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



and need not be detailed. Length of body, d $ 5'5-8 ; wing 6-8-5 ; setse, d im. 11-16, 

 2 im. 11 mm. 



Hab. France ; in a tributary of the Loire, near Brive (Hante Loire), 24th Sept. ; the 

 Garonne by the Pont d'Empalot, Toulouse, 21st Aug. The hind wing and 6 genitalia 

 resemble those of C. 2}enmilatum ; but the terminal joints of the forceps-limbs are rather 

 stouter and shorter than those of that species, and are more like the terminal joints of 

 the forceps of Cloeou simile. 



Centroptiltjm lituratum. 



Ephemera % culiciformis, Scop., Eut. Carniol. 264 (1763). 

 Cloe liturn, Yict., Hist. Nat. Nevropt. ii. Ephem. 260, pi. xli. 1-3 (1843-5). 

 Cloeon lifura, Walk., List of Neuropt. in Brit. Mus. part iii. 574 (1853). 

 Centroptilum lituratum, Etn., Traus. Ent. Soc. London (1871) 109. 



Suhwiago. — Wings dull yellowish grey. Setae fuscous (brun). 



Imago. — d . Turbinate eyes light cadmium or sulphur-yellow. Metathorax traversed 

 lengthwise by a black streak, which does not quite reach the hind border ; the meso- 

 thorax [? metathorax] has two dots of the same colour. Abdomen light rufo-fuscous, 

 rather darker towards the tip, and with a row of spots on each side. Setse lutescent, 

 annulated with black. Eore and hinder legs uniformly lutescent. Wings vitreous with 

 pale neuration. 



? . Eyes black. Body yellow-ochreous, with two little reddish lines on the meso- 

 thorax, and some spots on the sides of the abdomen. Length of body 8 ; setoe, <s im. 

 12 mm. 



Sab. At the base of Mt. Saleve, in autumn. [After Pictet.] The streak on the 

 mesothorax distinguishes the d of this species from C . pulchrum. 



Centroptiltjm stenoptebtx, Etn. 



? Ephemera alhipes &^- parvula, Sco^., Eut. Carniol. 264 (1763); Vill., C. Lin. Ent. iii. 22 (1789); 

 01., Eucycl. Meth. vi. 421 (1791). 



Cent7'optilum stenopteryx,\ Etn., Trans. Ent. Soc. London (1871) 110, pi. v. 15, 15a [details]. 



Subimago {dried). — Wings and setae light sepia-grey. 



Imago {dried). — Notum light brownish ochre, browner in the 6 . Body very much 

 discoloured through age. Setae white. Wings vitreous ; the stronger nervures slightly 

 tinted with dull yellowish amber near the roots ; in the pterostigmatic portion of the 

 marginal area of the fore wing are 6 or 7 cross veiulets, which are nearly always simple 

 and straight, besides occasionally one or two rudiments at the costa ; but one of the S 

 examples has most of them forked and anastomosing with each other. Length of body, 

 d 4, 2 4'5 ; wing 4-5-5 ; setae, 6 im. 9, ? im. 5 mm. 



Sab. Carinthia (Zeller MS. in M^Lach. Mus.). 



Centroptiltjm tenellum, Alb. Plate XVII. 30 c (forceps). 

 Centroptilum, tenellum, ! Albarda, Ent. Mo. Mag. xv. 128 (1878). 

 Imago {dried), (^ . — [Turbinate eyes during life, E,oman sepia or clove-brown ; lower eyes 



