418 TERTIAllY INSECTS OF NORTH AMERICA. 



fi^rauulate ; eyes very small, globular. Thorax very coarsely and distantly 

 granulate, perhaps a little longer than the head and certainly broader than 

 long. Hemelytra scarcely showing any veins in tlie corium, which is pale 

 fuliginous, edged with dark fuscous, and with a large round fuscous spot 

 just before the middle of the membranal margin ; the membranal margin 

 itself infuscated at its two extremities ; membrane more deeply fuscous, 

 especially toward the base and on either side, with numerous veins arising 

 from a transverse vein following the membranal margin ; the extremity of 

 the corium is far before that of the abdomen, which is barely covered by 

 the membrane. 



Length of body, 9.65"™ ; breadth, at least 3""°. 



This species, being preserved only upon a side view, can not be defi- 

 nitely referred to this genus ; but as it agrees better with it than with any 

 of the others and does not furnish character's sufficient for clear generic 

 separation I have preferred to leave it in this place. 



Florissant. One specimen, No. 5633. 



Subfamily ALYDIN^E Distant. 



Although when compared to the other Coreidse, this subfamily is to-day 

 but poorly represented in America, whether in temperate or tropical regions, 

 this was not the case in Tertiary times, for it was fairly well furnished with 

 genera and species, and as for numbers in individuals no group of Heter- 

 optera could compare with it. Most of the eight genera are " extinct types 

 and belong to the division of Micrelytraria in the immediate vicinity of Pro- 

 tenor and Dai'mistus, with slender and unarmed hind femora, but also, as a 

 general rule, with distinctly though delicately and profusely spined hind 

 tibiae. One genus, Rhepocoris, contains the bulk of all, and of the four or 

 five species belonging to it nearly all the specimens obtained belong to two 

 closely allied forms, possibly to be regarded as only one. In Europe but 

 three fossil Alj^dina? have Ijcen recognized, and these have all been referred 

 to the division Alydaria. One from the brown coal of the Rhine is irrecog- 

 nizable at present, but was referred by Germar to Alydus ; a second from 

 Oeningen is a true Alydus ; and a third, also from Oeningen but unde- 

 scribed, was compared by Heer to Alydus lateralis, now placed in the 

 neighboring genus Camptopus. 



