E. H. Sellards — Types of Permian Insects. 161 



Stoichas arcuatus sp. n. Text figure 14. 



The first division of the media of this species is deeply 

 forked, while the second division is simple. The cubitus is 

 more strongly vaulted and is longer than is the cubitus of the 

 type species. It has five slender branches, the third of which 

 is forked. 



Length of wing, ll£ mm ; width, 3i mm . Type, No. 973. 



Stoichus minor sp. n. 



This species is very much smaller than the type species of 

 the genus. Mediaj is simple ; M 2 is three branched. Cubitus 

 gives off beyond the first strong branch, three inferior 

 branches. 



Length of wing, 9 mm ; width, 3 mm . Type, No. 114. 



Stoichus tenuis sp. n. 



The wings of this species are thinner and the venation less 

 distinct than in other species referred to this genus. The 

 sector arises opposite the division of the media. Cubitus 

 divides very early as in the type species. The offshoot from 

 the cubitus is a thin vein reaching a little beyond the middle 

 of the wing. Two inferior branches are given off, the first 

 of which is forked. The first division of the media is simple, 

 the second is apparentlv once forked. 



Length of front wing, 10 mm ; width, 3 mm . Type, JS T o. 1208. 



Stinus brevi-eubitalis gen. et sp. n. Text figure 9. 



The cubitus of this genus is short as compared with other 

 genera of the family, being scarcely vaulted and reaching but 

 slightly beyond the middle of the wing. Only two inferior 

 branches are given off. The median area is correspondingly 

 well developed. M 2 in the type species gives off three infe- 

 rior branches which fill the apical border. M x is simple. The 

 radial sector arises back of the division of the media, and is 

 simple. 



Length of wing, 12| mra ; width, 4 mm . Type, No. 459. 



Lecopterum delicosum gen. et sp. n. 



This is a genus of small Probnisidse. The wing is slender 

 and not so coriaceous as in other genera of the family. The 

 veins in the apical part of the wing are thin and more or less 

 wavy. Mj is simple. M 2 is three branched. Cubitus divides 

 early. Beyond this first division it has but two inferior 

 branches and is but slightly vaulted. 



Length of front wing, partly estimated, 9 mm ; width, 3 ,nm . 

 Type, No. 824. 



