80 EEV. A. E. EATON ON RECENT EPHEMEEID^K OR MATELTES. 



the hinder portion of the segment in segments 1-7 is a piceous dot on each side: the 

 penultimate ventral segment more or less hrown-ochreous. Setae chieily brownish 

 yellow-ochreous, becoming whitish distally ; their joinings and a tinge at their roots 

 reddish or piceous. 



Immjo [living). — Eyes of 6 glaucous or olive-brown above. jBody marked in a 

 manner similar to that of the subimago. Eorceps stramineous, their joinings narrowly 

 testaceous. Coxa, trochanter, and base of the femur of the fore leg straw-yellow, the rest 

 of the femur brownish yellow-ochreous ; tibia rufo-piceous at the knee, then testaceous, 

 but at the extremity, including the pedicel of the tarsus, piceous ; tarsus fumatose with 

 piceous joinings and subrubiginose ungues. Hinder legs straw-yellow, their tarsi 

 testaceous, with the joinings and ungues subrubiginose. Setae suhlutosceut with piceous 

 or black joinings. Wings flavescent, with fuscescent cross veinlets ; these, in the ptero- 

 stigmatic space of the fore wing, are numerous, sinuous, and anastomose with one 

 another. 



2 brighter than the S , but otherwise very similar ; the fore legs more nearly of the 

 same colours as the hinder pairs, with their tarsal joinings dark fuscous. Length of body, 

 d 10-13, 2 9-13 ; wing, c? 12-13, 2 15 ; setge, d im. 18 & 15-19 & IG, subim. 13; 2 im. 

 12 mm. 



Sab. England, at Weyhridgc, Surrey {MfLacli.) ; first recorded by Curtis without 

 locality. Erance, near Paris {Oeoffroy) ; common near Brive (Haute Loire) at 2000 ft. ; 

 in the defile of Pierre-Lis, near Quillan (Aude) at 1100 ft.; Toulouse, at 426 ft. altitude. 

 Switzerland, at Zurich [M'Lach.). Germany {Sulz.), Heidelberg [Pict.) ; Courland 

 [Brauer), July and August. My captvires at Brive and Quillan were made by beating 

 alder trees near swift parts of the rivers in the daytime ; hut those at Toulouse were 

 effected after nightfall at gas lamps in the vicinage of Pont St. Michel. The scarcity of 

 this species in collections is probably due more to its time of flight than to its actual 

 rarity. The nymph harbours under stones in gently flowing water at the borders of 

 rapids. 



POTAMANTHUS EeRRERI. Pict. 



Potamanthus Ferreri, Pict., Hist. Nat. Nevropt. ii. Ephem. 203. pi. xxv. 1 (1843-5) ; Walk., List of 

 Neuropt. Ins. in Brit. Mus. part iii. 539 (1853) ; Etn., Trans. Ent. Soc. London (1871), 77. 



Imago {dried), <s . — According toM. Pictet this species differs from P. hiteus in having 

 uniformly pale yellow setae, colourless wings with very light yellow longitudinal nervui*es 

 and translucent cross veinlets, and a strongly defined brown spot on the hinder part of 

 the mesonotum, where P. hiteus is often bright yellow. When he describes the dorsal 

 stripe as composed of a series of trianglar spots, one in every segment but the last, there 

 is reason for suspecting that these triangles are truncated anteriorly. Length of body 13, 

 exp. of wings 30, setae 18 mm. 



Rub. Captured near Turin by le Chanoine Eerrero. The unique specimen formerly in 

 the Geneva Museum, was not there in 1867. 



