426 TERTIARY INSECTS OP NORTH AMERICA. 



stout, and does not attain the extremity of the head, but this is only on 

 account of the great prolongation of the same ; the second joint is of extra- 

 ordinary length, being about two and a half times longer than the basal 

 joint, half as long again as the elongated head, and slightly longer than the 

 remaining joints together ; these ai'e subequal, and all the joints are moder- 

 ately slender, the last slightly incrassated if at all, and bluntly rounded at 

 the apex. Thorax shorter than the head and rapidly tapering, so that the 

 apex is only half as long as the base. Abdomen rather stout with {parallel 

 sides. Legs unknown. 



A single species is known. 



Etirocoris infernalis. 



PI. 26, Fig. 16. 



The whole body blackish fuscous, including the antennae ; surface of 

 the head punctate, like the thorax ; these two parts about equal in length. 

 Veins of the corium punctate. 



Length of body, 7.25°"°; breadth of thorax, 3.1'°°' ; length of antennae, 

 6.3°"". 



Florissant. One specimen, No. 9253. 



7. RHEPOCORIS gen. nov. (peTrco, xdpi?). 



This is the commonest form of the Alydinae in Florissant, and is a genus 

 of the Micrelytraria, with unarmed thorax and scutellum and tapering tho- 

 rax, but is remarkable for its spinous hind tibiae, as well as for the characteris- 

 tics of the antennae, by which it is clearly separated from any modern types. 

 The head is well rounded, of about equal length and breadtli as viewed from 

 above. The antennae have a stout basal joint not half so long as the head, 

 the three succeeding joints subequal, slender, the last gently incrassated and 

 fusiform, corresponding in this respect with the bulk of fossil Alydinae. The 

 thorax is trapezoidal, perhaps a little longer than broad, and tapers with 

 straight sides, not in the least full, to the head, forming a slight collar. The 

 legs are moderately stout, the hind femora considerably longer than the 

 others and scarcely stouter, the hind tibiae delicately but profusely spined 

 throughout. 



Five species occur at Florissant. 



