168 E. II SeUards — Types of Permian Insects. 



Orta ovata gen. et sp. n. Text figure 23. 



The radial sector is bifurcate. Media and cubitus are fused 

 at the base for a distance of one to two millimeters. M x is 

 simple ; M 2 is branched. Cubitus is divided at the point of 

 separation from media. Cu x is deeply forked. Cu 2 is simple. 



Length of front wing, 7 mm ; width, 3 mra . Type, No. 295; 

 paratype, No. 190. 



Stemma elegans gen. et sp. n. Text figure 27. 



The front wings are long and very slender. The sector is 

 simple. Cubitus and media are united for some distance at 

 the base. Cu 2 arises as a branch vein from the united main 

 veins. M x is simple ; M 2 is three branched. Cu, is bifurcate 

 at the tip ; Cu 2 is simple. 



Length of front wing, 10 mm ; width, 2i mm . Type, No. 31. 



Stemma extensa sp. n. 



The front wing is somewhat shorter than that of the type 

 species. Cu a is simple. 



Length of front wing, 8 mm ; width, 2i mm . Type, No. 1272. 



Delopteridas, family new. 



This is a family of small insects. The front wings are nar- 

 rowly elongate. The subcosta is short, rarely reaching beyond 

 the middle of the wing. The radial sector is one to three 

 branched. The cubitus, instead of dividing early into two 

 main branches, continues simple until near the inner border, 

 there giving off one or two thin, simple inferior veins. The 

 anal area is marked off by a thin depressed line. Cross veins 

 are not numerous in any part of the wing. 



The hind wings are of approximately the same length as the 

 front. They are probably expanded and plicated as in other 

 families of this group. 



The body is slender. The abdomen is much shorter than 

 the wings. 



Delopterum minutum gen. et sp. n. Text figure 16. 



These are small insects. The subcosta is short. Radial sec- 

 tor is three branched. Media is two branched. Cubitus is 

 apparently simple. 



Length of wing, 4^ mm ; width, l£ mm . Type, No. 264. 



Delopterum elongatum sp. n. Text figure 20. 



This is a much larger species, and may possibly be found to 

 be generically separable from Delopterum minutum. Cubitus 

 in this species is branched. 



Length of front wing, f mm ; width, 2 ram . Type, No. 61. 



