402 TERTIARY INSECTS OF NORTH AMERICA. 



1. TiROMERUS TOEPEFACTUS. 



Sides of body nearly straight and enlarging slightly from the head to 

 the middle of the abdomen Head about twice as broad as long, the front 

 roundly produced in fi-ont of the eyes. Antennae very slender, extending, 

 if stretched along the body, beyond the commissura. Rostrum extending 

 to the middle coxae. Thorax flat, gently tapering, with hardly any fullness, 

 the length about two-thirds the breadth, its breadth at apex five-sixths that 

 at base, the angles scarcely rounded, the front margin roundly, regularly, 

 and slightly emarginate, the surface faintly wrinkled transversely. Heme- 

 lytra with the corium reaching the middle of the abdomen, apparently 

 almost clear, but for a costal thickening of a testaceous color. 



Length, 3""; breadth of base of thorax, 1.3""" ; length of antennae, 2°"". 



Florissant. One specimen, No. 1214. 



2. TiROMERUS TABIFLUUS. 



Whole body of a very regular oval shape, the largest end posterior. 

 Head about half as broad again as long, the front angularly produced but 

 with the extreme front well rounded ; rostrum reat'.hing at least the fore 

 coxse, and apparently the middle pair ; only the basal part of the antenuiB 

 preserved. Thorax- almost flat, distinctly and considerably tapering, but 

 short, with full sides, a little more tlian twice as broad as long, the apex 

 about three-fourths the width of the base, the front margin roundly, regu- 

 larly, and not slightly emarginate, the surface faintly and finely punctate 

 Hemelytra with the corium not extending beyond the middle of the abdomen 

 or hardly reaching it, the membraual suture transversely oblique, the corium 

 apparently clear. 



Length, 3.25°""; breadth in middle of body, LS""". 



Florissant. One specimen, No-. 2475. 



16. LITHOCHROMUS gen. nov. {\{9o?, xpcs/xa). 



Head moderate, rounded subtriangular, of about equal length and 

 breadth, the front distinctly angulate, the eyes small and globular, situated 

 in the middle, away from the base ; antennae nearly or quite half as long as 

 the body, the last joint scarcely or not incrassated ; the first joint just or 

 barely surpasses the front, the second is long and slender, and with the first 



