British Ephemeridm. 5 



7. Baetis tbnax^ n. sp. 



cJ. Hind-wing broad, with the three longitudinal 

 nervures undivided, the third extending beyond the 

 middle of the inner margin : of the irregular veinleta 

 from the terminal margin, two between the second and 

 third nervures are the most distinct. Apical joint of the 

 limb of the forceps large and oval ; the second not quite 

 so long as the first, gradually lessening in thickness from 

 just beyond the base to the tip, nearly half as long as the 

 third joint, which is slightly contracted near the second 

 joining : sometimes there is a triangular toothlike pro- 

 jection just before the tip of the third joint on the inside ; 

 and an apical tuberosity on the inside of the first joint is 

 slightly roughened, as if with a view to lending an un- 

 usual tenacity tg the gripe of the forceps (whence the 

 name) . 



Length of body, S 8; fore-wing, 7; set. 16 mm. 



Hah. — Ashbourne Green, Derbyshire. June. 



8. Baetis buceratus, n. sp. 



$ . Hind-wing broad, with a well marked costal pro- 

 cess : the three longitudinal nervures are usually undi- 

 vided, but sometimes the second is forked; the third 

 nervure hardly reaches the middle of the inner margin. 

 Limb of forceps with a large obovate apical joint, the 

 second about two-thirds as long as the first, and one third 

 as long as the third joint: the first joint is large, swollen 

 on the inside at the tip; the second joint is rounded off 

 obtusely (something like the dome of a locomotive) 

 towards the third joint ; the third joint is contracted near 

 the base, and then suddenly curves inwards and down- 

 wards obliquely. 



Length of body, $ 8-9; fore- wing, 8; set. 10-16 mm. 



Hob. — The Kennet above Reading. April and May. 



Holding a specimen back downwards, with the setse 

 away from the eye, the forceps so far resemble the horns 

 of a bullock as to suggest the appellation buceratus. 



The next species resembles in colour B. pumilus, having 

 the turbinate eyes ( J" ) sooty ; thorax black above, polished ; 

 legs whitish ; abdomen somewhat fuscous or piceous, in 

 the male belted with white ; and the second longitudinal 



