COLEOPTERA. 
49 
$ Majores: Antennis basi valde eras sis, versus apicem successive tenu- 
ioribus, apicem elytrorum non attingentibus , articulis cylindricis , 
apice breviter clavatis , ultimo clavce ohlongo-acuto. 
$ Subdimidio minores: Antennis apicem pectoris non attingentibus , 
articulis pro ralione sat crassis , versus apicem incrassatis, parum 
clavatis , ultimo clavce oblongo-acuto. 
5 Antennis medium thoracis superantibus , pro ratione crassis , clava 
latiore , articulo ultimo breviter ovato-acuto. 
Longit. (rostr. inch) 6— 11 lin. = 13—25 millim. 
Latit. hum. —2§ lin. = 3f g —6 millim. 
Macroceplialus nebulosus , Oliv. Entom. Coleopt., t. iv., No. 80, pag. 5 ; 
Tab. i., 3, a , 6, c. (Sec. Typ. in Mus. Dorn. Chevrolat). 
Patria : Cayenna. — Dom. Olivier, Mus. Chevrolat — Dupont, Mus. 
Jekel. 
According to a typical specimen from the Oliverian collection, in the 
possession of my obliging friend M. Chevrolat, the insect above described 
is the true nebulosus of that author, although the description certainly agrees 
not only with this, but with the preceding and the three following species, 
as well as with some others. But Olivier’s figures, and especially that of 
the male, better represent this specie^ than any other, in the shortness of 
the body, combined with the narrowness of the elytra, although the elonga¬ 
tion of the subapical callosities is exaggerated. 
From the narrowness of the elytra posteriorly, especially in the large 
males, it much more nearly resembles Pt. elongatus than the two following 
species, but it is proportionally much shorter, more so than Pt. Columbianus , 
not so much so as Pt. tricostifrons. The depression of its elytra is shallower 
than in the former and the latter, but somewhat less than in Pt. Colum¬ 
bianus. The coloration of its body beneath is of a greener white, the 
common band of the elytra is darker (light fulvous, subferruginous, rarely 
whitish), its borders less indicated on the lateral ground, which is of a 
lighter fuscescent tomentosity, and more mixed with the fulvescent colour 
of the band, the emarginations of this being only darker and hardly 
mixed. 
Head shorter than in the above-mentioned species {Pt. tricostifrons 
excepted), transverse; front at least as convex as in Pt. Columbianus , con¬ 
sequently evidently more so than in Pt. elongatus. Eyes as convex as in 
Pt. tricostifrons. Rostrum as robust as in that species. 
H 
