EEV. A. E. EATON ON EECENT EPHEMEEID.E OR MAYFLIES. 291 



femur. Hinder legs sometimes of a somewhat browner yellow amber-colour than in the 

 other sex ; the femora rather dark towards the tip ; tarsi in small specimens pale, with dark 

 joinings, but in large specimens usually intense sepia-brown or black ; basis of subcosta 

 and radius, and great cross vein of hind wing dark ; but the nervuros themselves light 

 yellowish ; ungues black. Setoe during life smoke-grey with rufescent joinings ; token 

 dried their prevailing colour is sometimes warm sepia-brown. The proportions of the 

 tarsal joints, the less obtuse apex of the ventral lobe of the 9th abdominal segment, and 

 the branched and anastomosing pterostigmatic cross-veinlets of the fore wing, serve to 

 distinguish tlie ? of H. angtistipenuis from Epeorus torrentium. Length of body, s 8-11, 

 S 9-12; wing, d 9-12, ? 9-11; sette, d im. 19-23, subim. 13, $ im. 15-22, subim. 

 11-13 mm. 



Kab. Continental Europe from Norway (Wallengren) to Spain (Ramb.). Common 

 generally at rivers and lakes, from at least July to September, and doubtless earlier. 

 Amongst other localities it occurs in Holland at Arnheim ; in Switzerland in the 

 environs of Geneva and Lac Leman at Genthod, as well as at Basle and Berne ; in Savoy 

 at Annecy, Chambery, Aix-les-Bains, and Evian (M^Lach.) ; in Northern France at 

 Fontainebleau (zVZ.) ; in Southern France at Toulouse and Tarascon [Ariege] ; and at 

 Madrid (E,amb.). At the Berne Museum in 1879 Albert MiiUer showed me the original 

 drawings for Imhcff's plate (1845). The d oculi are rightly represented in the artist's 

 original drawing as warm sepia-brown, intersected horizontally l)y a ' gramineous ' line. 

 In the revised copy adopted as the original of the published figure the eyes were 

 coloured ' gramineous ' entirely. Pictet made them ' cyaneous ' — a very light shade of 

 ultramarine, or an intense ultra ash-blue. His specimens may have been moribund or 

 flaccid with age, or he may have coloured them after the eyes of a subimago. 



ECDYUKUS VOLITANS, Etu. 



Heptagema i-olHans, ! Etu., Trans. Eut. Soc. London (1870) 7; ! id., op. at. (1871) 147, jil. vi. 20 

 (genitalia) ; Rostock, Jaliresb. d. Ver. f. Naturk. Zwickau, 1877, p. 89 (1878) ; Parfitt, Rep. & Trans. 

 Devon. Association, xi. 398 (1879) ; Palmeu, Paar. Ausf.-Gauge d. Geschl.-Org. b. Insect. S. 52 

 [anatom.] (1884). — % H. flavipennis, var. ?, Etn., supra at pp. 273 & 274 (1885). 



Imago {dried). — Notum of d pitch-brown ; that of 2 light yellowish brown ap- 

 proaching brown-ochre, varied on the metanotum with pitch-brown. Fore leg of d 

 somewhat rufo-piceous in opaque view, with an indistinct darker median band on the 

 femur followed at a short interval by almost imperceptible traces of a preapical band ; 

 the extreme tips of the femur and tibia, and the tarsal joinings, piceous or blackish ; 1st 

 tarsal joint of normal length. Fore leg of 2 raw umber-brown, with the median and 

 preapical dark bands well defined ; tibia lighter than the femur ; tarsus partially or 

 wholly concolorous with the femur. Hinder legs light yellowish brown, with browner 

 femoral bands ; both bands are well defined in ? , but the proximal band is obsolete in 

 d ; tarsi more or less sepia- or w^arm sepia-brown, with dark incisures. Setae greyish 

 white, with piceous joinings ; in ? some of the alternate joinings near the base of the 

 setge are narrower than the others. Wings vitreous : neuration in d piceous. varying 

 with change of posture from pitch-black to pitch-brown, the cross-veinlets in some lights 



39* 



