No. 2313. NEW SPECIES OF EOCENE INSECTS— COCKERELL. 241 



LITHOPSIS DELICATA, new species. 



Plate 33, fig. 1. 



Tegmen (the only part preserved), 9 mm. long and 2.80 wide, 

 broadly rounded apically, lower margin faintly concave. Subcosta 

 running parallel with costa, about middle of tegmen 400 n from it, 

 emitting many very oblique veins; radius running parallel to subcosta, 

 a little nearer to it than the subcosta is to costa, about 3.2 mm. from 

 apex of tegmen, bending obliquely upward to meet the subcosta; at 

 the point where radius meets subcosta a straight vein proceeds to 

 the distal margin; from the middle of the oblique end of radius 

 another straight vein goes to the margin, parallel with the first; and a 

 thhd (branchmg near end) continues in a line with stem of radius; 

 below this are nine vems running to margin from the transverse 

 (gradate) line; none of these are branched. 



Eocene shales, back of house at Smith's ranch, "shale of Green 

 River formation with thin beds oil-shale interbedded," near Cathe- 

 dral Bluffs, Colorado. (Winchester and Bennett's 17.3.) 



Hohtype.— Cut. No. 61556, U.S.N.M. 



The tegmen is much narrower than that of L. firabriata Scudder, 

 but agrees nearly with L. elongata Scudder from Green River, Wyo- 

 ming. It differs from L. elongata in the broadening of the apical end, 

 which m the Wyoming species is narrower than the basal. The 

 characters of the venation are not well kno^^ai in L. elongata. It is 

 not impossible that the present insect should be referred to elongata, 

 but the indications are that it is probably distinct. 



Compared with modern genera, it seems to belong to the Issmae 

 or to the Tropiduchinae. It is singularly like the Tropiduchine 

 Vanua vitiensis Kirkaldy, as figured by Kirkaldy. 



LITHOPSIS SIMILLIMA, new species. 

 Plate 33, fig, 2. 



Tegmina about 9 mm. long and 3.9 wide; middle costal region 

 straight; apex very broad and obtuse; subcosta running 0.5 mm. from 

 costa, terminating about 6 mm. from base; apical part of radius 

 sending many long oblique veins to costa; radius on basal half of wing 

 much nearer to radial sector (subradius) than to subcosta; media 

 branching about 3 mm. from base and on one side (but not on the 

 other) the lower branch soon forks again; cubitus forking 4 mm. from 

 base; anal rather abruptly directed downward at level of cubital fork 

 and ending 4.5 mm. from base. 



Ty pe.—V.S.G.S 334. Roan Mountain, Colorado (Scudder). 



Holotype.— Cat. No. 66557, U.S.N.M. 



This may not be distinct from L. fimhriata Scudder, from Green 

 River, Wyoming; but the course of the anal (second anal) is not 

 144382— 20— Froc.N.M.vol.GT 16 



