EEV. A. E. EATON ON EECENT EPHEMERID.^ OR MAYFLIES. 161 



Baetis vebnus, Curtis. Plate XVI. 29 d (forceps). 



?Ephemt7-a t bioculafa, Fourcroy, But. Paris, ii. 353 (1785).— ? jB. testacea [Zsch., Mus. Lesk. i. 50, 

 no. 17 (1789)]; Gm(51., Linn. Syst. Nat. eel. xiii. i. pars v. 2G30 (17'J0); 01., Encyc. Meth. vi. 422 

 (1791).— 1£. dubia, ! Steph., 111. Brit. Ent. vi. 59 (18.35). 



Baetis vermis, Curt., Lond. & Ediub. Phil. Mag. ser. 3 (1831) 121 ; ! Stepli., 111. Brit. Ent. vi. 66 

 [B. venui'] (1835).— 5. J culiciformis, ! Steph., op. cit. vi. G6 (1835).— B. phceopa, ! idem, inter synon, 

 (1835).— 5. X striata, lid., op. cit. vi. 65 (1835).— B. phceops, ! Etn., Trans. Ent. Soc. London (1870) 4; 

 lid., op. cit. (1871) 115, pi. v. 21, 21 a [details]; Meyer-Diir, Bull. Soe. Ent. Suisse, iv. 310 (1874). 



Cloeverna, Pict., Hist. Nat. Nevropt. ii. Ephein. 270 (1843-5). 



Clo'eon verna, Walk., List of Neuropt. Ins. in Brit. Mus. part iii. 578 (1853). 



Siibimago {lichig). — Wings smoky or mousey grey ; setae and forceps smoky. Femora 

 either testaceous grey, light greenish grey, or even greenish white, each with an ill-defined 

 dark v-shaped mark before the extremity ; tibiae smoky, the anterior black at the tip ; 

 fore tarsus black ; hinder tarsi cinereous, with black joinings. 



Imago (living) . — d . Turl)iuate eyes burnt-umber ; lower eyes brown-black. Notum 

 at first bistre-brown, changing with maturity to pitch- and jet-black. Dorsum of 

 abdomen variously coloured ; either bistre-brown or darker, with the extreme edges of the 

 joinings greyish white ; or in segments 2-7 bistre- or greenish grey and translucent, and 

 in segments 8-10 bistre-brown with dark tracheae ; venter cinereous. Setse white or 

 smoky-grey. Forceps-limbs greyish white, or more of a greyish tint towards the base, 

 vrith the last two joints white. Wings vitreous, with suflPuscous longitudinal neuratiou. 

 Fore femur subolivaceous, with a dark rounded spot before the tip ; the tibia whitish 

 grey, the tarsus dark grey : hinder femora either greenish grey, or cretaceous with a light 

 greenish tint; tibiae whitish; tarsi whitish or greyish white, with the joinings and the 

 uncinate claw scarcely darker. 



S . Very similar. Eyes sepia-black or black. Notum at first pitch-brown, becoming 

 pitch-black or black. Femora olivaceous ; tibiae greyish- or greenish- white ; tarsi char- 

 coal-black with black joinings, the fore tarsus darker. Setae white, tinged with brown- 

 black basewards. Length of body 5'5-8 ; wing, d 5-7, ? 7-9; setos, rf im. 12-16, 

 subim. 5, ? im. 10-12, subim. 7 mm. 



Sab. Great Britain ; Finmark, Hammerfest and Alten. It frequents English streams 

 and rivulets in May, June, September, and October. The adult d may be recognized by 

 the forceps-limbs having each a caUus at the interior extremity of the basal joint, no 

 very marked deuticulation at the inner base of the second joint, and an ovate-oblong 

 terminal joint. 



Baetis bhodani, Pictet. Plates XVI. 29 c (hind-wing, d head), and LXIV. 12 

 (forceps). 



Cloe rhodani, ! Pict., Hist. Nat. Nevropt. ii. Ephdm. 248, pis. xsxvi.-xxxix. (1843-5) ; Brauer, Neuropt. 

 Austr. 26 (1857) ; ! Hag., Ann. Soc. Ent. Fr. (4) iv. 39 (1864) ; Meyer-Dur, Mitth. Schw. Eut. Ges. i. 

 221 (1864) ; ?Oulianine, Neuropt. & Orthopt. of the Prov. of Moscow, p. 28 (1867) ; Ausscr., Ann. d. 

 Soc. Natm-. Modena, Ann. iv. 136 (1869) ; Joly, Rev. d. Sc. Nat. Montpellier, v. 310, pi. vii. 17-18 

 (1876) [details] .—C. maderensis, I Hag., Ent. Mo. Mag. ii. 25 (1865). 



SECOND SERIES. — ZOOLOGY, VOL. III. 22 



