282 RHYNCHOPHORA. 
declivity consists of three small pointed tubercles placed at almost equal distances 
on each side-margin. 
19. Pterocyclon vittatum, sp. n. (Tab. VIII. figg. 20, 2; 20a, apex of 
elytra, 2.) 
Fem. Cylindrica, subnitida, fusco-nigra, prothorace vitta transversa, elytris plaga humerali testacea ornatis ; 
antennis pedibusque testaceis, illarum clava ovali, in pagina interna dense fusco-ciliata; elytris 
subtilissime punctulatis, apice medio emarginatis, declivitate convexa, preter suturam suleata, in utroque 
latere callose elevata, bituberculata. 
Long. 2°7 millim. 
Female. Moderately elongate, cylindrical, slightly shining. Head black, subconvex in front, somewhat 
shining, with close substrigose punctuation, the epistoma margined, the mouth thinly ciliate; antennez 
testaceous, the club oval, with curved sutures, its inner face concealed by a dense fringe of fuscous hairs 
arising from it and the upper margin. Prothorax a little longer than broad, rounded in front from before 
the middle, the sides nearly parallel behind, the base truncate, the hind angles subrectangular ; surface 
gradually declivous in front, without a discal elevation, black at apex, fuscous-black at base, with an 
antemedian transverse testaceous-brown vitta curved backwards and widened at the sides, the apical 
third asperate, the remainder very finely shagreened. Scutellum rounded, black. Elytra narrower than 
the thorax and nearly one-half longer, subtruncate at base, the shoulders obliquely and broadly rounded, 
the sides very slightly curved and scarcely convergent behind, rounded at the junction with the apical 
margins, which are nearly transverse (when seen from above), with a shallow median emargination ; 
surface cylindrico-convex, yellowish-testaceous, the sides, the greater part of the sutural margins and 
apex fuscous, becoming black apically, finely shagreened and hardly visibly punctate; apex strongly and 
curvedly declivous, bordered below, somewhat deeply impressed along the suture, and elevated on each 
side of the impression into a bituberculate callosity. Underside fuscous-black ; the legs testaceous. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One example. The colour will distinguish this species from the two preceding, 
with which it shows some affinities. Neither of the latter has any trace of a dark base 
to the thorax, the presence of which in P. vittatum helps to define the characteristic 
median light vitta. The elytral declivity is differently formed, but it remains to be 
seen how far this may vary in the male. 
Division IT. 
Front in the female excavate, or foveolate over the eyes, with an elevated median area surrounded with 
long fimbriate hairs. (Cosmocorynvs, Ferr.) 
To this division belong, besides the following described species, Cosmocorynus 
cristatus, Ferr., and perhaps Trypocranus eincinnatus, Eichh. Corthylus bicolor, 
Ferr. (2), is an osculant form between the two divisions, having a deep fovea over 
each eye, an impression on each side of the epistoma, and a medial frontal elevation ; 
it 1s, however, destitute of fimbriate hairs, which are present in all the other 
species. 
The only male form which is certainly identified as belonging to this division, that 
of P. lobatum (Ferr.), presents no peculiar features whatever to distinguish it from 
those of Division I. 
