METACORTHYLUS. 263 
METACORTHYLUS, gen. nov. 
Antennarum funiculus 1-articulatus; clava haud permagna, late obovata, 3-articulata, in pagina interna 
parum concava, pilis longis haud fasciculatis exstructa. Tibiw sublineares, anticee curvate, extus 
scabrose, margine serrato; tarsi longi, postremi tibiis longiores, articulo primo quam sequenti dimidio 
longiore. Corpus cylindricum, elytris ad apicem retusis, integris. 
This genus is established for a single species, represented in our collection by one 
specimen, presumably a female. It approaches Corthylus, but cannot be included in 
that genus nor in the following one, Brachyspartus. The head is not excavate, but 
is flattened slightly in front and furnished with an oval elevated plaque. The 
antennal scape is slender, somewhat clubbed at the apex, but not strongly dilated or 
flattened ; the funiculus is apparently composed of a single nodose joint. The club is 
moderate in size, not relatively larger than in a male Corthylus, flattened, broadish, 
forming almost an equilateral triangle with rounded sides; there are two sutures, 
curved on the outer face, almost straight on the inner face, which is but slightly concave ; 
the apical margin is furnished with a thin fringe of long hairs which are not fasciculate 
but project directly forwards. The anterior tibiz are long, slender and curved, serrate 
for the whole length of the outer edge, and with the outer face scabrous, as in 
Pterocyclon. The middle and posterior tibie are linear and scarcely serrate. The 
tarsi are long and slender, the hinder pair being longer than the tibie; the first joint 
is quite half as long again as either of the succeeding joints. The body resembles that 
of the more cylindrical Corthyli, such as C. excisus (Ferr.). The prothorax is not 
margined at the sides, hind-angles, or base. The elytra are retuse at the apex, and 
are neither emarginate nor divaricate at the suture. 
1. Metacorthylus nigripennis, sp.n. (Tab. VIII. figg. 10; 10a, antenna.) 
Fem.(?). Oblonga, cylindrica, opaca, ochrea, ore et prothorace apicem versus infuscatis, elytris nigris ; 
prothorace ad apicem rotundato, postice parallelo; elytris vix perspicue punctatis, postice haud angus- 
tatis, ad apicem retusis, retusione ovali, haud acute marginata, medio longitudinaliter impressa, utrinque 
bituberculata. 
Long. 3 millim. 
Female(?). Oblong, cylindric, dull, the entire surface with close microscopic reticulation. Head brown- 
yellow, subimpressed over the mouth, and with a raised oval shining patch above the impression ; mouth 
infuscate, fringed ; eyes convex, rather broad, emarginate ; antenne infuscate. Prothorax oblong, rather 
obtusely rounded in front, without apical tubercles, parallel-sided behind the middle, with rounded- 
rectangular hind-angles, the base sub-bisinuate, not bordered; surface with a slight ante-median 
transverse elevation, convex in part, cylindrical behind, dull ochreous, the convex anterior portion with 
an ill-defined infuscate patch, and rough with small close granules, neither transverse nor in concentric 
lines, the basal half scarcely visibly punctate. Scutellum minute, triangular, black. Elytra as wide as 
the prothorax and about one-fourth longer, truncate at base, with narrowly rounded shoulders, parallel- 
sided, not narrowed behind, strongly and almost abruptly inflexed to the obtuse apical margin ; surface 
cylindrical, black, inconspicuously punctured, sudtruncate at apex; the declivity longitudinal oval, with 
defined but not acute side-margins, sub-impressed along the suture, slightly raised and bituberculate on 
each side, its surface subrugose and finely pubescent. Underside and legs ochreous. 
Hab. Panama, Bugaba (Champion). 
