EEV. A. E. EATON ON EECENT EPHExMERID.E OE MAYFLIES. 241 



? (dried). — Notum more of a brown-oclire than in the other sex, whence an approach 

 in general appearance is made to E. torrej/tiiiM 2 ; but the ventral markings of 

 K alpkola S conform to those of the 6 and suffice to distinguish the species. The 

 pterostigmatic region of the fore wing is only slightly tinted with bistre-grey. Length 

 of body, 6 12-14, ? 13-14 ; wing, s 11-16, ? 15 ; setge, 6 im. 36-44, 2 im. about 

 33 mm. 



Rab. The Bernese Oberland, and from the Pennine to the Ehaetian Alps, at altitudes 

 of about 3000-6000 ft. Switzerland : Meyringen, near the Alpbach (M°Lach.) ; a torrent 

 between Champery and Tervin, Valais (4500 ft. 14 August, 6 p.m., water 50- E.) ; the 

 St. Gothard (jVPLach.). Savoie : les Contamines (about 4000 ft) ; Chamounix (M^Lach.). 

 Italy : Macugnaga, Val Anzasca (about 5000 ft., M'Lach.) ; the Oglio, in Val Mazza, near 

 Ponte di Legno (5800 ft. 29 July, 5 p.m., water 49 P.). 



Epeoetjs toruentium, Etu. Plate XXIV. 44 a (legs & penis) & LVI. (nymph). 

 Epeorus [type] toirenfhcm, ! Etn. Eut. Mo. Mag. xviii. 26 (1881). 



Subimago [licing). — Wings cinereous with olivaceous or bistre-brown longitudinal 

 nervures and dark-edged black cross veinlets. Fore legs piceous ; hinder legs olive- or 

 bistre-brown with black tarsi. Eyes blackish green. Setee blackish with opaque joinings. 

 (Dried.) — Wings light bistre-grey in opaque view, with raw-umber longitudinal 

 nervures, and black cross veinlets narrowly margined with light grey ; the wing-roots 

 lighter. 



Imago (dried). — d . Notum light brown-ochre, sometimes modified posteriorly with 

 faint traces of light bistre. The ventral markings form a continuous series of spots 

 diminishing in breadth inversely with the lengthening of the segments : in d the spot 

 in segment 5 is narrowly spathulate, those in segments 7 and 8 are sublineai-, that in 

 segment 3 broadly pyriform, and that in segment 2 almost semicircular ; the usual pairs 

 of pale dots or spots are distinct as well as the three or four tine dark lines alongside of 

 the nerve-trunks. In dorsal segments 2-8 the terminal margin is dark excepting at the 

 pleurge and in close proximity to them ; the dark colouring, leaving the hinder angles of 

 the segment pale, is suddenly produced forwards in a curve from the said margin to the 

 scar of the nymphal tracheal brauchia, and, distinctly skirting the upper and the front 

 edges of the scar, either terminates in the pleura at about the middle of the segment, 

 short of the actual edge, or (in some examples) is very faintly traceable beyond that up 

 to the place of the branching-off of the dorsal segmental trachea ; in 2 the edges of the 

 said branchial scars are dark all round. Eore leg in opaque view : — femur pitch-black 

 lengthwise below and either light bistre or dvill rufo-piceous above ; tibia and tarsus 

 aitch-black or pitch-brown : in transmitted light the femur becomes translucent piceous, 

 :he tibia and tarsus or sometimes only the tarsus bistre-brown. Hinder legs in opaque 

 new dull yellowish brown, with the tarsi in some lights dull reddish brown, and with an 

 U-defined blackish band nearly in the middle of each femur ; in transmitted light the 

 irevaihng colour is an impure pale brownish amber, the ungues and the distal edges of 

 he tarsal joints, however, remaining opaque and brownish. Wings vitreous; the 

 )terostigmatic region of the fore wing almost imperceptibly tinted with greenish grey : 



