458 TEBTJAKY INSECTS OF NOliTQ AMERICA. 



THNETOSCHISTITS REVULSUS. 

 PI. 28, Fig. 6. 



Whole body griseous, the juga apparently lighter than the tylum, the 

 membrane faintly infatuated. . Head faintly, shallowly, and coarsely punc- 

 tate; thorax distinctly, rather sparsely, and coarsely punctate ; scutellum 

 still more coarsely punctate, but otherwise similar: corium of hemelytra 

 punctate like the thorax, but less coarsely and less sparsely. 



Length, U.. r >""" : breadth of base of thorax, 6.5 mm 



Florissant, One specimen, No. 1.837, collected by the Princeton 

 Expedition. 



;5. POTKSCHISTUS gen. nov. (a-nrt, a-/_,OT^). 



Remarkable for the regularly ovate form of the body. [Head unfortu- 

 nately wanting.] Thorax more or less broken and crushed, so as to render 

 its precise form indeterminable, but apparently it was uniformly vaulted, 

 nearly twice as broad as long, tapering from the very base with no lateral 

 projections, the sides arcuate and tapering pretty regularly; the outer 

 anterior angles well rounded, the apical margin less than half the width of 

 the base, gently and regular! v emarginate for the reception of the head. 

 Scutellum triangular, as long as broad by reason of the arcuation at the 

 base of the otherwise straight sides, the tip angulate, not in the least rounded 

 or produced, reaching barely half-way to the tip of the somewhat conical 

 abdomen, which the hemelytra surpass a little. 



A single species is known. 



POTESCHISTUS ORNUBILUS. 

 PI. 28, Fig. 18. 



The thorax is smooth except for an exceedingly sparse, low, and incon- 

 spicuous granulation. Scutellum, on the contrary, very coarsely granulate 

 indeed and less sparsely; the hemelytra midway between the two and 

 tolerably dense; membranal suture with a barely perceptible arcuation 

 opening outward, and the otherwise clear but faintly veined membrane 

 coriaceous at its extreme inner base, between the membranal suture and tin- 

 em! of the claval suture. Whole body brownish griseous, the scutellum 

 lighter. 



Length, excluding head, 13.75 imn ; breadth, 7.5 mm . 



Florissant. One specimen, No. 147l'. 



