HEMIPTEKA— HETEROPTBRA— PENTATOMID.^. 449 



Outer anterior angles of the thorax well rounded, the sides considerably oblique, so that the apical is 

 much shorter than the basal margin of the thorax. 

 Head broader than long. 



Thorax less than twice as broad as long :!. T. pcrennatua. 



Thorax more than twice as broad as long 4. T. limomis. 



Head longer than broad 5. 2". macer. 



1. Tjilibomenus PETREUS. 



Head moderately large, about a third as broad as the thorax. Tho- 

 rax rather more than twice a.s broad as long, the lengtli of the apical not 

 greatly less than the basal margin, since the sides do not greatly taper and 

 the outer anterior angles are prominent : apical margin with a very gentle 

 and very broad emargination ; the surface even and very tinely punctate. 

 Scutellum moderate, sharply and regularly triangular, about two-thirds as 

 broad as the thorax, broader than long, extending much less than half-way 

 to the tip of the abdomen. Hemelytra with the corium hardly reaching the 

 middle of the apical half of the abdomen, heavily punctate in serial rows. 

 Tibiae strongly but not very densely spined. Al>domen very full and 

 rounded, fully as broad as long. Color black, the corium of hemelytra 

 very dark castaneous, the membrane infumated. 



Length, 4™™ ; breadth, 2.25"™. 



Florissant. Two specimens, Nos. 5557, 6613. 



2. Thlibomends parvus. 



PI. 19, Fig. 23. 



Head small, hardly more than a fourth as wide as the large thorax. 

 The latter scarcely twice as broad as long, with nearly straight, scarcely 

 oblique sides and prominent outer anterior angles, so that the thorax tapers 

 but little, the length of the apical being but little less than that of the basal 

 margin. There is a slight and short rounded emargination on the anterior 

 border, and the surface is even and very shallowly punctate. Scutellum 

 similarly punctate, very short, not nearly reaching half-way to the tip of 

 the abdomen, and hardly more than three-fifths as broad as the thorax. 

 Hemelytra, with the corium. easily reaching the penultimate abdominal 

 segment, more coarsely punctate. Abdomen very broad and rounded, not 

 nearly so long as broad. Of a uniform, griseous color. The parts in front 



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