292 G. n. HORN, M. D. 



Elytra cylindrical interruptus* 



Elytra inflated, broadly oval caelatus. 



Clypeus with a distinct tootb on each side. Thorax witiioui ridges bideas. 



Ps. aegialioides, Hald. Journ. Acad. 1848, p. 107. — Oblong oval, piceous. 

 shining, elytra slightly paler. Head coarsely verrucose, clypeus emarginato, 

 margins slightly reflexed and rufous. Thorax nearly twice as broad as long, 

 broadest at middle, sides rounded; disc with four elevated transverse ridges, 

 smooth, the hinder two interrupted by a longitudinal groove, intervals between 

 the grooves very coarsely punctured. Elytra gradually wider behind, deeply 

 striate and jiunctured, intervals convex smooth. Body beneath piceous, sides 

 of metasternum coarsely punctured, abdomen nearly smooth: legs brownish 

 femora sparsely punctured. Length .16 inch; 4 mm. 

 Middle and Southern States, not common. 



Ps. quinqueplicatus, n. sp. ^Oblong oval, ferruginous, shining. Head ver- 

 rucose in front, occiput smoother, elypeus rather deeply and acutely emargin- 

 ate, margin slightly reflexed. Thorax one half broader than long, sides moder- 

 ately rounded, disc with five transverse ridges indistinctly marked, the hinder 

 three interrupted at middle, smooth at tip, intervals very coarsely punctured. 

 Elytra oval broader behind, strise moderately deep orenately punctured, inter- 

 vals moderately convex, impunctured. Body beneath ferruginous, abdomen 

 with a few coarse punctures. Length .14 inch; 3.5 mm. 



This species is easily known from the preceding by its much paler 

 color, more indistinct thoracic ridges, more deeply emarginate clypeus 

 and more robust form. The hind tibise are much less muricate. 



Two specimens collected by Major Webb, of the U. S. and Mex. 

 Boundary Survey probably in Arizona, or Western Texas. 



Ps. interruptus, Say, Bost. Journ. I, p. 178. — Piceous, elytra paler, moder- 

 ately shining. Head verrucose, clypeus deeply emarginate, margins rufous 

 and slightly reflexed. Thorax nearly twice as broad as long, broadest behind 

 the middle, surface with three very indistinct transverse elevations which are 

 sparsely punctured intervals coarsely punctured. Elytra oblong not broader 

 behind, strice moderately deep catenulate, intervals flat with a series of punc- 

 tures. Body beneath somewhat paler in color than the upper surface, abdomen 

 with a few coarse punctures. Legs brownish, middle and hind femora with a 

 marginal line behind and a few coarse punctures arranged in line near the 

 apex. Length .13 inch ; 3.25 mm. 



One specimen from the Middle States, is referred to the species. It 

 is more parallel and cylindrical than any other in our fauna. 



Ps. caelatus, Lee. {^giaha) Pacif. R. R. Rep. 1857. App. I, p, 42. — Oval con- 

 vex, piceous shining. Head verrucose, clypeus emarginate obtusely rounded 

 each side. Thorax twice as broad as long, sides moderately rounded above 

 with three indistinct transverse ridges interrupted at middle, smooth; intervals 

 coarsely punctured, that between the second and last ridges deeper. Elytra 

 broadly oval very convex, scarcely one fourth longer than broad ; striate, 

 strife punctured, intervals nearly flat impunctured. Body beneath piceous, 

 abdomen with few punctures; legs ferruginous, hind tibiae stout. Length .13 

 inch; 3.25 mm. 



