February, 1881 .] 
193 
many of the cross-veinlets of the fore-wing conspicuously bordered with sanguineous, 
their borders more or less confluent, so as to form irregular blotches. Abdomen 
discoloured, varied with sanguineous above; belly ochraceous. Seta? pale ochraceous 
or whitish, with joinings more or less sanguineous or hlaekisli-sanguineous, with 
which colour the forceps also are, in some measure, tinged. 
dhe markings of the ? are less distinct than those of the $ . 
Long, al., 11 — 12, $ 16; corp., J 13, £ 16; set. $ 25 and 1 — 26, and 1mm. 
ILab. : Lahat (Leyden Mus.). 
The professedly temporary groups ranked provisionally with 
Leptophlebia in 1871 , may be dealt with as follows : — 
-4- — Hind-wings somewhat arcuate in front (Trans. Ent. Soc. London, 1871, 
pi. iv, 20a and 264). Basal joint of the $ fox*ceps many times longer than the 
remainder taken together. 
Blastukus, n. g. 
Two long caudal setae, the other abortive ; lateral setae in J about 
three times, in $ about one and a half as long as the body; median 
seta about one-fifth as long as it. Pore tibia of B scarcely longer 
than the femur the tarsus about one and three-sevenths as long 
as the femur ; ungues of posterior tarsi dissimilar. Type, B. cupidus 
(in Ephemera ), Say. Syn., Leptophlebia , ser. 4, Etn., 1871. Distrib., 
Temperate IN’. America. 
Leptophlebia, Westw. (restrict.). 
Three long, sub-equal caudal setae ; lateral setae of $ about one 
and a half times as long ; of ? nearly the same length as the body. 
Pore tibia of g scarcely longer than the femur, but the tarsus nearly 
one and a half times as long as it ; ungues of hinder tarsi dissimilar. 
Nymph with seven pairs of double tracheal branchiae, each one bi- 
partite w r ith subulate divisions distantly beset with minute hairs. 
Type, L. marginata , Lin. Syn., Leptophlebia , ser. 3, Etn., 1871. 
Distrib., Northern Temperate Begions. 
Atalophlebia, n. g. 
Three long, sub-equal caudal setae (or in individual specimens 
sometimes only two), in the $ usually twice as long as the body. 
Normal species : fore tibia of $ about one and a half times as long as 
the femur (in ? scarcely longer than it), and the tarsus about one 
and four-elevenths as long as the femur. Hind tarsus about half as 
long as the hind tibia; its ungues alike in shape, uncinate. Ex- 
ceptional species : some Cingalese species have setae three times as 
long as the body, the $ fore tarsus one and three-sevenths as long as 
