CORTHYLUS. 257 
One example. In this species the joints of the antennal club are individually 
convex on their outer face, the apical one being incompletely divided into two; unless 
they are carefully examined, it might be supposed that they were separated as in 
Phieotribus. It is from an antenna of this kind that Ferrari drew the characters of 
his genus Morizus. The inner face of the club shows an oblique streak of sensitive 
surface, surrounded by a shallow groove. 
4, Corthylus ptyocerus, sp. n. (Tab. VIII. figg. 5, 6 ; 5a, antenna, ¢ ; 
6, antenna, ° .) 
Oblongo-ovalis, niger, antennis pedibusque ferrugineis; prothorace semi-elliptico, dorso medio linea transversa 
elevata, antice rugulis longis transversis asperato, postice parum nitido, obsolete punctato; elytris 
nitidis, irregulariter distincte punctatis, punctis hic illic in lineas ordinatis, declivitate convexa, preeter 
suturam impressa, lineato-punctata, marginibus impressionis tuberculatis. 
Long. 4:2 millim. 
Mas. Fronte subconvexa, punctata; clava antennali ovali ; prothoracis apice bituberculato. 
Fem. Fronte ad oculos impressa, dense pilosa; antennarum clava permagna, late subtriangulari, marginibus 
superiore et apicali cirratis; prothoracis apice inermi. 
Oblong-oval, black, the antenne and legs ferruginous. Forehead ( ¢ ) subconvex, rufescent, subnitid, punctured, 
glabrous ; eyes coarsely granulate, deeply emarginate, extending below to the buccal orifice; antenne 
inserted in the ocular emargination, the scape scarcely thickened apically, the club obovate, apparently 
4-articulate, the basal suture nearly straight, the others curved, the outer face with thin short pubescence, 
the inner face with the basal suture alone distinct. Forehead ( 2 ) impressed to the eyes, rufescent, with 
close short erect pubescence, the raised side-margins and a median carina shining, mouth not fringed ; 
antennal scape broadly dilated, truncate, the lower apical angle acute ; club very large, broadly triangular, 
the lower margin bisinuate, the apical margin transverse, joining the curved superior margin by a 
rounded angle, the latter fringed with cirri curling round the apex, but scarcely reaching its lower angle ; 
the outer face shortly pubescent, with three curved sutures, the inner face with the apical half almost 
entirely covered with a large sensitive patch. Prothorax as broad as long, widest near base and narrowed 
anteriorly, the sides and apex elliptically rounded, with a sinuate anterior opening, the apex (¢) more 
convex and bituberculate, the apex ( 2 ) more obtuse and simple, the basal border bisinuate and margined ; 
surface with a postmedian transverse elevated line, black, the apex sometimes lighter, with short 
scattered hairs, the anterior two-thirds with very transverse imbricate asperities, the posterior third 
rather dull, obsoletely punctured. Scutellum large, triangular. Elytra as wide as the prothorax and 
less than one-half longer, closely applied to it at base, the sides gently rounded, scarcely narrowed 
behind, and strongly inflexed to the obtuse apex ; surface subconvex from base, strongly but not abruptly 
convex behind, black or piceous, shining, irregularly and distinctly punctured, more closely at the base, 
becoming lineate-punctate towards the apex; declivity flattened, subimpressed, and with two rows 
of punctures on each side of the suture, margins of the suture and the impressions somewhat elevated, 
each with three or four piliferous tubercles. Underside black, with rather long pubescence; prosternum 
elevated in front of the coxe. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One male and three females were taken. This interesting species shows in the 
latter sex a more striking antennal development than does any other Corthylus. The 
club measures as much as 1 millimetre in width. 
BIOL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 6, November 1904. 2 LL 
