E. II Sellards — Types of Permian Insects. 351 



upper branch. The media divides early and turns abruptly 

 toward the inner border at the point of division ; the inter- 

 polated vein arises from the upper branches very close to the 

 fork. Cubitus branches very tardily as compared with other 

 genera of the family. The wing membrane is not strongly 

 corrugated ; the cross veins are uniformly and regularly placed. 

 Length of wing, 16 l/2 mm ; width, 4 or 4 l/2 ram . 



Rekter (?) extensus sp. n. Text figure 5. 



The species illustrated by text figure 5 is placed doubtfully 

 in the genus Rekter. The part of the front wing seen is 

 strongly arched. The wings are probably longer than are the 

 wings of H. arcuata, and the median branch of the sector is 

 much more deeply forked. The terminal seven segments of 

 the abdomen are preserved. The abdomen is very slender, 

 the segments much longer than wide. The cross veins of the 

 wing are somewhat more numerous than those of the type 

 sjDecies of the genus. The hind wing of the specimen illus- 

 trated has suffered lateral crushing, obscuring the venation in 

 the central part of the wing. 



Length of front wing, estimated, 16 or 17 mm ; width, 4 to 

 4 l/2 mm . 



Dromeus obtnsus gen. et sp. n. 



The genus Dromeus is proposed for a small Ephemerid of 

 this family. The wing is corrugated, the cross veins numerous 

 and regularly placed. The middle branch of the sector is 

 deeply forked, the interpolated vein attached to the upper 

 division. The wing of the tj^pe species is much smaller than 

 that of any other described species of the family. The genus 



Explanation of Figures. 



Fig. 5. Rekter extensus sp. n. Apical parts of the wings and the terminal 

 segments of the abdomen preserved. The abdomen is unusually slender. 

 The forceps are slender. Two segments of the forceps are seen. The abdomen 

 is viewed from the side. The wings are but slightly longer than the abdomen. 

 Enlarged 4 times. 



Fig. 6. Rekter arcuatus geu. et sp. n. The basal attachment of the radial 

 sector is obscured. The second anal is displaced, lying across the first anal. 

 Enlarged 4 times. 



Fig. 7. Bantiska elongata gen. et sp. n. A genus with wings strongly 

 corrugated and resembling in general form the Odonates. The radial sector 

 is, as a result of lateral crushing, crowded close to Ei, obscuring the cross 

 veins. Enlarged 4 times. 



Fig. 8. Protechma accuminatum gen. et sp. n. The wing has suffered 

 slight lateral crashing, bringing the middle veins of the radial sector close 

 together. Enlarged 4 times. 



Fig. 9. Protereisma minus sp. n. Enlarged 4 times. 



Fig. 10. Prodromus rectus gen. et sp. n. The wing membrane, as indi- 

 cated by the jagged line, is broken from lateral crushing. Enlarged 4 times. 



