74 Rev. A. H. Eaton’s Monograph 
quatuor supra habent, infraque lineas duas ; strigis inter- 
mediis duabus anteriora segmentorum carent. Forfex 
lutea, juncturis atris vel piceis. Sete fuliginose, junc- 
turis obscuris. 
Q y.s.s. Simillima, sed mari pallidior. 
Long. corp. ¢ 16-17, ¢ 16; al. g 14-15, 9 16; 
set. ¢ 23, subim. 17, ? im. 14mm. 
Hab.—Moscow (Oul.) ; Germany (Burm.); Switzer- 
land and North Italy. In lakes; the end of July, and 
August. 
Ephemera immaculata, n. sp. 
(Forceps, Pl. IV. fig. 10.) 
Imago, v.s.s. ¢. Thoracis tergum brunneo-luteum. 
Pedum antici picei, femoribus bases versus pallidioribus ; 
posteriores brunneo-testacei. Ale vitrins, immaculate ; 
antic areis submarginalibus, posticee apud margines 
terminales, fuliginoso tinct; nervi obscuri. Abdomen 
fuscum, apicibus segmentorum lineisque spiracularibus 
saturatioribus. Sete umbrine, invarie. 
Long. corp. ¢ 10°5, al. 11 mm. 
Hab.—Cuna, Hindostan. 
In the Oxford Museum. 
Ephemera exspectans. 
Potamanthus exspectans, Walk. 1860. 
Subimago, v. s. s. Ale pallide furfurose, nervis 
transversalibus purpureo-brunneis. Tergum thoracis 
fulvescens, strig’ utrinque fusci. Abdomen lineis longi- 
tudinalibus tenuibus atris, supra quatuor, infra duabus. 
Sete olivaceo-lutez, juncturis fuscis. Pedes lurido- 
ochracel. 
Long. corp. ° subim. 11, al. 14 mm. 
Hab.—Hindostan. 
Ephemera fasciata. 
(Genitalia maris, Pl. IV. fig. 11, 11a.) 
Potamanthus fasciatus, Hag. 1858. 
Subimago, v. s. s. 9. Ale cervine ; antice nervis 
transversalibus atris, paucis in area marginali juxta sub- 
