BARILEPTON.—CHRYASUS. 337 
Twelve specimens, varying a good deal in size. These insects agree very nearly 
with an example from Greely sent me by Mr. Wickham (but not so well with a 
co-type sent me by Casey). They are cupreous or eneous in colour (not black, as 
described) ; the vestiture is coarse along the sides of the prothorax and elytra, tending 
to form an indefinite white marginal stripe; the prothorax is slightly constricted in 
front and about as long as broad; the legs are sometimes in great part rufous; the 
rostrum is strongly bent near the base; and the first ventral segment is hollowed 
down the middle in the male. 
CHRYASUS, gen. nov. 
Rostrum stout, arcuate; mandibles short, decussate ; antennal club ovate; prothorax feebly constricted in 
front ; scutellum small, free; elytra a little wider than the prothorax, with rounded humeri; pygidium 
not visible; prosternum unarmed, with an oval or subtriangular excavation, extending backward between 
the cox, sometimes continued forward to the apex; anterior coxe exserted, separated by about half 
their own width ; femora each armed with a slender acute tooth, and also obsoletely denticulate towards 
the base ; tibie sharply unguiculate ; tarsal claws minute, connate at the base; body rhomboid-ovate or 
oblong-rhomboidal, coarsely sculptured, almost bare. 
Type, C. cavernosus. 
Two small forms are included under Chryasus—one (C. cavernosus) with the 
prosternal excavation deep and reaching the apex, the other (C. plagiatus) with the 
excavation shallower and not extending beyond the transverse subapical groove. 
C. cavernosus has somewhat the facies of Desmoglyptus crenatus (Lec.), which, how- 
ever, has a narrow, exposed, vertical pygidium and unarmed femora. 
1. Chryasus cavernosus, sp.n. (Tab. XVII. fig. 22, 3.) 
Oblong-rhomboidal, narrow, dull, the abdomen shining, piceous, the rostrum, antenne, and legs ferruginous, 
almost glabrous. Head closely punctate, transversely depressed between the eyes above, the latter 
strongly transverse; rostrum curved, very stout, a little longer than the prothorax, coarsely, closely 
punctate, shining and more finely punctured in the 9, the antenne inserted at about the middle, the 
antennal club ovate. Prothorax transverse, constricted and narrowed in front; coarsely, confluently 
punctate and subcarinate. Elytra wider than the prothorax, narrowing from the rounded humeri, the 
disc transversely depressed below the base and beyond the middle; with rows of deep, oblong punctures 
piaced in rather broad striz, the interstices alutaceous, flattened, about as wide as the strie. Beneath 
_. coarsely and closely, the ventral segments more finely, punctate, the first segment depressed down the 
middle in the ¢. Prosternum with a smooth, deep, posteriorly-narrowed, median sulcus which extends 
forward to the apex. Femora each with a narrow tooth and obsoletely denticulate thence to the base. 
_ Tibiee curved, strongly unguiculate. 
Length 22, breadth 14 millim. (¢ @.) 
Hab. Nicaracua, Chontales (Janson). 
Two specimens. Recognizable by the coarse sculpture of the upper surface, the 
uneven elytra, with dull, alutaceous interstices, the distinctly curved tibiew, and the 
toothed femora. The punctures on the prothorax are large and confluent. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, September 1908. 2XxX 
