PELTOPHORUS. —ZYGOPS. 21 
the upper and under surfaces, and on the pygidium and legs. The males have a very 
large, pilose, pyriform depression on the abdomen beneath, extending from the base to 
the apex, the corresponding space being simply flattened and squamose in the female. 
Leconte and Horn‘ suspected that Z. seminiveus was identical with a Mexican species. 
I have seen Desbrochers’s type of Z. leopardinus. 
2. Peltophorus jordani. (Tab. II. figg. 10, 10.) 
Peltophorus jordani, Heller, Abhandl. Mus. Dresd. no. 11, p. 18°. 
Hab. Mrxico (Mus. Brit.), Cuernavaca (Mus. Dresden}, Sailé), Parada (Sallé). 
This insect differs from P. polymitus in having the disc of the prothorax separated 
from the flanks by a distinct sinuous ridge, and the disc itself immaculate between the 
sharply-defined brownish-white marginal stripe; the elytra are slightly mottled with 
light and dark scales, and have a short pallid streak along the suture below the base. 
The rostrum is closely punctate to the apex in the male, the apical portion being 
smoother in the female. The ventral depression of the male is much shallower than 
in the same sex of P. polymitus and does not extend beyond the second segment; the 
hairs, too, are wanting. 
ZY GOPS. 
Zygops, Schénherr, Cure. Disp. Meth. p. 3800 (1826); Gen. Cure. iv. p. 601; Lacordaire, Gen. 
Col. vii. p. 150; Desbrochers, Ann. Soc. Ent. Belg. xxxv. p. 37 (1891); Heller, Abhandl. 
Mus. Dresden, no. 11, pp. 8, 17 (nec Leconte and Casey). 
A Tropical-American genus including about fifty described species and well repre- 
sented within our limits. It is chiefly recognizable by the completely exposed 
pygidium, the moderately long rostrum, and the flattened mesosternum. The identi- 
fication of some of the smaller forms is, unfortunately, impossible from the descriptions 
alone, often based upon insufficient material, and even in Desbrochers’s various papers 
on Zygops the sexual characters are not recognized as such or ignored. The males 
have the first two ventral segments more or less depressed down the middle, the. 
depression on the second segment sometimes pilose, and the anterior tarsi in a few 
cases (Z. vitticollis and Z. mewicana) hairy, as in certain Cryptorrhynchids. 
a. Posterior femora extending far beyond the apex of the abdomen, 
longer than the elytra, bidentate; posterior tibiz sharply mucro- 
nate at the inner apical angle; prothorax feebly bisinuate at the 
base; neck and pygidium carmine-red . . . . . . . . . . rufitorquis, sp. n. 
6. Posterior femora less elongate, extending beyond the apex of the 
abdomen, but shorter than the elytra. 
a’. Posterior knees with the outer lobe angularly produced ; posterior 
femora bi- or tri-dentate; prothorax subtruncate at the base, 
sharply trivittate; body elongate . . . . . .. . . . .~ Vitticollis, Desbr. 
