35O MEMOIRS ON THE COLEOPTERA 



Body shining, black; prothorax not wider than long, not at all narrowed 

 at apex, which is scarcely emarginate, very much narrowed behind, 

 where it is only half as wide as at apex, moderately rounded on 

 the sides, sinuate posteriorly; angles acute, prominent; interior basal 

 impression long, the exterior extremely short, almost obsolete; car- 

 ina obsolete; anterior transverse line and impression wanting. 

 Length 10.7 mm. Georgia (Nakutshi, Habersham Co.). 



vinctus Lee. 



These two species seem to differ considerably in the form of the 

 prothorax, especially at apex and about the hind angles, and vinctus 

 is somewhat the smaller in size. 



Megasteropus n. gen. 







A single very large species, one of the largest of our Pterosti- 

 chinae, alone constitutes this genus as far as known. It is character- 

 ized by a notably large head, with well developed mandibles and 

 very deep superciliary groove, convex and deeply constricted pro- 

 thorax, with very much deflexed apical angles and total absence of 

 normal punctuation of the elytral striae. I at first thought that 

 Feronia heros Say, might also enter the genus, but, as shown below, 

 this is highly improbable. The type may be described as follows: 



Body very large, stout, strongly convex, deep black, shining, the elytra 

 barely less so even in the female; head large, the eyes rather prom- 

 inent; sulci very coarse and deep, parallel; antennae (9 ) thick bas- 

 ally, only a fourth longer than the head: mandibles striate only 

 anteriorly; prothorax with transverse ruguliform lines, fully one- 

 half wider than long, equally wide at base and apex, the sides thickly 

 but not broadly margined, strongly, subevenly rounded, very rap- 

 idly oblique posteriorly to the deep stricture, thence strongly diverg- 

 ing to the slightly blunt but prominent angles; apex strongly sinu- 

 ate, the margination flat and well denned by an incised line; stria 

 fine, deep, broadly impressed, much abbreviated at base, which is 

 transverse and three-fourths the maximum width; anterior trans- 

 verse impression obsolete, the posterior rather deep; foveae very 

 deep, smooth at the bottom, the inner line long, the outer short, 

 the carina obtusely prominent; elytra oblong-oval, three-fifths longer 

 than wide, a fourth or fifth wider than the prothorax, deeply im- 

 pressed along the basal margin, the extremely fine and feeble super- 

 ficial striae being merely a succession of short lineiform and barely 

 visible comminution, not having the nature of punctures; lateral 

 series lying along a deep coarse impression, uninterrupted medially. 

 Length (9) 26.0-27.0 mm.; width 8.3-9.7 nim. Texas. Levette 

 collection gigas n. sp. 



This remarkable species I have had for many years under the 



