CRATOSOMUS.—PIAZURUS. 9 
the seriate punctures oblong, &c. The smoother prothorax, &c., distinguish it from 
C. gemmatus. No species with bidentate femora is mentioned in Schénherr’s work. 
PIAZURUS. 
Zygops, subgen. Piazorus, Schénherr, Cure. Disp. Meth. p. 303 (1826). 
Piazurus, Schénherr, Gen. Cure. iv. p. 651 (1837) ; Lacordaire, Gen. Col. vii. p. 147; Heller, 
Abhandl. Mus. Dresden, no. 11, pp. 3, 4 (1895); Stett. ent. Zeit. 1906, pp. 31, 32 
(nec Leconte). 
A Tropical-American genus including numerous species*, mostly of large size, 
several of which are abundant within our region. They are elliptic, rhomboidal, or 
subovate in shape, and have the femora clavate—the posterior pair very stout and 
armed with a large triangular tooth, the others usually with a small tooth,—the eyes 
large, oval, and contiguous or narrowly separated, the second joint of the funiculus, 
and usually the third also, elongate, the mesosternum excavate and rather long, and 
the pygidium narrowly exposed. The fifth ventral segment is more or less rounded 
at the apex in the female, and sinuato-truncate or emarginate in the male. The 
Central-American species, for some of which Dr. Heller has proposed two subgenera, 
may be tabulated thus :— 
A. Ventral segments distinctly ascending, 2 at the sides about as long 
as 8 and 4: united; all the femora toothed. Posterior tibize mucro- 
nate or not at the inner apical angle. [Prazurvs, s. str.] 
a. Joint 2 of the funiculus as long as, or one-half longer than, 3 ; 
prothorax conical or subconical. 
a’, Elytra emarginate or truncate at the apex. 
a’, Prothorax trifoveate on the disc. 
a’. Elytra with a sharply-defined, saddle-shaped, black median 
fascia, the prominences obsolete . . . . . . « + « érifoveatus, sp. n. 
6°. Elytra with a common, irregular, cinereous patch occupying 
the depressed space on the disc, the prominences black and 
conspicuous. . . « . © + + 1 ee ew ew ee 6 plagiatus, sp. n. 
6°, Prothorax without depressions on the disc. 
c’. Elytra with a very large conical tubercle near the base of 
the third interstice ; prothorax with a broad arcuate band, 
and the elytra with a common saddle-shaped patch or 
fascia, black. . 2 0. we ee ee ee ee  Caprimulgus, Oliv. 
da’. Elytra with a smaller prominence or tubercle at or near the 
base of the third interstice. 
a‘. Prothorax and elytra with numerous small ochreous 
spots. . . ee we ee ee ew ee ee Spretus, Heller. 
* It is probable that a number of those described by Boheman will have to be sunk, to judge from the 
great variability of P. maculipes. 
BIOL. CENTR.-AMER., Coleopt., Vol. LV. Pt. 5, Aprad 1906. CC 
