E. H. Sellards — Types of Permian Insects. 165 



mination of the basal one-third or one-fourth of the wing. 

 Media divides just in front of, opposite, or just back of the 

 origin of the sector. Its subsequent divisions are variable with 

 the different species. Cubitus divides in front of the division 

 of the media. Its first division is variable ; the second is 

 uniformly simple. The anal area is marked off by a thin line 

 and is traversed by two veins. The cross veins are numerous 

 although not always well preserved. The specific characters 

 are taken for the most part from the median and cubital areas. 



Artinska clara sp. n. Text figure 25. 



The radial sector is deeply bifurcate. M t is simple. M 2 is 

 deeply forked. The first division of the media occurs in front 

 of the origin of the sector. Cu 3 is branched. Cu 2 is simple. 



Length of front wing, 10 mm ; width, 3f min . Type, No. 115. 



Artinska medialis sp. n. 



The media divides in front of the origin of the sector. The 

 sector is shallow forked. M a and M 2 are both deeply forked. 

 The first division of the cubitus is simple. 



Length of wing, 9 mm ; width, 3J mm . Type, No. 1381. 



Artinska gracilis sp. n. 



The sector is not deeply forked. M x is shallow forked ; M 2 

 more deeply forked. Media divides opposite the origin of the 

 sector. Cu, is three branched. 



Length about 9 mm ; width, 3i mm . Type, No. 1090. 



Artinska pecta sp. n. 



The sector is not deeply forked. Media divides in front* of 

 the origin of the sector. M x and M 2 are deeply forked. 'CUj 

 is three branched. 



Length of front wing, 10 mra ; width, 3-| min . Type, No. 1087 ; 

 paratypes, Nos. 437 and 1068. 



Explanations of Text Figures 15-28. 



Fig. 15. Estadia elongata gen. et sp. n. Front wing. No. 1112. 



Fig. 16. Delopterum minutum gen. et sp. n. Front wing. No. 264. 



Fig. 17. Delopterum latum sp. n. Front wing. No. 94. 



Fig. 18. Hind wing, probably of one of the Lemmatophoridse. No. 1461. 



Fig. 19. Hind wing, probably of small species of Estadia, or related 

 genus. No. 758. 



Fig. 20. Delopterum elongatum sp. n. Front wing. No. 61. 



Fig. 21. Lisca minuta gen. et sp. n. No. 916. 



Fig. 22. Prisca fragilis gen. et sp. n. No. 128. 



Fig. 23. Orta ovata gen. et sp. n. Front wing. No. 295. 



Fig. 24. Lemmatophora typa gen. et sp. n. Front wing. No. 1162. 



Fig. 25. Artinska clara gen. et sp. n. Front wing. No 115. 



Fig. 26. Leeorium elongatum gen. et sp. n. No. 524. 



Fig. 27. Stemma elegans gen. et sp. n. Front wing. No. 31. 



Fig. 28. Lectrum anomalum. Front wing. No. 173. 



Figures 15, 18, 19, and 26 enlarged five times ; all other illustrations four 

 times natural size. 



Am. Jour. Sci. — Fourth Series, Vol. XXYII, No. 158. — February, 1909. 



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