58 BULLETIN BROOKLYN ENTOM. SOC. VOL. VI. August 1884 ] 
The thorax is distinctly wider in this than in any other species, so 
that it is almost if not quite as wide as the elytra at base. All the joints 
of the hind tarsi are densely pubescent or spongy beneath, with a smooth 
median channel. The lateral teeth of prothorax are well developed, 
sometimes even slightly reflexed as in calzfornmicus. The color is brown- 
ish varying to black. It is generally darker than in the other species. 
Length, {to 1% inches = 22-47 mm. Habitat, Northern, Middle and 
Atlantic States. 
P, pocularis, Dalm. Schoenh. Syn. Ins. I, 3, 1817, p. 148; curticornis, Lec. 
J. A. P. ser. 2, II, p. 109; obliquicornis, Lec. J. A. P. ser. Il, p. 108; laevigatus, 
Harris, Trans. Soc. Htford 1836, p. 83, t. 1, f. 6; Lec. J. A, P. ser. 2, Il, p. 109; 
denticornis, Sturm, Cat. 1836, p. 187. 
The thorax is narrower than the elytra at base, the lateral teeth pro- 
minent but never reflexed. The first joint of hind tarsi is almost en- 
tirely glabrous, the second and third spongy with a median smooth chan- 
nel.’ Color as in /aficolis but not so dark, antennz more slender. 
Length, 1 to 1.75 inches = 25—45 mm. Habitat, Middle and South— 
ern States. 
P, californicus, Motsch. Bull. Mosc. 1845, I, p. 89, t. 2, f.9; Mannh. Bull. 
Mose. 1852, Il, p. 364; crassicornis, Lec. J. A. P. ser. 2, II, 1852, p. 108 
The species is distinguished by the very acute and strongly reflexed 
lateral teeth of prothorax. The soies of the hind tarsi are as in daticollis. 
Color as in preceeding. Length 13 to 2} inches = 45—52 mm. Hab. 
California. 
Curvatus is a variety of the Jast in which the lateral teeth are more 
reflexed than in the typical form. 
The above species are very closely related. The characters given 
will serve to separate them although specimens will be found which will 
seem intermediate in form. It is a remarkably interesting fact that the 
specific differences intergrading as they do are such as are used to sepa- 
rate the genera in many families. 
P. imbricornis, Linn. Syst. Nat. Ed. XII, p. 622; Beauv. Ins. Afr. et Am. 
15 Bae) AG oye, QD Weed alam see a INL pol, uel, 
The thoracic teeth are much less prominent in this species, showing 
a gradation to Homesthesis. ‘The number of the antennal joints varies 
somewhat, in the specimens under examination within the limits given 
in the table. Each joint in (¥' is conical hollowed to receive succeeding 
joint and with the lower edge prolonged; in Q much more slender and 
