250 [Deacmbor, 



the point of junction of the two forming a rery widely open angle ; antennae short, 

 compact, 3rd joint sub-cylindrical or slightly obconical, joints 4 — 8 sub-equal, sub- 

 moniliform, 9 a little larger aud sub-obconical, 10 longer than 9, cylindrical, trun- 

 cated at apex, 11 very short, transversely conical (or triangular), apex pointed ; 

 head imbedded in the prothorax iip to the hind margin of the eyes, less gradually 

 sloping in front than in P. asidioides, very finely tuberculated (the tubercles nearly 

 •hidden by the incrustation above mentioned) ; prothorax of the same form as in 

 F. asidioides, the aiaterior angles distinct, finely tubercidated in the middle, much 

 more strongly on the sides ; elytra oblong-oval, squarely truncated aud scarcely 

 wider at the base than the base of the prothorax, humeral angles indistinct, rcgidarly 

 convex {i. e., not perceptibly depressed on the back), the epipleurse rounded {i. e., 

 not marked off from the sides by a keel-like costa), abruptly declivous behind, 

 entirely and more or less strongly covered with irregidar, transverse flexuous eleva- 

 tions, which ai'e much broken up, giving an irregidarly nodose or tubercidated appear- 

 ance, the spaces between these elevations appearing irregularly foveated or slightly 

 rimose ; there are also apparent on each elytra four slightly elevated, interrupted 

 costffi ; situate on the top of these elevations (Ijut more especially on those forming 

 the costffi) are clusters of small, black, conical tubercles, and from each of these, as 

 well as from those on the head and prothorax, arises a strong, pitchy, bristle-like 

 hair, directed backwards ; legs comparatively short, pubescent, bristly ; anterior 

 tibisB slightly more triangular than in P. asidioides, the apex at the outer side 

 sub-dentiform, the spurs very long and stout; the four hind tibiae quadrangxdar ; 

 prosternal process more prominent than in P. asidioides, the mesosternum sub- 

 horizontal and abutting to the prosternal process ; epipleural fold somewhat broader 

 behind than in P. asidioides ; tarsi short, robust, the joints contracted. 



Long. 5 1 lin. 

 Sab. : Niger ; one example. 



Taking the typical species, Folpogenia appears to differ from 

 Fterolasia in having the mentum much broader, sub-angular at the 

 sides, and strongly angularly notched in front ; the labrum larger, 

 more prominent, emarginate in front and without the transverse 

 elevated line near the anterior border ; the anterior angle of the pro- 

 thorax distinct ; the anterior tibiae basally more robust, the outer 

 apical angle more dentiform and the spurs longer and more robust ; 

 the prosternal process narrower, less expanded near the mesosternum, 

 and curved round the coxae ; the outer joints (especially) of the 

 antenna? differently formed ; and the antennary orbits less prominent, 

 less distinctly marked off from the epistoma and appearing almost 

 continuous willi it. The figures given by Solier (Tome 5, pi. iii, 

 D, 17, and pi. iv. A, 4) are incorrect in this latter respect. In Ptero-^ 

 lasia it will be found — when the head is looked at from the front — 

 that the antennary orbits are prominent and abruptly rounded in 

 front, so that the angle formed at the point of junction with the 

 epistoma is considerably less open than in Folpogenia. 



