166 E\ II Sellards — Types of Permian Insects. 



Artinska major sp. n. 



The sector is deeply forked. Media divides in front of the 

 origin of the sector. M x is simple ; M 2 is deeply forked. Cu r 

 is three branched. 



Length of front wing, ll mm ; width, 4 mm . Type, No. 1375. 



Artinska extensa sp. n. 



The sector is shallow forked. Media divides much in front 

 of the origin of the sector. M t is three branched ; M 2 is 

 simple. Cuj is three branched. 



Length of front wing, 10 mm ; width, 4 mm . Type, No. 28. 



JEstadia gen. n. 



The generic characters may be summarized as an arched 

 subcosta, and a radius which is bifurcate and is fused for a 

 short distance with the first division of the media. 



The front wings are elongate. The subcosta reaches two- 

 thirds of the length of the wing, and is strongly arched at the 

 base. The sector arises 3 or 4 mm from the base and is fused 

 for a short distance with M r Media is divided in front of the 

 origin of the sector. Its subsequent divisions are variable. 

 Cubitus 2 is simple. Cu x is bifurcate. The anal area is of the 

 usual squarose form, and is traversed by two veins. The 

 specific characters are taken, as in the other genera, from the 

 disposition of the veins of the median and cubital areas. 



JEstadia elongata sp. n. Text figure 15. 



The radial sector is fused with M a for a distance of one milli- 

 meter. M, is shallow forked ; M 2 is deeply forked. Cu, is 

 forked. 



Length of front wing, 10i mm ; width, 3i ram . Type, No. 1112. 



JEstadia arcuata sp. n. 



The radial sector is fused with M x a distance of one-half 

 millimeter. M> is shallow forked while M 2 is deeply forked. 

 Cu x is two branched. 



Length of wing, 12 mm ; width, 4J mm . Type, No. 412; para- 

 type, No. 358. 



JEstadia tenuis sp. n. 



The sector is fused with M x a distance of not more than one- 

 half millimeter. M x is simple; M 2 is deeply forked. Cu x is 

 two branched. 



Length of front wing, 9 mm ; width, 3i mm . Type, No. 1382; 

 paratype No. 1274. 



