THE CANADIAN ENTOMOLOGIST. 271 



the basal depressions of the elytra and throughout the wider surface. 

 Antennse slightly longer than the vertical diameter of the eye, serrate from 

 the fourth joint, outer joints transverse. Head coarsely punctate, feebly 

 concave, with fine median impressed line ; front with a shallow rounded 

 impression each side the median line. Prothorax wider than long, sides 

 as viewed from above straight and parallel in basal half, then narrowed 

 and nearly straight to apex ; anterior margin broadly arcuate at middle, 

 hind margin deeply sinuate each side, the median lobe truncate and a 

 little emarginate; surface uniformly feebly convex, without cost^e or depres- 

 sion except the carinas of the hind angles, which are well defined and 

 nearly half the length of the thorax ; punctuation similar to that of the 

 head, and not forming rugae or strigte. Scuiellum not carinate. Elytra 

 parallel, sides moderately sinuate at middle, surface evenly convex except 

 for the basal depressions, rather finely imbricate, apices separately rounded 

 and minutely serrulate ; pygidium not carinate. Body beneath with dark 

 greenish lustre, except the legs, which are bronzed ; pubescence more 

 abundant than above, and with the dense efflorescence nearly concealing 

 the surface ; prosternum broadly arcuato-lruncate in front, the intercoxal 

 process broad and subtruncate at tip; first ventral suture visible from side 

 to side, margin of last ventral not distinctly serrate. Front tibiae arcuate, 

 inner apical angle mucronate ; middle tibiae slightly arcuate, and with a 

 small mucro at tip ; hind tibia^ straight, simple ; c\a.ws with a moderate 

 tooth, which is not inflexed, and is a little longer in the anterior pair. 



Length, 9.5 mm.; width, 3 mm, 



Arizona, " Bill WiUiams Fork" (Snow). 



The type is a male, judging from the arcuate and mucronate tibiae, 

 but there are no prosternnl or ventral characters to support this view. 

 The very broad form gives it a facies entirely different from any of the 

 known species of our fauna, nor is there anything like it in the "Biologia," 

 as I am informed by iMr. Blanchard, who kindly investigated this point for 

 me. By Horn's table the present species would be associated with Wal- 

 singhami a.\\dpt(Ickeila, in which the first ventral suture is better developed 

 than elsewhere. Notwithstanding the decidedly out?e appearance of 

 Stiowi, there appear to be no grounds for generic separation. It may be 

 noted that the submarginal carina of the protharacic flanks is more nearly 

 parallel to the margin tlian in any other species known to me. 



