EEV. A. E. EATON ON EECENT EPHEMEEID.E OE MAYFLIES. 95 



Length of body 9-11 ; wiug 10-13 ; setae, d iru. 12 & 13-14 & 16, subim. 7 ; $ im. 9- 

 13, subim. 9 & 10-10 & 12 mm. 



JIab. Great Britain ; tlie Vosges (M''Lach.) ; Germany and Switzerland ; in streams, 

 lakes, and rivers. May to August. This species is easily distinguished from L. margi- 

 nata by the form of the penis. Each of the lobes is widely dilated at its extremity ; in 

 dorsal view tlie dilated part is seen to be prolonged laterally into a short deflexed lanceo- 

 late projection ; beneath the inner extremity of the lobe is a long slender subulate 

 reclinate spur-like appendage. 



Leptophlebia castanea, Pict. 



Potamanthus castaneus, Pict., Hist. Nat. Nevropt. ii. Ephem. 215, pi. xxvi. 4, 5 (1843-5) ; Walk., 

 List of Neuropt. Jus. in Brit. Mus. part iii. 542 (1853). 



Leptophlebia castanea, Etu., Trans. Ent. Soc. London (18ri), 86; Meyer-DUr, Bull. Soc. Ent. Suisse 

 iv. 310 (1874). 



This species is distinguishable from L. submarginata by its smaller size, its thorax 

 being no darker than the abdomen (which is of a uniform chestnut-brown), traversed in 

 the mesonotum by a fine longitudinal light-coloured line. Legs and setae unicolorous 

 light brown. Wing-nervures whitisJi. Eyes of 6 brick-red above. Length of body, S , 

 and setai 8 ; exj^anse of wings 17 mm. 



Sab. At a swift stream at the extremity of Lake Leman, near the marals deVilleneuoe, 

 at the beginning of July. (After Pictet.) In 1879 I saw a 6 subimago, seemingly of 

 this species, in the Museum at Lyons. 



Leptophlebia Meyeki, sp. nov, PL XL 17 d (penis). 



Imago {dried), 6 . — Thorax polished, deep black above. Abdomen piceous, with 

 segments 3-6 or -7 translucent greenish-grey or brown. Wings vitreous ; fore wing with 

 the base and extremity of the costa, the subcosta and radius throughout, tinged with 

 piceous or amber-brown ; pterostigmatic space colourless, its veiulets somewhat crowded 

 and curved, many of them also branched, with their branchlets anastomosing towards 

 the costa. Legs dark piceous, the fore tarsus and the hinder tibiie and tarsi blackish 

 grey or fumatose, the last with the tips of the joints very narrowly darker. Ventral 

 ganglia rufescent ; forceps whitish ; setaj fumatose or white, with rufescent jomings. 

 Length of body 6-9 ; wing 7-10 mm. 



Sab. Captured by Herr Meyer-Diir at Zurich and the Melch Alp, in July.— Easily 

 recognized by the uncinate penis-lobes. 



Leptophlebia cixcta, Retz. PL XXXIL (nymph). 



[Ephemera] or E. cincta [De G., Mem. pour serv. a Thist. d. Ins. ii. pars ii. 650, pi. xvii. 17-18 

 (1771)] ; Retz, C. De G. Gen. & Sp. Ins. 57 (1783).— £. J nigra, Fourcroy, Ent. Par. ii. 352 (1785).— 

 E. inanis, or lEphemera'] , [Zsch., Mus. Lcsk. i. 50, no. 15 (1789)] ; Gm^l., Linn. Syst. Nat. ed. xiii. 

 i. pars V. 2629 (1790) ; OL, Encycl. Meth. vi. 421 (1791).— £. ll albipennis, Eab., Ent. Syst. emend, iii. 

 pars i. 70 (1793).— £. % halterata, Shaw, Gen. Zool. vi. part ii. pi. Ixxxi. (1806).— -E. hijaliaata, Zet., 



Ins. Lap. col. 1044 (1840). 



13* 



