June, I9II.] Schaeffer: New Coleoptera. 117 



middle. In rufipcs there is a more or less distinct, longitudinal im- 

 pressed line near lateral margin which is absent in nigra. 

 Pocadius basalis, new species. 



Piceous, elytra with a red, somewhat triangular basal space, underside 

 ferruginous, legs and antennae paler. Head coarsely punctured. Prothorax 

 about twice as wide as long ; sides moderately arcuate ; lateral margin feebly 

 explanate ; hind angles oblique ; disc rather coarsely but not very densely punc- 

 tured. Elytral rows of punctures confused near suture, more distinct at sides. 

 Presternum, seen from the side, plane not deflected at apex. Mesosternum 

 subcarinate at middle. Metasternum coarsely punctate. The first few seg- 

 ments less coarsely punctate than the last. Length 4 mm. 



Huachuca Mts., Arizona. 



This species looks very much like fulznpcnnis but has the pro- 

 sternum differently formed, the sides of the thorax feebly explanate 

 and the punctuation of elytra confused. 



The prosternum, viewed laterally, is relatively strongly arcuate in 

 fidvipcnnis, less so in helvolus but plane in basalis. 



Table of the Species of Pocadius. 



1. Prosternmn, viewed laterally, plane not deflexed behind the coxs ; meso- 



sternum longitudinally carinate at middle; sides of thorax slightly more 

 reflexed than in helvolus but less so than in fulvipennis ; color piceous, 



elytra with a red basal spot of variable size basalis n. sp. 



Prosternum at apex more or less deflexed 2 



2. Prosternum feebly deflexed behind the coxas, mesosternum longitudinally 



acute at middle : sides of thorax and elytra feebly reflexed ; color rufo- 



testaceous helvolus Er. 



Prosternum strongly declivous behind the coxje ; mesosternum plain, not 

 acute at middle; sides of thorax and elytra rather strongly reflexed; 

 color variable, from rufo-testaceous to black, elytra with large, rufous 



basal space fulvipennis Er. 



Psilopyga nigripennis Lee, New Species, 1863, p. 64. 



Dr. Horn suggested that this might prove to be a variety of 

 histrina. The characters separating the two are too numerous to 

 admit such a course. Besides those given -in the following table of 

 our species the prosternum in nigripennis is more convex, the third 

 and fifth antennal joints are relatively longer and the metasternum 

 and abdomen are much more sparsely punctate than in histrina. 



T.-VBLE OF THE Species OF PsHopyga. 

 I. Head and prothorax, the latter especially near margin with fine and coarse 

 punctures intermixed ; prosternum uniformly, rather coarsely punctate 



