EEV. A. E. EATON ON RECENT EPHEMERIDJ;: OE MAYFLIES. 177 



duced forwards at tlie sides in the form of triangular spots ; tracheae dark ; venter 

 spotless, pale, coloured in segments 8 and 9 with light ochraceous tinged slightly by the 

 pleurse with Mars-orange and reddish. Femora whitish amber ; tibiae greyish white ; 

 tarsi dark grey, with black ungues. Setae white. Wings vitreous ; the marginal area 

 of the fore wing, beyond the bulla, contains in the pterostigmatic region of 2 11-18 

 sub-simple and nearly straight cross veinlets ; in that of 6 are 7-8. Length of body or 

 wing 8-9 ; seta?, d ira. 14-17, 2 im. 11 mm. 



Sab. Great Britain, from near Lumi^hanan in Aberdeenshire southwards ; common 

 near Thorncombe, Dorset, in June, and generally in trout-streams from August to 

 October. Hind wing somewhat ligulate, with the tip elliptical. Forceps-limbs close 

 together at the base ; their terminal joints pyriform, slightly incurved, smaller, and 

 narrower towards the base than in C. luteoluni. The edge of the penis [or penis cover ?] 

 is saliently curved. 



CbNTROPTILUM NEMOllALE, sp. UOV. 



Imago {living). — 6 . Turbinate eyes intense Mars-yellow {peropace testaceus of 

 Miiller's code) on the summit, jjaler at the sides; lower eyes olive-grey. Notum very 

 light fusco-ochraceous ; the first dorsal abdominal segment more fuscous. Abdominal 

 segments 2-6 translucent Avhite, their dorsal terminal margins, like segments 7-9, brown- 

 ochre ; segment 10 rather yellower than these ; venter in segments 7-10 whitish ochre. 

 Forceps (the limbs are nearly in mutual contact at the base), setse and legs translucent 

 white ; femora very faintly tinged with yellowish just at their distal extremities. Wings 

 vitreous ; in the pterostigmatic portion of the marginal area of the fore wing are 1-5 

 simple cross veinlets with indistinct rudiments of one or two others. Length of body 

 6'5 ; wing 7 ; setae 14 mm. 



Sab. Italy ; in the chestnut-wood below Gaviuana, San Marcello, Apennino Pistojese, 

 near a streamlet (2550-2750 ft.) ; captured, by beating, at about 10 a.m., 26 July. The 

 hind wings and 6 genitalia resemble those of C. penmilatum ; but the colour of the tur- 

 binate oculi, and the smaller number of cross veinlets in the pterostigmatic portion of 

 the fore wing sufiice to distinguish C. nemorale. 



Centroptilum pulchrum, sp. nov. 



Imago {living). — d. Turbinate eyes bright chrome-lemon yellow; lower eyes light 

 olive-grey or olive-green. Notum furfuraceous or raw sienna, with the peak of the 

 mesonotum chrome-lemon. Abdomen in segments 2-6 perspicuous, narrowly tinged 

 with raw sienna by the joinings at the tips ; the other segments above either brown-ochre 

 modified with Chinese orange, or else raw sienna, with the usual pale paired dorsal 

 lines ; venter in segments 7-10 very light brown ochre or yellow ochre in the middle, 

 setae translucent white; forceps dull whitish. Femora white; tibite and hinder tarsi 

 greyish white ; the smaller ungues black. Wings vitreous ; in the pterostigmatic por- 

 tion of the marginal area of the fore wing are 4-10 almost invariably simple cross 

 veinlets. 



$ {dried). — The colour-differences of this sex are quite of the ordinary description, 



5EC0ND SERIES. — ZOOLOGY, VOL. III. 24 



