426 CASEY 



spiniform, and its inner edge is occupied byta very thin flat fin- 

 like semi-membranous keel throughout the length. I therefore 

 regard the t3'pes of both of these species as male, and the differ- 

 ences in the size of the head, elongation of the prothorax and 

 nature of the elytral sculpture will at once distinguish them, 

 although they appear to come from nearly the same locality. 

 The description and measurements of ciiprascens are taken from 

 the male alone, but the female, represented also by a single 

 specimen, does not differ greatly, having the form a trifle 

 stouter, the prothorax more transverse and the head relatively 

 still smaller. The female sexual characters do not seem to be 

 peculiar, as seen in the type of Jlortdontis, the only one in which 

 the female characters are exposed. 



None of the three Central American species of Schcenicus , with 

 posteriorly projecting prosternum, can apparently be included 

 in this genus, as I at first supposed, and they will constitute one 

 or two distinct genera, one of which has been named Hcmasodes 

 on page 378 of this revision. 



Phegoneus n. gen. 



In general facies this genus is very similar to Lobometo^on^ 

 being evenly fusiform and moderately convex, but the pro- 

 sternum is abruptly truncate at the hind margin of the coxte and 

 the mesosternum, although tumid between the cox^e, is wholly 

 devoid of impression on its anterior declivity. It appears to 

 replace Schcemcus in Mexico and Central America. The epi- 

 stoma is produced in a large subangulate lobe, the lateral lobes 

 almost undifferentiated, the mandibles as in Lobomctopon^ the 

 right with a dorsal porrect tooth clasping the retractile labrum, 

 the left without tooth, and they are gradually less punctate 

 toward tip. The eyes are flattened and finely faceted, with very 

 fine and feeble supra-orbital carin^e, the prothorax rounded at 

 the sides, narrowed in front and frequently also toward base, 

 with the apex more or less sinuate and the angles not very prom- 

 inent, although generally not rounded. The scutellum is small 

 and about as long as wide as a rule ; the upper line of the epi- 

 pleurae attains the acute sutural angles and the elytra have well 

 defined series of punctures. The anterior tarsi seem to have 



