184 EEV. A. E. EATON OX EECENT EPHEMEEID^ OR MATELIES. 



pterostigmatic space, but this contaius 3-5 simple and usually straight cross veinlets, 

 and sometimes rudiments at the costa of 2 or 3 others interspersed between these ; in 

 the ? there are about 6 before the bulla, and 10 with a few rudiments beyond it. The 

 interval between the basal joints of the forceps-limbs in the 6 is moderately wide, and 

 behind [or above] it is a dark minute subconical point [penis ?] ; the terminal joints of 

 tlie forceps-limbs are proportionally shorter than in other European species. 



d . Variation 1. Turbinate eyes dull light reddish, or reddish clove-brown, above ; at 

 the sides sulphureous or flavescent : lower eyes traversed by a dark line ; above it either 

 brown-black or greyish clove-brown, with a movable dark spot ; below it and towards 

 the orbit paler. Notum pitch-black or jet-black. Dorsum either piceous or fiiscous or 

 rufo-fuscous throughout, with the distal edges of the segments narrowly ochraceous or 

 whitish; or else only so in segments 7-10, and in segments 2-6 partly translucent, each 

 of these segments being whitish or cinereous towards the base and of the prevalent 

 ground-colour distally, the dark colour extending forwards as a triangular projection on 

 each side almost to the base of the segment, and sometimes also as a tapering streak in 

 the middle of the back ; venter dark cinereous with whitish joinings, usually marked 

 with two longitudinal linear stripes in every segment excepting the last ; but these stripes 

 are sometimes reduced to mere spots in the joinings. Setae white or greyish white, with 

 black joinings and annulations, the latter often coinciding with every alternate joining 

 towards the base of the seta, and with every fourth or fifth joining afterwards, but 

 sometimes the alternation is uniform throughout. Legs variable in colour : the fore 

 legs either dull Avhitish tinged with cretaceous in the distal portion of the femur, and 

 with cinereous in the tibia and tarsus ; or with the femur greenish grey and the tibia 

 and tarsus blackish grey ; the femur in either case has a rufescent spot or a pitch-brown 

 annulation near its distal extremity : hinder legs whitish or cretaceous, the femoral 

 marking often indistinct, the distal edges of the first, second, and third tarsal joints (or 

 sometimes the whole of the third joint) and all but the extreme base of the fourth joint, 

 black or dark grey. Wing-neuration sometimes almost colourless excepting at the 

 wing-roots, usually piceous. Forceps cinereous, with the proximal joint fuscous. 



d . Variation 2. Differs from the preceding chiefly in being below the average in size, 

 and in having segments 2-7 of the dorsum greyish anteriorly and rubiginose at the tips, 

 with a triangular streak recurrent on each side from every dark apical border. 



Hab. Belgium. 



d . Variation 3. Turbinate eyes bright yellow (Jlaviis). Tergum of thorax brown- 

 ochreous, the peak of the mesonotum light yellow-ochreous preceded by a pair of short 

 brown-purple dashes tapering forwards. Abdomen in segments 2-7 translucent white, 

 with some fine linear streaks along the spiracular line, a spot on each side of the dorsum 

 of the 5th segment, a corresponding tapering stripe on each side of the 6th segment 

 meeting a narrow half-effaced marginal band lying along the middle of the distal edge of 

 the segment, a trifid spot on the 7th segment formed by a more strongly marked cor- 

 responding band and lateral stripes in conjunction with a median longitudinal stripe, 

 the stripes extending to the base of the segment, and all but the extreme lateral portions 

 of the dorsum in segments 8 and 9, Indian red ; the 10th segment and the 9-7th ventral 



