EXPLANATION OF PLATE XX. 



Fig. I. — Wings of Neoperla indica, Ndm, 



2. — Dorsal view of end of male abdomen of same. 

 3. — Wings of Leuctra indica, Ndm. 



4, 5. — Dorsal and lateral views, respectively, of the end of the 

 male abdomen of the same. 

 ,, 6. — The wing of ChlcEon bimaculatwn, Etn. 

 ,, 7. — The wing of Ccenis perpusilla, Walk, 

 ,, 8. — Genital appendages of the male abdomen of Palingenia 



sp.(?). 

 ,, 9. — Forceps limb of the male of Ephemera sp. (?). 

 ,, 10. — Forceps limb of Chlceon bimaculatum, Etn. 

 ,, II. — Dorsal view of the tip of the male abdomen of Embia 



saundersi, West. 

 ,, 12. — The same view of like part in Embia michaeli, McL. 

 ,, 13. — The same view of like part in Embia sp. (?). 



