96 EBV. A. E. EATON ON EECENT EPHEMEEID^ OR MAYFLIES. 



Potamanthus cinctus, Brauer, Neuropt. Austr. 27 (1857) ; Hag., Ent. Ann. (1863), 20; Ausser., Ann. 

 d. Soc. Natur. Modena, Ann. iv. 137 (1869).— P. inanis, Pict., Hist. Nat. Nevropt. ii. Ephem. 235 

 (1843-5); Walk., List of Neuropt. Ins. in Brit. Mas. part iii. 544 (1853).— P. Xhalteratus, Pict., Hist. 

 &c. 236 (1843-5) ; Walk., List &c. iii. 546 (1853).— P. hyalinus, Pict, Hist. &c. 237 (1843-5). 



Cloefuscata, Pict, op. cit. 251, pi. xl. i. (1843-5) ; Oulianine, Neuropt. & Orthopt. of the Prov. of 

 Moscow, p. 28 (1867). 



Cloeon fuscata, Walk., List of Neuropt. in Brit. Mus. part iii. 573 (1853). 



Leptophlebia cincta, ! Etn., Trans. Ent. Soc. London (1871), 87, pi. iv. 27 [detail] ; Hag. & Etn., op. 

 cit. (1873), 396 ; Meyer-Diir, Bull. Soc. Ent. Suisse, iv. 318 (1874) ; Rostock, Jahresb. d. Ver. f. Naturk. 

 Zwickau, 1877, p. 84 (1878). 



Subhnago {living). — Wings black-grey [browner when dry], with the longitudinal 

 nervures indistinctly yellowish. Thorax pitch-brown or pitch-black. Abdomen in 

 segments 2-7 cinereous, the posterior segments fuscous, the joinings narrowly greyish- 

 white. 



Imago {living), 6 . — Upper eyes warm sepia-brown ; lov/er eyes black. Thorax jet- 

 black above. Abdomen seldom, or in large examples, uniformly raw umber- or pitch- 

 brown above, usually so in segments 8-10 only, and in segments 2-7 vitreous ; these are 

 often faintly lutesccnt towards their hinder borders, their tracheae are partly black near 

 the spiracles, and the ventral nervous ganglia somewhat rusty ; joinings of the opaque 

 segments either light yellowish or reddish. Setaj and forceps whitish, the latter blackish 

 grey towards the base, and sometimes 4-jointed instead of 3-jointed. Penis-lobes slightly 

 divergent distally, each with a short acute projection on the outer side near the tip, and 

 a long slender acuminate reclinate spur beneath (figured by me in 1871). Legs white 

 or cretaceous, the fore femora darker than the hinder, the tibia? and tarsi in some lights 

 slightly tinged with testaceous. Wings vitreous ; the stronger longitudinal nervures in 

 opaque view faintly amber-colour (becoming pitch-brown in the dried insect) ; the 

 marginal area of the fore wing in specimens of average or large size contains 10-14 very 

 faint cross veinlets before the bulla, and beyond it 18-26, mostly stronger than the others, 

 sliffhtly sinuous, and in the pterostigmatic region commonly branched irregularly and 

 anastomosing near the costa ; in small examples there are about 8 before and 16 beyond 

 the bulla, and the latter are sinuous, but less irregular than those of large specimens. 



2 {living). — Subsimilar to the d , with the stronger nervures of the wings piceous ; 

 the marginal area of the fore wing contains in large examples about 16 cross veinlets 

 before, and 25-27 beyond the bulla ; in small specimens, about 9 cross veinlets before, 

 and 18-20 beyond the bulla ; these in the pterostigmatic region are chiefly sinuous and 

 generally simple. Abdomen fusco-piceous, with yellowish joinings ; the setse and legs 

 testaceous, the hinder tarsi whitish. Length of body 7-8 ; wing 8-9 ; setae, d im. 8 & 9- 

 8 & 11, subim. 9 & 7 ; 2 im. 7 & 10-8 & 11 mm. 



Hab. Northern and temperate Europe ; in streams and rivers during the summer and 

 autumn. Pictet probably confused this species with Habrophlebia lauta (to which his 

 description of Potamanthus % cinctus applies) because it was mingled with a Hahro- 

 phlebia in his collection, and is found in the neighbourhood of Geneva. In September 

 1879 I found both of these species beside a stream at Troinex, near Mt. Sal^ve. 



