1888. J 31 



25. Ccntroptilum pennulatwm, Eaton : Mon., 109, pi. v, 14, 14« [adult 



details] j Eevis., 176, pi. xvii, 305 [adult details] (1884 & 1885]. 

 Hind-wing obtuse. Turbinate $ eyes light orange-yellow. 

 Summer and autumn. Streams. 



26. Cloeon dipterum, Linne : Mon., 102, pi. v, 10 [forceps] ; Eevis., 



182, pi. xvii, 31a [adult details], and xlii, 22 [seta? of nymph] 



(1884 and 1885). 



Wing of $ mottled with amber along the costa ; $ wing colourless, with fewer 



(two or three instead of about ten) straight pterostigmatic cross veinlets. Penis (?) 



dart, acute. Turbinate eyes (in Great Britain) dull light reddish or reddish-brown. 



Summer. Ponds. 



27. Cloeon simile, Eaton : Mon., 103, pi. v, 11 [forceps] ; Eevis., 186, 



pi. xvii, 315 [adult details], and xlvii, 2 — 21 [details of nymph] 

 (1884 and 1885). 

 Wing in both sexes unadorned, and with numerous irregularly sinuate pteros- 

 tigmatic cross veinlets. Forceps limbs nearly contiguous at the base. Turbinate <J 

 eyes olivaceous or dark greenish-sulphureous. 



Summer and auturnn. Lakes. 



28. Cloeon rufulum, Miiller : Eevis., 188, pi. xvii, 31c [adult details], 



and xlvii, 1 and 4 [nymph and antenna] (1884 and 1885), = CI. 



russulum (misreading for rufulum), Cat., p. 9 ; Mon., 105, pi. v, 



12 [forceps]. 

 Wing in both sexes unadorned (unless, perchance, through slight infiltration of 

 chlorophyl), and with several (6 — 8) oblique, somewhat simple cross veinlets in the 

 pterostigmatic space. Forceps limbs distant at the base. Turbinate £ eyes some- 

 times sulphureous, sometimes reddish-brown. 



Summer. Ponds and ditches. 



29. Siphlurus armatus, Eaton : Mon., 126, pi. vi, 1, la [adult details] ; 



Eevis., 216, pi. xx, 34e [adult details] (1884 and 1885), = Siph- 

 lonurus armatus, Cat., p. 10. 



Pleura of £ abdominal segment nine broadly dilated oniscoidally, forming large, 

 acute, tooth-like projections behind. 9 unknown. 



Killarney and Middlesex. July. 



30. Siphlurus lacustris, Eaton: Mon., 126, pi. vi, 2 [forceps] ; Eevis., 



217, pi. xx, Md [adult details], pi. 1 (part) [nymph] (18S4 and 

 1S85), = Siphlonurus lacustris, Cat., p. 10. 



Pleura of very moderato proportions, forming only an inconspicuous tooth on 

 each side of the ninth $ abdominal segment. 



Hill streams and mountain lakelets. Wales to Scotland. Summer. 



