EEV. A. E. EATON ON EECENT EPHEMEEID^ OR MAYFLIES. 159 



Pict., Hist. Nat.Nevropt. ii. Ephem. 193(1843-5) ; Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 

 561 (1853). — B. autumnaUs, Curt., Lond. & Edinb. Pliil. Mag. ser. 3 (1834) p. 121 ; Steph., 111. Brit. 

 Ent. vi. 67 (1835). — B.fuscata, Stepli., op. cit. vi. G6 (1835). 



Brachyphlebia biocidata, ! Westw., Introd. to Mod. Classif. of Ins. ii. 25 & Addend, to Gen. Syuops. 

 158(1840). 



Cloe hioculata, Pict., Hist. Nat. Nevropt. ii. Epliem. 244, jsls. xx.\iv.-xxsv. (1843-5) ; Hag., Smithson. 

 Miscell. Coll. (1861) Synop. Neuropt. N. Am. 52 [exel. example in Brit. Mus.] ; id., Stet. Ent. Zeit. xxvi. 

 229 (1865); Oulianine, Neuropt. & Orthopt. of the Prov. of ISIoscow, p. 28 (1867). — C. autumnalis, 

 Pict., Hist. Nat. Nevropt. ii. Ephem. 270 (1843-5).— C. Xpunula, Oulianine, Neuropt. & OrtLopt. of the 

 Prov. of Moscow, p. 28 (1867). 



Cloeon hioculata, Walk., List of Neuropt. Ins. in Brit. iMus. 572, exempl. 1 a-f [excl. g.] (1853).— 

 C. autumnaUs, Walk., op. cit. 578 (1853).— C. Xpumilum, ! Hag., Ent. Ann.(1863) 33'; ! Etu., Ann. & 

 Mag. of Nat. Hist. (3) xviii. 147 (1866). 



Snb/maffo {living). — Wings pale grey or smoke-grey ; the hind Avings sometimes 

 paler or whitish ochraceous. Femoi'a greenish grey or very pale greenish yellow or 

 greenish white, with pale grey tibiae and black tarsi, the green tint more pronounced in 

 the female sometimes, and then her fore femora are pale olive-green with a dark spot 

 before their distal extremities, while her hinder tibiaj acquire a greenish yellow tint. 

 Setae pale grey. 



Imago {living). — d . Turbinate eyes lemon- or bright yellow; lower eyes yellowish 

 green, black-green, or piceous. 



<S var, 1. Thorax burnt sienna, or fuscous, or pitch-black above. Abdomen in 

 segments 2-6 or 7 ti-anslucent white, with a more or less slight pale yellow tint, and 

 with the spiracles ancf sometimes the tracheal trunks rubiginose or black ; the remaining 

 segments above either burnt sienna, or fuscous, or fusco-olivaceous, edged distally with 

 bright yellow ; the last segment sometimes lighter above than the others, and beneath 

 either ochraceous or olivaceous. Seta; and forceps white. Femora yellowish white, the 

 rest of the fore legs white or greyish white ; the rest of the hinder legs white. Wings 

 vitreous, with whitish neuratiou, but with the base of the subcosta and radius sometimes 

 fuscous. 



c? and ? va7\ 2. Body either light bistre-brown or greenish bistre-broAvn or olivaceous 

 above, with the extreme tips of tlie abdominal segments either narrowly darker or bright 

 yellow, and the subcutaneous trachese black or intense sepia-brown ; venter olivaceous, 

 marked Avith two dark dots near the base of every segment. Setna either greenish Avhite 

 or else white or greyish, and tinged at the bases with greyish or dusky. Eyes of ? 

 either olivaceous, piceous, or black. Legs in some lights olivaceous ; in others the fore 

 femur becomes fusco-olivaceous, with the knee pale, and tlie tibia and tarsus either 

 uniformly warm sepia-brown, or the tibia brownish black and the tarsus charcoal-black ; 

 hinder femora and tibine much paler than the anterior, and marked before the knee Avith 

 a curved greyish spot ; hinder tarsi grey. Length of body 4-8 ; Aving 6-8 ; setae 6 im. 

 12-14, subim. 7-10, ? im. 10-12, subim. 8-10 mm. 



Hab. Europe, from Portugal, near Cintra (380 ft., 27 April, 1880), eastwards to Southern 

 Persia and Armenia (Hagen Mus.), northwards to Moscoav and ScaudinaA-ia. North 

 America, in Hudson's Bay I'er. (Dale Mus.). The species is common in rivers northwards 



