154 MEMOIRS ON THE COLEOPTERA 



elytra, very much larger head and more transverse and less ante- 

 riorly narrowed prothorax; it never should have been associated 

 closely with dilatatus . The single example in my collection is from 

 Indiana, and it seems to be rather rare in collections. 



Liodicaelus n. gen. 



This generic name may be suggested for those species now forming 

 part of Diccehis, but differing from the others in having no trace of 

 elytral striation, the elytra having, in the place of striae, unimpressed 

 series of very small punctures. This imparts a decided difference 

 in habitus, though at the same time there appear to be but few 

 other structural differences of prominence, except the shorter an- 

 tennae. The type may be described as follows: 



Liodicaelus evanescens n. sp. Rather stout, oblong-oval and convex, 

 shining but not polished, deep black throughout, without trace of colora- 

 tion; head elongate, smooth, barely half as wide as the prothorax, the 

 impressions feeble; antennae (o 71 ) much shorter than the head and pro- 

 thorax, the outer joints gradually much shorter; prothorax fully a fourth 

 wider than long, the sides parallel, arcuately rounding and converging 

 anteriorly in less than apical half, the deeply sinuate apex less than two- 

 thirds as wide as the base, the latter as in Diccelus: surface feebly aluta- 

 ceous though not sculptured, except in having vestiges of fine transverse 

 and well separated waving lines, moderately convex, rather broadly and 

 strongly reflexed laterally, the edge smooth and rather thick, the anterior 

 impression obsolete, the transverse subbasal one broad and very moder- 

 ate though distinct from the basal angles obliquely and arcuately forward, 

 ending at lateral fourth and basal fifth; there is on each side a deep 

 smooth impression; median stria very fine and feeble; elytra parallel, 

 with nearly straight sides, evenly rounded in about apical third or fourth, 

 wider than the prothorax and nearly one-half longer than wide, convex, 

 shining, perfectly smooth and without sculpture, having regular series 

 of very fine and well separated punctures, varying somewhat in size 

 in the series, the series distinct suturally, becoming completely obsolete 

 externally, the first four or five series easily traceable though gradually 

 fainter, the carina acute and well elevated, extending a little behind basal 

 fourth. Length (o 71 ) 1 8.0 mm.; width 7.5 mm. Arizona (San Bernardino 

 Ranch, Cochise Co.), F. H. Snow. 



Allied apparently to flohri Bates, from San Angel, Mexico, but 

 differing in its rather smaller size, longer humeral carina, more im- 

 pressed and more apically narrowed prothorax and apparently more 

 evident series of elytral punctures; flohri is described as being 

 oblong-elliptic, "niger, vix nitidus," with the prothorax slightly 

 narrowed anteriorly and everywhere smooth, the elytral striae 



