188 EEV. A. E. EATON ON EECENT EPHEMERID.E OR MAYFLIES. 



66° F.). Distinguishable from C. simile by the colour of the legs and the bright colour 

 of the 6 oculi ; and from C. rnfuhtm by having the d forceps-limbs close together at 

 their insertion, by the greater irregularity of the pterostigmatic cross veinlets &c. In 

 the absence of the subimago, and without direct comparison of dried examples with 

 Rambur's type, it is impossible to pronounce an opinion as to the likelihood or otherwise 

 of this species being identical with the following. 



Cloeon subinfuscatum, Rambur. 



Cloe subinfuscata, ! Ramb., Hist. Nat. d. Ins. Nevropt. 298 (1842). 



Cloeonl halterata, var., Walk., List of Neiu-opt. lus. in Brit. Mus. part iii. 577 (1853). — C. subinfus- 

 catum, !Etn., Trans. Ent. Soc. London (1871) 104. 



Subimago [dried). — ? . Wings tinted with dark ivory-black-grey, with luteous longi- 

 tudinal nervures ; the pterostigmatic portion of the marginal area contains about 12 

 sparingly forked cross veinlets; there are none before the bulla. Thorax lutescent; 

 legs rather light brown-ochre. The joinings of the setae dark. Length of body, ? 9 ; 

 wing 11 mm. 



Sab. Provence {Ramb.). 



Cloeon rtjfulum, Miiller. Plates XVII. 81 c (forceps), XLVII. no. 1 (nymph and 

 details). 



Ephemera rufula, MiilL, Zool. Dan. Prodi-. 143 (1776). — E. % culiciformis and J striata, Blanch., Hist. 

 Nat. des Ins. iii. 55 (1840). — E. J bioculata, Blanch., Metamorph. &c. des Ins. p. 127, fig. [misdrawn] 

 (1868). — E. X rw/f/ate, Gegenhaur, Griuidz. d. Vergleich. Anat. 438, fig. 112 a (1870) [tracheal syst.], 

 reproduced in Balfour, Comp. Embryol. i. 339, fig. 188 a (1880). 



Cloeon dimidiafum, Curt., Loud. & Edinb. Phil. Mag. (1834) 121 ; Hag,, Ent. Ann. (1863) 32.— C. 

 diinidiata, Walk., List of Nenropt. Ins. in Brit. Mus. part iii. 580 (1853). — C. russu/um, ! Etu., Trans. 

 Ent. Soc. Loud. (1871) 105, pi. v. 12 [detail] ; Hag. & Etn., op. cit. (1873) 400; Rostock, Jahresb. d. 

 Ver. f. Naturk. Zwickau, 1877, p. 81 (1878). 



CloeXpumila, !Ramb., Hist. Nat. d. Ins. Nevropt. 298 (1842).— C. dimidiata, Pict., Hist. Nat. 

 Nevropt. ii., Ephem., 272 (1843-5).— C. f iiocw/ff^ff, Blanchard, Metamorph. &c. des Ins. p. 127, fig. 

 (1868). 



ChJoeon dimidiatum, Lubbock, Trans. Linn. Soc. Lond. xxiv. 61-67, pis. xvii., x^dii. (1863), and op. cit. 

 XXV. 477-92, pis. Iviii., lix. (1865). 



Clo'eopsis t diptera, var., ! Etn., Ann. & Mag. of Nat. Hist. (3) xix. 401 (1867). 



Snbimago {living). — Wings extremely light greyish or greyish white, often tinged with 

 bright green [green oxide of chromium] along the stronger nervures. Setae ligbt 

 greyish. 



Imago {living).— 6 . Variation 1. Turbinate eyes Iloman-sej)ia brown. Thorax jet- 

 black above. Abdomen dark fuscous, with pale yellowish joinings, and with the tracheal 

 ramifications black. Setae white, with dull reddish joinings. Forceps white, light 

 blackish grey distally. Legs pale greenish-yellow, with light dusky tarsi. 



6 . Variation 2. Turbinate eyes dull lemon-yellow, or dull suljjhur-yellow ; lower eyes 

 fuliginose, or olive-grey, or glaucous. Thorax above pitch-brown, or fusco-luteous, or 

 brown-ochreous, or almost raw-sienna yellow. Abdomen in segments 2-6 or 7 translu- 



