390 TERTIARY INSECTS OF NORTH AMERICA. 



by a transverse constriction, noticeable particular!}' by the deep lateral 

 notch ; anterior lobe rapidly narrowing with strongly oblique convex sides, 

 two and a half times broader than long, the surface apparently smooth, 

 light colored, with broad, marginal, dark bands, a faint dusky median stripe 

 fading posteriorly, and three dark round spots, one in the middle of each lat- 

 eral half posteriorly and one in the middle of the posterior margin, overlap- 

 ping the posterior lobe ; this last is broader than the anterior, with strongly 

 convex sides, and is three times as broad as long, its posterior lateral angles 

 not rounded ; the posterior margin is transverse outwardly and next the 

 base of the scutellum, a little oblique between ; the surface is dark poste- 

 riorly, lighter anteriorly, the whole rather coarsely and faintly punctate. 

 Corium of hemelytra clear and smooth, with distinct and straight subcostal 

 vein and fuliginous outer angle (the other dark spots on the surface of the 

 corium in the plate belong to the middle and hind femora) ; membrane 

 clear. 



Length (without head), 4.5°"": probable complete length, 5"""; breadth 

 of thorax, 1.7""". 



Grreen River, Wyoming. One specimen. No. 113 (Dr. A. S. Packard). 



(i. LITHOCORIS gen. nov. (A/'6)o?, m'pi?). 



Head large, subrotund, slightly broader than long, with moderately 

 large eyes, which are situated just behind the middle of the head, at its 

 greatest lateral expansion as broad as the middle of the thorax ; front 

 rounded, angulate in advance of the base of the antennae ; antenna^ more 

 than half as long as the body, the basal joint pretty stout, surpassing a little 

 the front of the head, the remaining joints subequal, the second the shortest, 

 all very slender, but the last slightly incrassated to about the width of the 

 basal joint. Thorax slightly longer than broad, divided into anterior and 

 posterior lobes of equal length, both tapering from base to apex, the ante- 

 rior more rapidly than the posterior and with perfectly straight oblique 

 sides ; the base fully twice as broad as the apex. Legs moderately slen- 

 der, the middle femora fully three-fourths the width of the body at their 

 insertion. Corium of hemelytra reaching the middle of the apical half of 

 the abdomen, which is full, laterally ampliated, half as broad again as the 

 base of the thoi'ax. 



A single species is known. 



