308 TERTIARY INSECTS OF NORTH AMERICA. 



Gypona cinercia. 

 PL 19, Fig. 4. 



The head and thorax are decidedly darker than the abdomen, and the 

 spread, but crumpled, elytra are scarcely visible as distinct from the color 

 of the stone except for their slightly darker edges. The head is not more 

 than half as broad as the thorax (which shows that it can not strictly fall 

 into Grypona), with small and rather prominent eyes. The elytra are very 

 slender, extending beyond the abdomen, with only slight and feeble traces 

 of neuration, and apparently very tenuous. The wings are a little shorter 

 but broader, and so more ample. 



Length of body, 8.5°"° ; tegmina, 8°"" ; breadth of thorax, 2.5°™. 



Florissant. One specimen, No. 14229. 



JASSUS Fabricius. 



Two species of this genus have been described from the Prussian amber 

 and several others (compared with different existing forms from those with 

 which the former were compared) have been indicated by Gravenhorst from 

 the same source. It appears, however, not to have been recognized in the 

 rocks, and the species here refeiTed to it is too imperfect to be sure of the 

 correctness of the reference. 



JaSSUS? LATEBR.*. 

 PI. 20, Fig. 19. 



The head has much the form of that of Jassus spinicornis from Prus- 

 sian amber; the thorax is very faintly and not very finely nor closely punc- 

 t;ite ; the tenuous and diaphanous tegmina extend a little way beyond the 

 tip of the abdomen, and are apparently almost three times longer than 

 broad ; tliey are traversed by rather distant longitudinal veins, of which five 

 reach the apical margin ; the character of their furcation and anastomosis 

 can not be determined with certainty, but wherever it can be traced appears 

 to agree with the simpler types of Jassus. 



Length of body, 3.5°"°; breadth of same, 1.2"°'; length of tegmina, 



Qmm 



Florissant. One specimen, No. 6639. 



