70 EEV. A. E. EATON ON EECENT EPHEMEEiD^ OE MATELIES. 



extent in the disk, and the whole of the ueuration in the vicinage of the terminal and 

 inner margins, light yellowish, hut the suhcosta and parts of the other nervures adjacent 

 to spots, as well as the cross veinlets in the disk are black ; these cross veinlets also are 

 bordered with black-grey, and the bordering is enlarged here and there into spots as in 

 the imago. Neuration of the hind wing mainly light yellowish, but a few cross veinlets 

 in the basal f of the disk are blackish, though not bordered. 



Imago {dried), s . — Thorax above light reddish brown, approaching brown-ochreous, 

 with a longitudinal pitch-brown stripe on each side of the pronotum. Aljdomen above 

 largely suffused with violet-grey, leaving at the sides of the segments a narrowly 

 limited space of a light yellowish colour ; the usual dorsal streaks are situated within 

 the violet-grey spaces ; their pattern, best seen in segments 6-9, comprises, — a pair of 

 longitudinal linear streaks, one on each side of the dorsal vessel, approximated to each 

 other at the base and blended together posteriorly ; also a large triangular spot as long 

 as the segment on each side, close to the streak and tapering distally, from whose 

 hypotenuse in segments 5-7 a curved streak is prolonged obliquely backwards and 

 downwards ; in addition, the spiracular border of the dorsum in segments 8-9 is 

 narrowly blackish throughout, but in the preceding segments it is blackish only for a 

 short distance from the anterior angle apart from the terminations of the curved streaks 

 described above. Venter very light translucent yellowish, shading into light yeUow- 

 ochraceous in the hinder segments and brown-ochre at the base of the forceps, marked 

 lengthwise with three interrupted narrow pitch-black streaks, — one along the ganglionic 

 track, and another on each side of it almost exactly intermediate between that and the 

 spiracular border, posteriorly dilated in segment 9. Setse light bistre-, or raw-umber 

 grey with pitch-black joinings. In opaque view, the fore coxa and trochanter are light 

 yellowish, the femur light bistre-brown, the tibia and tarsus much lighter, but with both 

 extremities of the tibia, the first tarsal joint, the base of the second and the extremities 

 of the other joints as well as the ungues pitch-black ; the hinder femora are very light- 

 yellowish, the tibiae and tarsi yellowish white, and the ungues light brownish ; in trans- 

 mitted light the fore legs are rich brownish-yellow amber, marked with pitch-brown 

 in the places enumerated above, and the hind legs have the femur very liglit yellow 

 amber, the tibia and tarsus whitish. Wings transparent ; the hiud wings, and the fore 

 wings in the immediate vicinage of the inner margin colourless, these anteriorly becoming 

 gradually tinted more and more with light raw-umber, this tint attaining its greatest 

 depth in the pterostigmatic portion of the marginal area and the whole of the sub- 

 marginal area. Longitudinal nervures and the great cross vein from the costa to the 

 subcosta, in opaque view, light raw-umber or light bistre-brown, changing with light trans- 

 mitted to brownish-yellow amber, or golden brown ; cross veinlets, great cross vein from 

 the subcosta to the radius, and the anterior curves of the branches of the anal (8) nervure 

 of the fore wing black, the veinlets in general edged more or less faintly and narrowly 

 with greyish or with dark bistre-brown, many of those in the disk anterior to the anal 

 nervure having the edging dilated roundly, and others (more broadly margined) esta- 

 blishing through the confluence of their bordering a dark bistre-brown band and spots in 

 the usual situations, viz. : — a transverse curved or angulated stripe from the costa to the 



