PTEROCYCLON. 285 
antennarum clava ovali, longius ciliata; elytris subtiliter punctulatis, mox pone basim preter suturam 
impressis, declivitate convexiuscula, sat nitida, in singulo elytro subelevata, bituberculata, 
Long. 2°7 millim. 
Female. Oblong, not very elongate, moderately shining, nearly glabrous above. Head fuscous-black, deeply 
impressed on either side in front of each eye, and with an oblong glossy elevation extending from the 
mouth to the vertex, somewhat wider in the middle, and margined with coarse, forwardly-directed, yellow 
hairs, longer above but absent over the middle line, mouth thickly fringed ; mandibles rufescent, powerful, 
notched on their inner border; eyes moderately large, deeply emarginate; antenne testaceous, the 
funiculus two-jointed, the club oval, with obliquely-curved sutures, and with a fringe of long hairs 
arising chiefly from its superior border, its lower apical angle with a few shorter cilia. Prothorax more 
than one-fourth longer than broad, broadly rounded at the apex, the sides parallel from the anterior 
third to the base, the latter slightly rounded, the hind angles obtuse; surface very obliquely declivous 
in front, with a slight elevation rather behind than before the middle, anteriorly fuscous-black, the 
infuscate shade extending above to the hinder third, the sides and base dull testaceous, subglabrous and 
finely asperate before the elevation, behind rather dull and imperceptibly punctate. Scutellum 
transverse, obtusely triangular, fuscous-black. Elytra narrower than the prothorax and but little 
longer, separately rounded at base, with obliquely-rounded shoulders, the sides becoming a little widened 
behind the base, then subparallel to the hinder third, whence they are slightly incurved, apical margins 
obtusely rounded, with a shallow median emargination ; surface cylindrico-convex, testaceous-brown, the 
sides and apex, but scarcely the suture, infuscate, moderately shining, and extremely finely punctured in 
rows; sulcate along the suture from the basal third to the apex, the sulcus shallow, narrower than in 
P. suleatum, not rugose, its side-margins curved, obsoletely tuberculate, the sutural margins a little 
raised ; apex strongly declivous, but convex and not retuse, callous and bituberculate on each side of 
the sutural sulcus, somewhat shining, and furnished with a few scattered hairs, Underside infuscate ; 
legs testaceous. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One specimen. Allied to Pterocyclon (Cosmocorynus) cristatum (Ferr.), with which 
I identified it before seeing the type of that insect. The latter example is rather 
smaller, with the frontal elevation wider and shorter, and the prothorax less parallel- 
sided; its elytra are more narrowed behind; the sutural sulcus is better-marked, 
rougher, and fuscous-black ; the apex is dull, more oblique, less evidently punctured ; 
the tubercles are inconspicuous. 
The last-mentioned specimen, the type of Cosmocorynus, has hitherto been examined 
by no one save Ferrari, and the genus was regarded by Eichhoff as a part of Corthylus. 
But in P. cristatum the funiculus is 2-jointed, and not single-jointed as described and 
figured by Ferrari. The relationship of this insect to Corthylus is therefore disproved, 
and, indeed, it does not resemble any species of that genus inappearance. ‘The corneous 
processes on the head and the curved horn on the antennal club described by Ferrari 
are, as was to be expected, nothing more than collections of matted hairs. 
23. Pterocyclon fimbriaticorne, sp. n. (Tab. VIII. fig. 24, 2, antenna.) 
Fem. Subelongata, subnitida, fusco-picea, prothoracis basi, lateribus, elytrorum antica dimidia parte 
(limbo laterali excepto) sordide flavo-testaceis ; antennarum scapo valde dilatato, clava magna, transversa, 
triangulari, pilis longis ciliatis ex articulo basali et marginibus superiore et apicali orientibus ornata ; 
fronte excavata, trifasciata; elytrorum declivitate oblique retusa, obcordata, utrinque bituberculata. 
Long. 3 millim. 
