NORTH AMERICAN COLEOPTERA. 285 



rounded, disc coarsely sparsely punctate, punctures indistinct near tlie hind an- 

 gles, a few scattered hairs near the sides. Elytral punctures coarse and sparsely 

 placed, the surface without trace of costae, the sutural costa being entirely ob- 

 literated, margin with short ciliic Metasternum moderately densely punctured, 

 the hairs rather dense, long and yellowish-white. Abdomen sparsely punctate, 

 with short hairs. Claws % feebly arcuate, the tooth small and close to the base. 

 Last joint of maxillary palpi fusiform, obtuse, not impressed. Length .62 inch ; 

 16 ram. 



IVIale. — Club of antemiiv one-third longer than the stem. Ab- 

 domen absolutely simple. 



Of this sj^ecies I have seen but one specimen remarkable in hav- 

 ing the hind angles of the thorax rounded and the sutural (!osta of 

 the elytra entirely obliterated. When recent the surface is probably 

 .slightly ])ruinose or sericeous, but the specimen has been collected in 

 alcohol, and this often removes the pruinosity and makes the sericeous 

 appearance dull and subopaque. 



Occurs in southwestern Texas. 



Group XVI, tristis. 



This group contains three species of oblong or slightly oval form 

 with the following peculiarities : The head is sniall, clypeus entire 

 (fig. 2) and rather deeply concave, coarctate at base, not extending 

 to form a part of the canthus of the eye ; upper surface of body 

 hairy, the hairs erect on the head and thorax and at the base of the 

 elytra ; thorax feebly crenate in leut-i only ; elytra with feeble discal 

 costse; pectus with moderately long hair; antennfe 10-jointed, the 

 joints often very indistinct ; anterior tibia? normally toothed ; spurs 

 of posterior tibiae free in both sexes ; the tarsal claws have a rather 

 small tooth ; always intramedian in the male, longer in the female ; 

 the posterior tarsi of the female of eriiiita are notably shorter than 

 the male. 



The following table will aid in the idontiiication of the species : 



Elytra with little or no pubescence, surface gl:i])rous; anteunal club % nuich 



longer than the entire stem 75. criiiitit. 



Elytra hairy ; anteunal club not longer than the .stem. 



Above abundantly hairy, the surface shining 76. tristis. 



Above spar-sely finely hairy on the elytra, the surface distinctly pruino.se. 



77. loiiis. 



Of these species /r/,sf/.s is widely distributed, /f«/.s south (,'alifornia 

 and Arizona, criiiitd Texas and Mexico. 



