386 TERTIARY INSECTS OF NORTH AMERICA. 



incrassated ; the first joint scarcely surpasses the head, the second is the 

 longest, and the others successively shorter. 



Two species may be separated among the fossils found at Florissant. 



Table of the species of Steiiopamera. 



Corinm of hemelvtra dark with pilliil subcosfal streak .mil median patch 1. S. tenehrosa. 



Corium of liemelytra pale wIdU darkoued iiiarjjcual stripe 2. S. sublerrea. 



1. Stenopamera tenebrosa. 



PI. 23, Figs. U, 24. 



Head rounded subtriangular, of about equal length and breadth, less 

 than half as broad as the thorax at its greatest ; antennae about as long as 

 head and thorax combined. Tliorax witli the sides strongly convex and 

 almost angulate in the middle, in front of which it narrows rapidly, the 

 truncate anterior margin shorter than the length of the thorax and hardly 

 more than half its greatest breadth ; surface nearly smooth, transversely and 

 finely pectinate. Hemelytra with the corium reaching rather beyond the 

 middle of the abdomen, very dark, but not so dark as the thorax, with a 

 distinctly and sharply pallid sutura clavi and pallid streaks, especially in 

 the subcostal region and in the middle of the outer membranal margin, but 

 also often extending from the base outward along the costal margin. 



Length, 3.55°""; breadth of thorax, 1.45°"". 



Florissant. Nine specimens, Nos. 1448, 4597, 57.36, 6217, 6373, 7397, 

 7675, 11301, 12446. 



2. Stenopamera subterrea. 



PI. 23, Fig. 7. 



This species difi'ers from the preceding in no conspicuous feature and 

 agrees with it in size. The front margin of the thorax appears, however, 

 to be a little and roundly emarginate and the sides slightly less prominent. 

 The hemelytra are pallid with a pale testaceous thickening of the costal mar- 

 gin of the corium and a faint line of punctuation along the principal veins. 



Length, 3.25°'™ ; breadth of thorax, 1.2"°^. 



Florissant. Tliree specimens, Nos. 4887, 6140ffl, 7473. 



