160 HEV. A. E. EATON ON RECENT EPHEMEEID^ OE MAYFLIES. 



of the Pyrenees and Alps. Amongst localities in Trance where it has been captured may 

 be mentioned Orthez, Blois, and the Vosges. 



Baetis venustulus, sp. nov. Plate LXIV. 10 (forceps). 



Imago {living). — d . Turbinate ej^es citron-yellow ; lower eyes olivaceous. Notum 

 greenish bistre-brown (virescenti-fuscum) varied posteriorly with bistre-brown ; the parts 

 adjoining the meso- and meta-sterna are of the former colour, or olivaceo-fuscous. 

 Segments 2-6 of the abdomen translucid white, with a cretaceous tint on the dorsum, and 

 black spiracles ; segments 7-9 above fusco-olivaceous with ochreous joinings and dark 

 stigmata, beneath more or less ochraceous ; segment 10 somewhat of a purplish tint 

 above. Porceps and setce smoky white. Pemora translucid white, tinted very faintly at 

 the tips with cretaceous ; tibiae and tarsi smoky white, with the ungues and in the 

 hinder tarsi the terminal joints darker. Wings and neuration colourless ; pterostigmatic 

 cross veinlets variable. 



5 . Very like B. bmoculatiis $ . Oculi and orbits of ocelli olive-green ; a rufescent 

 spot on each side between the base of the antenna and the oculi. Hinder femora 

 spotless ; tibiaj and tarsi all dark smoky grey, with the tarsal joinings and the tips of the 

 terminal joints darker. Neuration of wings pitch-black. Abdominal spiracles (not the 

 tracheae) black. Length of body 4-4-5 ; wing d 4-5, S 5 ; setaj 6 im. about 9, ? im. 

 6'5 mm. 



Hub. Switzerland ; the Rhone, in the vicinage of Geneva, above the confluence with the 

 Arve ; 25 August, 1879, on wing in the evening before dark. 



Baetis scambus, Etn. Plate LXIV. 9 (forceps). 



Baetis scambus, ! Etn., Traus. Ent. Soc. London (1870) 3; \id., op. cit. (1871) 112, pi. v. 17, 17 a 

 [details] . 



Subimago {living). — Wings, setae, tibiae, and tarsi cinereous ; forceps-limbs and femora 

 cretaceous, or sometimes the latter are greenish white and are marked in the $ almost 

 imperceptibly with a cinereous spot before the knee. 



Imago {living). — d . Turbinate eyes clove- or warm sepia-brown ; lower eyes black. 

 Notum jet- or pitch-black. Abdominal segments 2-6 translucent white or greenish 

 white, faintly suffused with light bistre-brown ; the others bistre-brown. Setae white, 

 with a few of the basal joinings darker. Wings vitreous. Pemora either cretaceous or 

 olive-grey ; fore tarsus smoky grey ; hinder tibiae and tarsi greenish white, with ungues 

 and the tarsal joinings slightly darkened. 



$ . Body olivaceous-brown. Eyes intense olivaceous. Pemora olivaceous ; tibiae and 

 tarsi dark smoky grey. Wings vitreous, with pitch-black neuration. Setae smoky grey, 

 with subopaque joinings. Length of body 6-6-5; wing 6-7 ; setae, <3 im. 12, subim. 7, 

 ? im. 9-10, subim. B mm. 



Sab. England ; Ashbourne and Norbury, Derbyshire, in the Dove and in the Henmoor 

 Brook ; June and September. Porceps rather similar to those of B. binociilatns ; but the 

 limbs are more slender, and are closer together at the base. Hind wings binei'ved. 



