PTEROCYCLON. 281 
margins separately rounded when seen from behind and narrowly emarginate at the suture, its surface 
subconvex, moderately shining, and shortly pilose, with an elevation at its upper part on either side of the 
suture bearing one or two inconspicuous tubercles. 
Hab. Guatemata, San Juan in Vera Paz (Champion). 
One specimen. I have four or five others from tobacco-refuse, among which I can 
detect no sexual differences. This species is about the size of P. pumilio, Hichh., but 
differs from that insect, as described, in having the elytral tubercles situated within 
and not on the margins of the declivity. In the shape of the antennal club it 
somewhat approaches Brachyspartus. 
17. Pterocyclon laterale. (Tab. VIII. fig. 18, apex of elytra.) 
Pterocyclon laterale, Kichh. Berl. ent. Zeitschr. 1868, p. 278°; Rat. Tom. p. 439’. 
Hab. Mexico !, Toxpam (Sallé). 
I identify as this species two examples, apparently males, obtained by M. Sallé. 
They are a little darker in colour than Eichhoff’s description implies, and have the 
suture, as well as the side-margins and apex, of the elytra infuscate. Both are 
probably rather more mature than the type, which has not been accessible for 
examination. 
18. Pterocyclon bispinum, sp.n. (Tab. VIII. fig. 19, 3, apex of elytra.) 
Mas. Cylindricus, sat nitidus, testaceus, subtus pallidior, plaga in prothoracis disco magna posterius producta, 
elytrorum lateribus et apice subinfuscatis; fronte opaca; elytris obsolete lineato-punctatis, ad apicem 
excavatis, excavatione concava, cordata, ambitu acute marginato, utrinque 3-dentato, dentibus 1 et 2 
prope suturam parvis, 3° ante medium magno. 
Long. 3 millim. 
Male. Oblong, cylindrical, somewhat shining, testaceous-brown, with a discal patch on the prothorax and the 
sides and apex of the elytra somewhat infuscate. Front of the head subconvex, opaque, scarcely 
punctured, mouth not fringed; antenne testaceous-brown, the club oval, with curved sutures. Prothorax 
one-fourth longer than broad, its apical margin strongly rounded and subcrenate, the sides subparallel 
from behind the middle, hind angles somewhat obtuse, the base truncate ; disc with no median elevation, 
its anterior third part declivous and finely asperate, the remainder moderately shining, impunctate. 
Scutellum transverse, with rounded margins, infuscate. Elytra scarcely as wide as the prothorax and 
less than one-third longer, truncate at the base, the humeral angles rounded, the sides slightly curved 
throughout and convergent behind the middle, the apical margins separately and strongly rounded, with 
an obtusely-angled wide median emargination, not angulate externally; surface slightly convex from base 
to apex, flattened round the scutellum and with a few distinct punctures, otherwise punctured very 
obsoletely in rows, the suture slightly impressed before the declivity, which is oblique, broadly excavate 
and entirely concave, shining and punctured, its margins sharply elevated, cordate in outline, with three 
teeth on each side, the first two small pointed tubercles close to the suture above, the third just before the 
middle, rather long, pointed, and slightly incurved at the tip; pubescence consisting of a few hairs on and 
outside the margin of the declivity. Underside and legs lighter testaceous. 
Hab. Panama, Bugaba (Champion). 
The single specimen received is allied in general aspect to P. laterale, or rather to 
the insect here identified with that species; but in the latter the armature of the 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 6, June 1905. 200 
