EEV. A. E. EATOX OX EECENT EPHEMERID.E OE MAYFLIES. 73 



Siiblmago [dried), $ . — Wings fawn-colour, the stronger of tlie longitudinal nervures 

 yellowish, the cross veiulcts of the fore wings black; the submarginal area of the fore 

 wings is tinged with yellowish, and some of the cross veinlets in the marginal area are 

 edged Avith darker towards the sul)costa. 



Imago {dried). — Thorax testaceous above. Abdomen eroded by Psocidaj, but it 

 appears to have been light bistre-brown on the dorsum, with two darker streaks 

 projecting forwards on each side from the darker hinder borders of segments 1-9, 

 subparallel with each other in segments 9-7, but curved sliglitly away from each other 

 towards their anterior exCi'emities in the other segments ; also in at least segments 9-7 

 the dorsal vessel appears as a black line ; on the venter are visible traces of the usual 

 two longitudinal series of discontinuous linear black stripes. Setee medium Mars-yellow, 

 with many of the joinings reddisli brown. Forceps dull yellowish, with the terminal 

 two joints black. Wings transparent, slightly tinted with greyish, with reddish brown 

 longitudinal nervures and piceous cross veinlets ; tlie fore wing in the submarginal 

 area, and the ptcrostigmatic portion of the marginal area, tinged witli madder-brown, 

 and having small spots of a similar colour in the usual places in the midst of the wing — 

 one at the fork of the prasbrachial nervure (6), one close to it on the cubitus (.5), another 

 on the first sector (1), and a dot more distant from the wing-roots than these on the 

 pobrachial nervure (7) ; hind wings similar in the colours of their neuration, but spot- 

 less, and rather faintly clouded very narrowly with reddish grey along the terminal 

 margin. Fore tibia madder-brown, the tarsus rather obscurer, the femur somewhat 

 rufescent; hinder legs light yellow-amber, the tarsus more opaque with red-brown 

 ungues. Length of body, d , 13, wing 11, sette about 21 & 23 mm. 



Sab. Ceylon (Hag. & M'Lacb. Mus.). The ? im. from Masuri, northern India, 

 mentioned by mo in 1S71, is very similar in the pattern of its markings, but perhaps is 

 another species. 



Ephemera seuica, Etn. 



Ephemera serica, !Etii., Traus. Ent. Soc. London (1871), 7.j, pi. iv. 13, 12a [details]. 

 Subimago [dried), $ .—Wings very light yellowish grey, with dull light yellowish 

 neuration ; in the fore wing most of the cross veinlets between the costa and the sector, 

 and many of those posterior to this last nervure in the proximal third of the disk of the 

 wino" are black, a few are also bordered with black, and in the area posterior to the 

 submarginal area 3-5 cross veinlets beyond the bulla are marked each in the middle wjth 

 a round black spot. 



Imago [dried), s . — Head light brown-ochreous, reddish brown in the vicinage of the 

 ocelli. Thorax brown-ochreous, with an elongated black spot on each side of the 

 pronotum. Abdomen pale yellow-ochreous, marked with black lines, shown best in the 

 $ examples. Seta) ochraceous, the two outer annulated irregularly with black. AA'iugs 

 vitreous, the fore wing with the neuration in a larger measm-e golden brown, but with 

 the cross veinlets in advance of the sector, and those behind it in the basal ^ of the disk 

 pitch-black, some of them spotted with warm-sepia-brown in correspondence with the 

 markings of the subimago ; hind wings spotless. Fore femur deep raw-umber brown, 



SECOND SERIES. — ZOOLOGY, VOL. III. 10 



