456 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



LITHOP3IS DUBIOSA, new species. 



Plate 98, figs. 4, 5. 



Tegmen 9 mm. long and 3.7 wide; costa very strongly arched and 

 elevated basally, beyond that straight, even a little concave; costal 

 area in middle about 1 mm. wide, with about five cross veins in 

 1 mm.; veins fuscous, and costal and apical areas suffused with 

 fuscous. The radius branches 1 mm. from base of tegmen. Media 

 branching about 3.3 mm. from base, each of these branches again 

 dividing, the upper about 6 mm. and the lower about 6.5 mm. from 

 base of tegmen. Cubitus branching about 5.3 mm. from base. The 

 anal veins in the claval area unite about 4.5 mm. from base of tegmen, 

 inclosing a pointed cell, the base of which is strongly curved upward. 



U. S. G. S. 105 and (reverse) 106. Roan Mountain, Colorado 

 (Scudder). U. S. G. S. 123 and (reverse) 129, from the same locality, 

 seems to be the same species. 



Holotype.— Cat. No. 67718, U.S.N.M. 



In its general characters this closely resembles the living Corethrura 

 fuscovaria Hope, from the Oriental region (Burma, etc.) . Compared 

 with the fossil L. simillima Cockerell, this differs by the subcosta, 

 terminating about 4 mm. from base, radius branching nearer base, 

 and in the details of the media. The apex of the tegmen is dis- 

 tinctly more produced. It is also distinct from L. Jimbriata Scudder 

 by the narrow costal area and other characters. We were in some 

 doubt whether to consider this a variety of L. simillima, but there is 

 so much difference in the venation that we can only treat it as distinct. 



Scudder, in his account of Lithopsis, states that the two anal veins 

 in the clavus are distinctly separated throughout. As this seemed 

 improbable, and disagreed with our species assigned to that genus, we 

 asked Dr. N. Banks to examine Scudder's types in the Museum of 

 Comparative Zoology. He reports: 



I have examined the specimens of Lithopsis, and can not be sure about termination 

 of the anal veins. In one (probably basis of fig. 36) the first anal appears to run as 

 he shows it beyond where the second anal ends, but I can not trace it to the end, nor 

 see where it ends in the marginal vein, although I think I can make out ending of 

 the second anal plainly. In other specimen the anals look as if more approaching 

 each other, but can not make out ending of either. In one (probably basis of fig. 36) 

 it looks as if marginal vein was forked, so there is probably part of another wing under 

 it. If there is part of wing under the elytron, then what appears as continuation of 

 the first anal may be a vein from this underlying wing. 



THAUMASTOCLADIUS, new genus. 



Tegmen of moderate size, the costa straight beyond the basal third ; 

 costal region broad, with numerous oblique cross veins; radius appar- 

 ently simple, only branching apically; media and first cubitus united 

 to near middle of tegmen, then forking, the lower or cubital division 



