166 EET. A. E. EATON OX EECEXT EPHEMERIDJ: OE MATTLIES. 



hood of Samoens (3400-5100 ft.) and Champerv (4500—5760 ft.), in streams or torrents 

 having temperatiu-es ranging in August and the beginning of September from 42°-51° T. 

 in the early morning, to 45° and 59° F. (rarely 62°) in the afternoon : also in the Enga- 

 dine at Pontresina and (M'^Lach. 13 August) the Yal de Fain : also (M'^Lach.) in July 

 on the St. Gothard route, Yal Bedi-etta, and at Gex, Ain, &c. ; also Oberseisenthal 

 (Meyer-Diii-) and Yal d'Entremont (Pict. in June). 



Ba£tis AXPEsrs, Pictet. Plate LXIV. 18 (forceps). 



C/o'e alpina, Ret., Hist. Nat. Nevropt. ii. Ephem. 257, pi. xl. .5 (184.3-5). 

 Clo'eon aJpina, Walk., List of Neivropt. Ins. in Brit. Mus. part iii. 574 (1853). 



Baetis amnicus, ! Etn., Trans. Ent. Soc. London (1871) 117, pi. v. 24, 24a [detail]. — B. aJpinua, id., 

 op. cit. (1871) 118 [after Kct.]. 



Imago (living). — c? . Tui-binate eyes chocolate- brown ; lower eyes brown-blact. Xotum 

 jet-black, with pale sutiu'es. Dorsal segments of the abdomen fuscous, slightly paler at 

 the joinings : venter mostly cinereous. Eorceps black at the base, b'ghter distally. 

 Setae white or cinereous, with darker ioinings near the roots. Fore femui- srreenish 

 grey ; tibia and tarsus smoky or dusky ; hinder femora sometimes less of a greenish and 

 more of an ochmceous tint, with a rufescent streak at the knee, the tibiae commonly 

 fawn-grey, and the tarsi dusky with black joinings. Wings vitreous, tinted slightly with 

 extremely light brown-ochreous ; neuration olive-black ; pterostigmatic region of the 

 fore wing somewhat obscured. 



2 . Wings clear, with sfreenish errev neuration. Femora ijreenish srev or olivaceous; 

 tibiap, tarsi, and caudal setae dusky. Length of body 7-10, wing 8-10 ; setae, im. d 16, 

 2 13 mm. 



Sab. Common bv mountain-torrents in Switzerland and Savov : in the neiErhbourhood 

 of Mt. Blanc at Barberine, Xant Bourant (4500 ft.), and Mottet in July ; also at a stream 

 fi'om Mt. Brevent (Pict.) in August ; also near the Chalets de Pitty, Samoens (4700- 

 5100 ft.) 8 A.M. 29 August, water 51' F., and near Les Clous, Champery (4000 ft.). Also 

 at La Kosa in the Bernina Pass (6000 ft.) 630 a.m. 25 August, water 5r F. K<?adily 

 distinguished by the tint of the d wings from B. melanonyx. 



BAEns BrcERAirs, Etn. Plate LXIY. 19 (forceps). 



Baitls buceratus, ! Etn., Trans. Ent. Soc. London (1870) o; ! id., op. cit. (1871) 116, pi. v. 23, 23a 



[detail] . 



Subimago d- Imago {living). — ^^'ery similar to £. vermis and B. tenax; chiefly distin- 

 guishable from them by the 3 forceps. The forceps-limbs in B. biiceratus, divergent from 

 one another in the fii-st and second joints, again converge, and are also strongly arcuate 

 beneath ; the second joint of each limb is more domed than in those other species, and 

 the terminal joint more nearly oval. Length of body, 6 im. 8-9, wing 8-9, setae 

 10-16 mm. 



Sab. England. The Eennet and Holy brook near Reading, Berkshire, in April and May. 



Baetis primrs, Burmeister. Plates XYI. 29 e (hind-wing ) & LXIY. 20 (forceps). 

 ? Ephemera mufica or \Ephemera], Linn., [En. Suec. ed. i. no. 752 (1746)] ; id., Srst. Xat. ed. x. 



