SCUDDER ON FOSSIL INSECTS. 773 



ins, but is unsatisfactory ; tbe costal border is gently and regularly con- 

 vex, tbe tip well rounded, with no projecting apex ; the tegmen appears 

 to increase very slightly in size to a little beyond the middle, up to 

 which point the borders are nearly parallel ; the course and branching 

 of the uervures, so far as they can be made out, seem to indicate an 

 insect allied to Cixius, but no cross-veins can be seen. 



Length of tegmen 6.2"""; its greatest breadth 2.5"^™. 



Mnemosyne terrentula. — A single specimen (No. 31*^) is preserved, wita 

 an indistinct body, broken in front, and the greater part of one of the teg- 

 mina, which show it to be very closely related to, if not a member of, this 

 genus. The body is moderately broad, ovate, the tip of the abdomen 

 rounded and slightly produced. The tegmina are regularly enlarged 

 toward the apex and rounded at the extremity, not at all truncate j the 

 interior branch of the radial vein forks near the middle of the wing, and 

 just beyond the first subapical transverse vein ; both its branches fork 

 before they have passed more than half-way to the marginal row of elon- 

 gate cells. 



Estimated length of body 6.5™% breadth of same 2.25™™; length of 

 tegmina 7™™, breadth of same 2.25™™, their extent beyond the abdomen 



O Omm 



(Tkopiduchida.) 



LitJiopsis [XiOoq^ o(pc<;), nov. gen. 



Body oblong, stout, and apparently cylindrical anteriorly, tapering 

 and probably compressed posteriorly. Head broad and short, the front 

 not produced beyond the eyes, broad, transverse, very gently convex. 

 The united thorax and scutellum of about equal length and breadth. 

 Tegmina surpassing considerably the tip of the abdomen, two or three 

 times as long as broad, beyond the middle barely tapering, the sides 

 subequal, tbe tip obliquely subtruncate, tbe apex rounded, the costal 

 margin gently convex ; marginocostal area broad, broadening regularly 

 toward tbe apex, and throughout its length traversed by very frequent 

 transverse veinlets, which become more and more oblique toward the 

 apex of the tegmina, where they are supplanted by tbe similarly close 

 branches of the longitudinal veins ; these are united at tbe origin of the 

 forks by transverse veins in continuity with the costa itself. The radial 

 vein is branched at the base of tbe tegmina, the inner ulnar vein at 

 some distance before the middle of the wing; and both branches of this 

 vein, and the lower branch of the radial, fork again at half the distance 

 from the first fork of the inner ulnar vein to tbe tip of the wing, but 

 they are not connected at this point by transverse veins. Wings as 

 long as tbe tegmina. 



This genus seems to belong nearest the South American genus Alcestis 

 Stal, but differs decidedly from it in the form of the tegmina, the ab- 

 sence of oblique inferior ramuli to the inner ulnar vein, and the struc- 

 ture of the head. 



