450 TERTIARY INSECTS OF NORTH AMERICA. 



of the head and following the coriuin of the hemelytra on the plate are for- 

 eign to the specimen, which is not well represented there. 



Length, 3 25 mm ; breadth, 2.25 mra . 



Florissant, One specimen, No. 4552. 



3. THLIBOMENUS PERENNATUS. 



Head very regularly rounded, considerably broader than long, about a 

 third the width of the thorax. The latter is a little less than twice as broad 

 as long, with tapering arcuate sides, the outer anterior angles well rounded 

 but tolerably prominent, the apical border gently emarginate for a distance 

 about equal to a third of the b:is<.> of the thorax. Scutellum rather small, 

 hardly more than half as broad as the thorax, and shorter than broad, 

 extending not nearly half-way to the tip of the abdomen, the surface and 

 that of the thorax even, with the faintest and shallowest possible punctua- 

 tion. Cori um of the hemelytra hardly reaching the middle of the apical 

 half of the abdomen, very sparsely and rather faintly punctate. Abdomen 

 broadly semiovate, of equal length and breadth. Color a uniform testaceous 

 where the pigment is not removed. 



Length, 4 mm ; breadth, 2.-_ ) .V 1 "". 



Florissant, One specimen. No. 7841. 



4. THLIBOMENUS LIMOSDS. 

 PL 28, Fig. 12. 



Head precisely as in the last species. Thorax trapezoidal, a .ittle 

 more than twice as broad as long, with rather rapidly tapering sides, the 

 apical about three-fourths the length of the basal margin, the former almost 

 truncate, with the faintest possible arcuation throughout, the surface of the 

 thorax even, faintly and finely rugulose. Scutellum obscure in the only 

 specimens seen, but apparently large and triangular, and extending half- 

 way to the tip of the abdomen. Cori u in occupying about three-fifths the 

 hemelytra, serially and distinctly punctate. Abdomen well rounded, but 

 distinctly longer than broad. Color blackish fuscous, the eorium of heme- 

 lytra fu sco-testaceous. 



Length, 4.5 ram ; breadth, 2.6 mm . 



Florissant, Two specimens, Nos. 5723, 13583. 



