358 TERTIARY INSECTS OF NORTH AMERICA. 



World (Europe and Africa) than in the New, but a single specimen from 

 Florissant seems to be referable here better than elsewhere. 



PlESMA? ROTUNDA. 

 PL 23, Fig. 6. 



A single insect, poorly preserved, and showing a dorsal view is dubi- 

 ously referred here ; if correctly, then the extreme convexity of the costal 

 area of the hemelytra is characteristic of the species, as I find no modern 

 type with so rotund a form. The head projects considerably in front of the 

 eyes in two parallel processes nearly as long as the rest of the head ; the 

 head is only a little narrower than the quadrangular thorax, which is nearly 

 a third broader than long and tapers slightly forward. The abdomen is 

 subcircular. The legs and head appendages are not preserved, but the 

 hemelytra slightly surpass the abdomen, and the membrane, which occu- 

 pies about a third of them, is filled with very faint and very large cells, 

 through the meshes of which three or four oblique veins pass to the margin; 

 the costal margin is followed immediately by a slight vein connected with 

 the costa by feeble cross-veins, making subquadrate cells. 



Length of body, 3.5 mra ; including hemelytra, 3.75 mra ; breadth of thorax, 

 l mm ; abdomen, 1.65 mm . 



Florissant. One specimen, No. 7617. 



MONANTHIA St. Fargeau and Serville. 



As stated under the family, two species of this genus have been found 

 in the European Tertiaries, one at Oeningen and the other at Krottensee, 

 and were so referred by their describers. They differ considerably from 

 one another, and the species we add here differs as much from each as they 

 from each other. The characteristic features of the Oeningen species are the 

 long antennae, which are as long as the width of the closed hemelytra, and 

 the very narrow head; of the Krottensee species (which seems to ap- 

 proach M. quadrimaculata Wolff sp. and M. wolftii Fieb., both of Europe; 

 see the figures by Snellen), the sinuous costal margin of the hemelytra and 

 the sinuous narrowing of the thorax ; and of the Florissant species the at 

 first biseriate, afterwards triseriate, arrangement of the reticulation of the 

 costal area, and the tumid form of the regularly tapering thorax combined 

 with tlui broad head. 



