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



black-grey. Meso- and mefcanotum light umber-hrown, with black sutures. Abdomen 

 white, segments 1-3 partly shaded above very slightly with greyish. Legs white ; the 

 fore coxa, femur, and base of the fore tibia dark grey ; hinder femora white. 



d {living). — Similar; meso- and metanotura lighter than in the $ , and with sutures 

 less distinctly black. Costa, subcosta, radius, sector, and cubitus blackish grey to rather 

 beyond the middle. Length of wing 3, setse about 12 millim. 



Hub. Dorsetshire, in the Syndeford brook, near Shedrick, in the parish of Thorncombe, 

 Cliard; also the Dove, near Mayfield, Ashburne, Derbyshire (June). I suspect this is 

 the insect quoted as. English by Pictet under C. % lactea in 1843-5. 



C^Nis LACTELLA (renamed). 



Canis if lactea, Pict., Hist. Nat. Nevi-opt. ii. Epliem. 27G, pi. xliii. 1-4 & xliv. (1843-5) ; Hag., Trans. 

 Eut. Soc. London (1873), 397. 



Imar/o (after Pict.). — Head grey, with the vertex a little lighter. Thorax light ochreous, 

 with the sides of the prothorax and the mesonotum fuscescent ; the latter marked with 

 a cruciform spot of the ground-colour. Abdomen white, with very slightly defined spots 

 on the sides of the segments. Sette whitish. Legs tinged very faintly with lutesceut. 

 Wings vitreous, colourless ; subcosta and radius black ; the other nervures lutesceut, 

 colourless in the d . 



(S {dried). — Vertex of head pitch-brown. Thorax translucent ; the pronotum rather 

 greyer than the remainder in some lights ; meso- and metanotum pervaded with a light 

 brownish amber-colour, the metathorax viewed sideways rather yellower amber. Ter- 

 minal segments of the abdomen very light yellowish am])er or light brown ochreous ; the 

 remainder whitish amber, with traces of the same yellowish colour at the sides of the 

 back; legs and setae uniformly whitish, or whitish amber with a faint yellowish tint. 

 Length of body, $ 4, d (dried) 3 ; wing, ? 4, d 3"5 ; setaj d 11 millim. 



Kal). Lakes of Geneva and Zurich, in the middle of summer. I obtained it at Geneva 

 (1230 ft. alt.) on the 10th August, in profusion at gas lamps. Pictet's fig. 1 is a very 

 good likeness of the living 6 im. 



Cjcnis halterata, Pab. PI. XV. 2G. 



Ephemera halterata, Fab., Gen. Ins. 24,4 (1777) ; id., Sp. Ins. i. 384 (1782) ; id., Mant. Ins. i. 243 

 (1787) ; Vill., C. Linn. Ent. iii. 18 (1789) ; Gmel., Linn. Syst. Nat. ed. xiii. i. 2G29 (1790) ; 01., Encyc. 

 Metb. vi. 418 (1791) ; Fab., Ent. Syst. emend, iii. pars i. 69 (1793) ; Schr., Fn. Boica, ii. pars ii. 198 

 (1798) ; Lat., Hist. Nat. Crust. & Ins. xiii. 95 (1805) ; Zet., Ins. Lap. 1045 (1840) ; Hag., Trans. Ent. 

 Soc. London (1873), 396. — E. brevicauda. Fab., Ent. Syst. emend, iii. pars i. 69 (1793) ; Walck., Fn. 

 Paris, ii. 9 (1802) ; Lat., Hist. Nat. Crust. & Ins. xiii. 96 (1805) ; Zet., Ins. Lap. 1045 (1840). 



Brachijcercus chironomiformis, Curt., Lond. & Edinb. Pbil. Mag. ser. 3 (1834), 122. 



Cmiis chironomiformis, Steph., 111. Brit. Ent. vi. 62 (1835); ! Etn., Trans. Ent. Soc. (1871), 94.— 

 C. macrura, ! Stepb., 111. Brit. Eut. vi. 60, pi. xxix. 1 (1835) ; Walk., List of Neuropt. in Brit. Mus. 

 583 (1853); Hag., Ent. Ann. (1863), 10; ! Etn., Trans. Ent. Soc. London (1868), 279-82 [nympb] ; 

 \id., op. cit. (1871), 93, pi. v. 4 [details]; Hag., op. cit. (1873), 397; Meyer-Diir, Bidl. Soc. Ent. 

 Suisse, iv. 308 (1874) ; Rostock, Jabresb. d. Ver. f. Naturk. Zwickau, 1877, 80 (1878). — C. interrupta, 

 Stepb., 111. Brit. Ent. vi. 62 (1835) ; Pict., Hist. Nat. Nevropt. ii. Epbem. 287 (1843-5) ; Walk., List 



