EPHEMEROIDEA. PLATYZYG^EtfA. 243 



basal and three terminal segments black above, green below, the 

 third, fourth, and fifth segments bright yellow. Wings hyaline 

 the veins and margins black ; fore wing with some yellow at base. 

 Femora and tibiae metallic green ; tarsi white. 



Hob. Matelei, Burma (Fea). Exp. 28 millim. Type in Mus. 

 Genova. 



Genus PIAROSOMA, nov. 



Type, P. albicinctum, Hmpsu. 

 Range. Burma. 



c? . Thorax and abdomen stout ; branches of antennae short. 

 Pore wing with the apex somewhat truncate and outer margin 



Fig. 160. Piarosoma albicinctum, 



rounded ; vein 2 from lower angle of cell ; 9 and 10 stalked. Hind 

 wing broad, with veins 2 and 3 from a point near angle of cell. 



510. Piarosoma albicinctum, n. sp. 



3 . Blue-black ; collar and first segment of abdomen white ; the 

 other segments slightly fringed with white. Wings whitish hya- 

 line ; the veins black. Fore wings with the apex and outer and 

 inner margins, the cell, and streaks along veins 2 and 11, and for 

 a short way from margin along 5 broadly black. Hind wing 

 with the black margin dentate at vein 2. 



Hab. Bernardmyo, Burma, 6000 feet (Doherty). Exp. 36 millim. 

 Type in coll. Elwes. 



Genus PLATYZYGJENA. 



Platyzygaena, Swinh. Cat. Het. Mus. Oxon. p. 59, ined. 



Type, P. molleri, Elw. 



Range. Sikkim ; Assam. 



$ . Antennae simple. Palpi very minute. Thorax and abdo- 

 men stout ; wings broad ; fore wing with veins 8 and 9 stalked ; 

 hind wing with all the veins from the cell. 



511. Platyzygaena molleri, Ehc. P. Z. S. 1890, p. 385, pi. xxxii, 



fig- 13. 



$ . Head, thorax, and abdomen blue-black, the last with white 



