74 EEV. A. E. EATON ON EECENT EPHEMEEIDvE OE MAYFLIES. 



pitch-black at the kuec ; fore tibia and tarsus light brown-ochre, the femur pitch-black 

 at both extremities ; fore coxa and hinder legs very light yellow-ochraceous, all with a 

 black spot on the coxa. 



$ (dried). — Very like the male; the pronotal spots smaller, the wing-spots very 

 indistinct, almost effaced. Abdomen above in segments 3-9 marked with a pair of sub- 

 parallel line black lines along the middle of the back, interrupted only at the overlapping 

 apical borders of the segments, also with an abbreviated black line on each side along 

 the spiracular border from the posterior angle of the dorsum extending to half the length 

 of the segment, and perhaps with the hinder border of the dorsum black in the middle ; 

 venter in segments 3-7 marked along the middle with tAvo slightly sinuous black lines, 

 and with a greatly abbreviated longitudinal black line from the base on each side at the 

 spiracular border. Legs very light yellow-ochraceous ; the fore femur slightly darker ; 

 its tip, both extremities of the fore tibia, and the proximal joint of the fore tarsus pitch- 

 black ; the flat claw blackish in every tarsus. Length of body, d 11, ? 14 ; wing, d 13, 

 ? 18 ; seta?, $ subim. 17 mm. 



Ilab. China, Hongkong (Brit. Mus.). The subimago in the Museum has no spots 

 on the pronotum. 



Ephemeka oeientalis, M°Lach. 



Ephemera orientalis, ! M'^Lach., Trans. Eut. Soc. Loudon (1875), 168. 



Imago [dried; after M'Laclilan), <s . — Body pale greyish yellow, with a black longi- 

 tudinal streak on each side of the mesonotum, and some blackish markings on the 

 abdomen, viz. — with the posterior borders of the dorsal segments narrowly blackish, also, 

 in segments 4-8, with a black line from the base of each segment extending some 

 distance along the covu'sc of the dorsal vessel and flanked on each side of the dorsum 

 with a pair of slightly curved black linear streaks ; venter marked in the intermediate 

 segments with a longitudinal straight black lino on each side. Setae at the base 

 universally yellowish, afterwards narrowly blackish at the joinings. Eorceps rather 

 short, their last two joints short. Legs pale yellow ; the tibiae and tarsi of the fore legs 

 fuscous. Wings vitreous, with a faint yellowish tint, the hinder spotless, and along the 

 terminal margin rather broadly bordered with pale greyish ; neuration blackish, the 

 cross veinlets of the marginal area incrassate and deep black, the bullae black, and the 

 cross veinlets adjacent to that of the subcosta distinctly bordered with black. Length 

 of wing 15 mm. 



Ilab. Japan ; Von Siebold (Leyden Mus.). 



Ephemera japonica, M'Lach. 



Ephemera japonica, ! M^'Lacli., Trans. Eut. Soc. Londou (1875), 1G9. 



Suhimago {dried), S .—Wings transparent light greenish grey, spotless in one example, 

 the submarginal area of the fore wing clear yellowish green, the terminal margin of the 

 hind wing narrowly edged with greyish, that of the fore wing hardly perceptibly so ; 

 nei;ration mostly pitch-black, but just at the wing-roots brown-ochreous. Setae deep 

 sepia-brown at the base, becoming lighter distally, the joinings not conspicuously darker. 



