou-pruinose speci- 

 mens of the former that they may be separated from the latter. 

 In prunina the form is shorter and more robust, the elytral costse 

 fairly distinct, the punctuation fine, sparse and indistinct. 



With this species I am inclined to unite that described by Bur- 

 meister as fraterna. The description certainly does not apply to that 

 species, while it seems quite close enough to be applied to a prunina 

 deprived of pruinosity. 



Occurs from Ohio and Michigan to Kansas, Texas and Alabama. 



Group VIII, calceata. 



Clypeus moderately deeply emarginate, the border reflexed. Last 

 joint of maxillary palpi fusiform, flattened externally. Antennae 

 "lO-)ointed. Posterior tibi?e with the inner spur fixed in the male. 

 First joint of posterior tarsus very short, not longer than half the 

 second, the apex abruptly dilated and prolonged in a process exter- 

 nally in both sexes, although more distinctly in the male. Claws 

 curved, the tooth median, longer in the female. Posterior tar.si 9 

 shorter. 



At the time this species was described Dr. LeConte suggested that 

 it should probably form a distinct group. The female was then un- 

 known, and he was unable to assign characters connnon to the two 



sexes. 



The form of the hind femur of the male is known in but one other, 

 veheniens, a species allied to J'usca. 



