502 RHYNCHOPHORA. 
b’. Sides of prothorax sulcate beneath the lateral carina . . . . Genus No. XXXIX. 
Sides of prothorax not sulcate beneath the lateral carina . . . Genus No. XL. 
c’, Carina of prothorax distant from base . . . . . . . + . Genus No. XXXV. 
Carina of prothorax basal . . . 2... . ww ee ee a 
d’, Globular, glossy black . . 2... . we eh eS)0CUGents No. XXX VIII. 
Not globular and glossy black; carina of prothorax extending to 
apex. . ee we ee eee ee ee ee we ee) 6Genuss No. XXXVI. 
As before ; carina of prothorax not extending to apex .. . . . Genus No. XXXVII. 
A. Subfam. PLEUROCERIN A. 
I. PTYCHODERES. 
Macrocephalus, Olivier (nec Swederus, 1787), Ene. Méth. iv. Ins. p. 86 (1789) (partim). 
Anthribus, subgen. Ptychoderes, Schoenherr, Curc. Disp. Meth. p. 34 (1826) (type: elongatus). 
Ptychoderes, Schoenherr, Gen. Spec. Cure. i. p. 120 (1833) ; Jekel, Ins. Saund. i. p. 41 (1855) ; 
Lac. Gen. Col. vii. p. 488 (1866) (partim). 
Range: South and Central America, Cuba. 
3 2. The rostrum bears three heavy carinw on the upperside, the mesial one being prolonged over the frons. 
There are two deep longitudinal grooves laterally between the eye and antenna. The frons bears, besides 
the mesial carina, on each side a short but thin carina. The first segment of the fore tarsus is very little 
longer than the second. 
The antenne are generally longer in the males than in the females, reaching often beyond the apex of the 
elytra, but the difference is sometimes not very great, small males having often short antenn. Such small 
specimens are recognizable as males by the fifth abdominal segment, which is shorter than the fourth in 
the males and longer than the fourth in the females. In some species there is, moreover, a sex-mark on 
the abdomen situated on the first segment. This mark is an elliptical or nearly circular shallow groove 
bordered by a slightly raised rim and filled in with a short velvety pubescence. The mark does not occur 
in American forms outside the genus, but reappears in the Oriental Fauna, being found in Phleopemon 
ortentalis, Lac, (1866), a species originally described as a Ptychoderes, but representing a distinct genus. 
The species of Ptychoderes can be conveniently separated into two groups :— 
I, Pronotum not rugate outside the central depression ; prosternum finely punctured in middle, 
the groove in front of each anterior coxa shallow and narrow, often only vestigial, the two 
grooves not connected with one another across the intercoxal process.—Here belong 
P. tricostifrons, Fahr. (1839), from Central America, and the South-American nedulosus, 
Oliv. (1795), elongatus, Germ. (1824), columbianus, Jek. (1855), antiquus, Jek. (1855), and 
affinis, Jord. (1894). The last two species have the elytra strongly convex behind, the elytra 
being devoid of the subapical tubercle found in the other members of this group. I doubt 
very much that those species with elytral tubercles are really specifically distinct from one 
another. 
II. Pronotum rugate also outside the central depression ; prosternum coarsely punctured ; ante- 
coxal grooves deep and connected with one another, often merged together into one large 
transverse groove.—Here fall all the other species of the genus, viz., viridanus, Boh. 
(1833), brevis, Jord. (1894), longicollis, Jord. (1894), obsoletus, Jek. (1855), virgatus, Fahr. 
(1839), mixtus, Jek. (1855), bivittatus, Jord. (1894), rugicollis, Jord. (1895), callosus, Jek. 
