BEMIPTERA HBTBEOPTBBA PENTATOMIDJS. 451 



."). THLIBOMENUS MACKK. 



Head scarcely longer than broad, small, not a quarter the width of the 

 thorax. Thorax several times broader than long-, the sides very oblique, so 

 that it tapers rapidlv forward and has the front broadly rounded, with 

 scarcely any sign of emargination opposite the head, the surface even and 

 apparently very coarsely granular. Scutellmn similar, triangular, more 

 than two-thirds as broad as the thorax, and shorter than broad, but reach- 

 ing about, half-way to the tip of the abdomen. Hemelytra with the corium 

 rather short, coarsely and obscurely punctate. Abdomen well rounded, 

 scarcely longer than broad. Color of the body black, the corium fuscous, 

 membrane infumated. 



Length, 4 nini : breadth, 2.5"'" 



Florissant. < >ne specimen, No. 24f>5. 



f). (TRTOMENUS Ainyot and Servill,-. 



This tropical American type, with four or five species, one of them 

 found in our Southern States, occurs also so far as the imperfect remains can 

 determine in the Tertiarv beds at Green River, where one species is found, 

 remarkable for the great width of the head. It is the only fossil known. 



CYRTOMEXUS roxcixxus. 



I'l. 7. Fi. 14. 

 Ci/rtonieniiH coiicinnits Scmlil., Bull. U. S. (Jcol. Keogr. Surv. Terr.. IV, "ti'J (1878). 



This species is represented by a single specimen, a little smaller than 

 C. mirabilis (Perty), but closely resembling it in general form. It is broadly 

 ovate; the head large, prominent, well rounded, nearly half the eyes pro- 

 truding 1 beyond the margin, the ocelli nearly one-fourth the diameter of the 

 eyes, and situated next the hind border, very nearly half-way between the 

 inner margin of the eyes and the middle line of the head. Thorax twice as 

 broad as the head exclusive of the projecting part of the eye, more than 

 twice as broad as long, the trout margin rather deeply and regularly con- 

 cave, the sides considerably convex, especially on the front half, the hind 

 margin very broadly convex. Scutellum longer than the thorax, scarcely 

 los tapering on the apical than on the basal half, the apex rounded, half 88 

 In i Mil as tin 1 base, the \\linli- about as long as the breadth at bast'. Teg- 



