1(50 TERTIARY INSECTS OF NORTH AMERICA. 



4. INOCELLIA EVENTA. 



One specimen of this species is preserved in which all four wings closely 

 overlapping one another are attached to a partly preserved body sufficiently 

 preserved to judge by the extremity of the abdomen that it was probably a 

 male, and by its long slender and equal prothorax that it did not differ in 

 this respect from I. tumulata. The base of the wings is too obscure for 

 determination, but the course of the veins renders it probable that the 

 central sector, of the hind wings at least, arises in the angle of the basal cell 

 formed by the junction of the radius and its basal branch ; and in the table 

 it has accordingly been placed in that division of the genus. The general 

 features of the neuration show at all events that it is more closely allied to 

 I. tumulata than to any of the others. 



In another specimen the wings are of equal length, the front pair very 

 long and slender, being nearly four times as long as broad, the greatest 

 breadth in the middle of the apical half, although the greater part of the 

 apical half is subequal, the apex well rounded, but slightly produced, the 

 costal margin straight beyond the (obscure) base. The veins of both wings 

 are black. The pterostigma, apparently alike in both wings, is blackish 

 fuliginous, of moderate size, its proximal margin transverse, its distal very 

 oblique, forming a nearly continuous curve with its slightly convex lower 

 margin, the whole a little more than twice as long as broad. The subcostal 

 vein is gentty curved and strikes the costa at the pterostigma's distance before 

 the latter; the space between it and the costa is pretty broad and filled by nu- 

 merous straight oblique veins. Below the radius the cell, whose distal extrem- 

 ity lies just beneath the termination of the costo-subcostal interspace, is excep- 

 tionally long, being nearly double the length of the cell beyond it, and the 

 cells which lie beneath its distal extremity are bordered externally by a com- 

 mon line which lies beneath the proximal end of the pterostigma ; the lower 

 of these two cells being the longer, there is formed an oblique series of large 

 conspicuous areoles like those of modern species but more distant from the 

 apex of the wing. The hind wing differs from the front wing principally in 

 form, the apical half being less equal, and in the shortness of the long sub- 

 radial cell of the front wings, which is no longer than the next outside of it : 

 the series of cross-veins originating above at the middle of the pterostigma 

 is more broken, but falls wholly without the proximal end of the ptero 

 stigma, so that the three areoles form a vertical instead ot'an oblique 



