NATURAL SCIENCES OP PHILADELPHIA. 239 



fore, preferred placing the insect in question in the present genus, to multiply- 

 ing unnecessarily the divisions already proposed. 



The body is oval and convex, very similar to Hemiptychus, but the first ventral 

 segment is not excavated for the reception of the hind feet. The metasternum 

 is declivous in front, with the declivous part limited by a transverse line, pre- 

 cisely as in Lasioderma s e rr ic o rn e, (which it resembles in appearance, 

 though larger), except that the line becomes obsolete towards the sides. The 

 anterior and middle coxae are contiguous, as in the species just named. The 

 antenna? are 11-jointed, with the first joint curved and moderately dilated, the 

 second longer and thicker than the third ; 3 8 equal in thickness, the third 

 longer, the others about as loDg as their width ; ninth and tenth large, com- 

 pressed, triangular, ninth as long as the five preceding united, tenth a little 

 longer, eleventh as long as the tenth, and a little narrower, oval, rounded at the 

 tip. The head beneath is as deeply excavated as in L. serricorne; the 

 front is obtusely impressed in the same manner. The tibiae are compressed, 

 with two elevated lines externally ; the tarsi are dilated, with the first joint 

 moderately elongated, the second equal to the third, and the fifth clavated and 

 depressed. The eyes are uniformly convex, moderately granulated, as in La- 

 sioderma, and not at all emarginate. 



1. C. s i m p 1 e x, longius ovale, convexum, nigro-fuscum, pube helva sericeo- 

 pubescens, opacum alutaceum, punctulatum ; thorace medio dense, lateribus 

 parce punctato, brevi antice subtruncato, basi cum lateribus rotundatis, an- 

 gulis posticis nullis, anticis impressis valde deflexis, (lateraliter visis acutis,) 

 elytris thorace triplo longioribus, baud punctatis ; antennis pedibusque testa- 

 ceis. Long. -14 -18. 



Two specimens, collected in Kentucky, by Mr. J. H. Wild. 



HEMIPTYCHUS Lee. 



Synonym. Dorcatoma Zee, Class. Col., 204. 



This new genus completes the passage from the preceding genera to Dorcato- 

 ma, from which it differs by the anterior coxae being contiguous, as'in Lasio- 

 derma; by the prosternum being short, and not prolonged into two processes 

 behind ; the mesosternum being flat, perpendicular and triangular, and the 

 metasternum without medial channel, not produced in front, but straight, with 

 a very small protuberance at the middle between the middle coxae. The eyes 

 are coarsely granulated, not uniformly convex as in Catorama, but compressed 

 longitudinally at tne side, and very feebly emarginated in front. The antennae 

 are 10-jointed, the first joint large auriculate, second much smaller, somewhat 

 dilated, 3 7 narrow, very small, closely united, eighth triangular, as long as 

 the six preceding united, -ninth a little narrower than the eighth, tenth oval, 

 longer than the ninth, and rounded at the tip. ' Palpi with the last joint dilated, 

 truncate. Feet robust, tibiae, compressed, with a deep, longitudinal furrow on 

 the outer surface, tarsi stout. First joint as long as the two following united. 

 First ventral segment excavated for reception of hind feet. Elytra with two 

 submarginal striae, extending from the middle to the tip.* 

 Our species may be distinguished as follows : 



Elytral striae faintly visible at base ; pubescence coarse : 



Body elongate, elytra densely punctured 1. punctatus. 



Body oval, elytra sparsely punctured 2. gravis. 



Body almost rounded, elytra sparsely punctured 3. p u si 11 u s. 



Elytral striae not prolonged in front; pubescence fine : 

 Surface very finely and densely punctulate: 



Stria fine, body broadly oval 4. borealis. 



Striae deep, body elongate oval 5. v entr a li s. 



* Dorcatoma externa Muls. A Rty, TSiediles, 367, probably belongs to this genus. 



1865.] 



