EEV. A. E. EATON ON EECENT EPHEMEEID.E OE MAYFLIES. 239 



margin ; the remaining segments darker. Venter traversed lengthwise by a median 

 very light burnt-umber stripe, which in segments 1-7 is dilated more or less broadly, 

 posteriorly, so as to form a series of obovate or obovate-lanceolate spots. Setse piceous, 

 with the joinings of the more attenuated portions opaque. Fore leg piceous, with the 

 basal f of the femur above (like the trochanter) either yellowish brown or rufo-pieeous. 

 Hinder femora {dried) light raw umber or yellowish brown, with a fine very indistinct 

 dark longitudinal streak in the midst ; tibiae yellower than the femora ; tarsi light bistre- 

 brown ; in transmitted light the femur becomes brownish amber, and tlie tibias yellowish 

 amber. Wings vitreous, tinged in the pterostigmatic region of the fore wing with bistre- 

 grey ; neuration piceous, excepting the proximal extremities of the longitudinal uervures 

 posterior to the radius, the costa of the fore wing at the roots, and that of the hind wing 

 in the vicinage of the salient angle. Length of body 14-15 ; wing 16 ; setae, 6 im. 40 mm. 

 Hal). Portugal ; common by a stream from the Estrella, S. of Sabugeiro (4200 ft., 

 10'30 A.M., 7th June, 1880, water 56° F.). In the living insect the tips and median 

 streaks of the hinder femora are blackish. 



Epeorus assimilis, sp. nov. 



Subimago ? [dried). — Wings light bistre-grey, with bistre-brown neuration ; the wing- 

 roots lighter and pale yellowish. 



Imago s [dried). — Notum pitch-black, or pitch-brown in front and pitch-black behind. 

 In each of the ventral segments 3-7 a single broadly obcuneate dark spot contains a pair 

 of ill-defined pale and mostly elongate dots. In dorsal segments 2-8 the terminal 

 margin is dark excepting at the pleurae, the hinder angles of which are of a light colour ; 

 and the dark colouring is produced forwards from the said margin in a curve through 

 the scar of the nymphal tracheal branchia on each side of the segment, terminating 

 thereabouts and not extending to the place of the branching-off of the dorsal segmental 

 trachea. Fore leg piceous, in some lights somewhat rufo-piceous along the upper edge of 

 the femur, but less distinctly so than in E. gemiuus. Hinder femora light bistre-brown, 

 very indistinctly banded with darker in the middle ; tibiae and tarsi in opaque view 

 rather lighter than the femora, but only in a slight degree, with the tarsal joinings 

 brownish and the ungues piceous ; in transmitted light the hinder tibiae are of a yellower 

 amber-colour than the femora. Wings vitreous, tinted slightly, or sometimes strongly, 

 towards the base with light yellov\dsh-green, and tinged with sepia-grey in the pterostig- 

 matic region of the fore wing ; neuration pitch-black, with the same exceptions as in 

 E.geminm. Length of body 14 ; wing, 6 15-16, $ subim. 17 ; setae, S im. 35-45 mm. 



Sal). France and Belgium ; near Pau, in the Neez, al)ove the Pont d'Oly (600 ft., 

 June 4, 1878). Also the Schwarzwald, Baden (M^Lach., end of July 1835), where it 

 occurs at altitudes of 2200-2700 ft. 



Epeorus alpicola, Etn. (restricted). 



Heptaffenia alpicola, ! Etn., Trans. Eut. Soc. London (1871), 148 [excl. Carinthian examples & pL vi. 

 19, detail oi Ecdyurus Zelleri]. 

 Imago [dried). — Notum varying from reddish umlier or Vandyke-brown to rufo- 



32* 



