660 ColeojJterological Notices, IV. 



Oomorphidius is distinguished by an oval, extremely convex and 

 subglabrous body, rather long, moderately stout, arcuate beak, with 

 broadly arcuate and somewhat advanced epistomal lobe, rather 

 robust legs, with subarcuate femora, dilated third tarsal joint and 

 very small, slender, free and divergent claws. The scutellum is 

 minute. The two species differ subgenerically as follows : — 



Subgenus I. 

 Apical constriction of the protliorax not extending across the dorsal surface ; 

 prosternura narrowly and feebly sulcata, the sulcus squamosa along its 

 edges ; anterior coxae apparently separated by less than one-third of their 

 own width; elytra without dispersed squamules ; scutellum nearly as 

 wide as long ; size larger, the elytra nearly as in Eisonyx and wider tlian 

 the protliorax 1 erasus 



Subgenus II. 

 Apical constriction in the form of a deep abrupt groove, extending without 

 change in character entirely across the dorsal surface ; prosternum very 

 broadly, moderately strongly subsulcate, the sides of the impression not 

 well defined and completely glabrous; coxae separated by one-half of their 

 own width ; elytra with a few widely dispersed squamules toward the 

 sides and apex ; scutellum elongate, triangular ; size small, the protliorax 

 much shorter and equal in width to the basal parts of the elytra. 



2 laevicollis 



1 Oomorphidius erasus Lee. — Trans. Am. Ent. Soc, VIII, p. 217 

 (Microcholus). 



Oval, very strongly convex, black, the legs slightly piceous, the 

 antenna3 rufescent ; integuments smooth, almost completel}' gla- 

 brous and very highly polished, the elytra slightly alutaceous. 

 Head minutely, sparsely punctulate, the transverse impression broad 

 and feeble ; beak rather long and somewhat stout, distinctly, evenly 

 arcuate, sparsely, deeply punctate and fully as long as the head and 

 prothorax; antennae inserted just behind the middle, the scape long, 

 first funicular joint as long as the next three, the second one-half as 

 long as the first and fully as long as the third and fourth com- 

 bined ; club robust, moderate in size, abrupt, densely pubescent. 

 Prothorax nearly one-half wider than long, the sides rather strongly 

 convergent and nearly straight to apical third, then gradually 

 rounded and convergent to the strongly tubulate apex ; base 

 broadly, evenly arcuate throughout the width, the lobe obsolete ; 

 disk sparsely, extremely minutely and feebly punctate throughout 



