EEV. A. E. EATON ON RECENT EPHEMEEID^ OR MAYFLIES. 255 



EUROPEAN SPECIES. 



Rhithrogena borealis, Etn. 



Heptagenia borealis, ! Etu., Trans. Ent. Soc. London (1871) 137, pi. vi. 11 [detail] ; Palmen, Paar. 

 Ausf.-Giinge d. Geschl. Org. b. Insect. 852 (1884) [anatom.]. 



Imago {dried), 6 . — Notum piceous. Abdomen ochraceous, translucent, witli the tips 

 of the anterior segments, in addition to the last three or four segments, light fuscous 

 above. Setse fawn-grey with fuscous joinings. Legs light fuscous. Wings vitreous ; 

 the longitudinal nervures light fuscous. Length of body or wing, d 10 mm. 



Hab. Finmark, between Koutokseino and Karesuando (Walker MS., in Dale Mus.). 



RhITHROGENA NIVATA, Etn. 



Heptagenia nivata, ! Etn., Trans. Ent. Soc. London (1871) 137, pi. vi. 10 [genitalia]. 



Suhimago {living). — Eore wings dark cinereous ; hind wings lighter. Hinder legs 

 olivaceous, with dusky tarsi ; fore legs darker. Setae dull black. 



Imago {lioing), <s . — Eyes sooty black above, tinged slightly with olivaceous below. 

 Notum jet-black. Dorsum of the abdomen fuscous, rather paler by the joinings ; venter 

 olivaceous. Seta? dusky, with the joinings narrowly dark. Fore femur olive-black, the 

 tibia and tarsus black ; hinder femora olivaceous, the tibise dull whitish-olive-grey or 

 cretaceous, the tarsi tinted with olive. Wings uniformly vitreous ; neuration olive-grey. 



5 . Fore tibia and tarsus dusky, very dark ; hinder tibite cretaceous, the tarsi dusky, 

 with pale ungues. Venter olivaceous, with rather darker spots under the ganglia : lobe 

 of the 9th segment slightly emarginate. Length of body 11 ; wing, 6 12, ? 17 ; setse, 

 6 im. 27, subim. 8, S im. 12-15 mm. 



Rab. The Barberine in the Val de Trient (about 3700 ft.) and Lac de Combal (5774 ft.). 



RniTHROGENA ALPESTRis, sp. uov. Plate XXIV. 43 a [genitalia, 6 ]. 



Ehithrogena | semUincta, Etn. MS. in the writing of PI. xxiv. 



Subimago {dried). — Wings very light brownish grey (Cologne Earth grey) with opaque 

 longitudinal neuration ; nearly concolorous with dried examples of Hh. semicolotYda. 



Imago {liclng), 6 . — Eyes fuscescent, or greenish bistre-brown above, traversed by a 

 broad black band, and bluish grey below that band. Notum fusco-piceous. Abdomen 

 above suffusco-piceous, pale by the joinings at the extreme bases of the intermediate 

 segments ; venter fuligineo-fuscous, with pale joinings, tinged in the penultimate segment 

 with burnt-sienna (rubigineous) ; forceps dusky. Sette slightly dusky, with subpiceous 

 joinings towards the roots. Eore leg blackish, with the end of the femur and tibia 

 black ; hinder legs very light greenish grey, with the tip of the femur fuscous above, 

 and the tarsi dusky, with the terminal margins of the short joints black ; trochanters 

 terminated each by a black point; coxa? suffuscous ; mesosternum piceous. Wings 

 uniformly vitreous, with subpiceous neuration : tegulse light yellowish. 



? . Eyes fusco-olivaceous traversed by a moveable black band. Epistoma greyish ; 

 vertex of head piceous, varied with yellowish fuscous. Abdomen lighter than in the s ; 

 segments 2-7, each with a pale dot on each side of the median dorsal line nearly in the 



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