4 Rev. A, E. Eaton on New 



undivided; each limb of the forceps has the apical joint 

 small, globular, second joint about four-fifths as long as 

 the first, nearly half as long as the third, rounded off 

 obtusely towards the tip. (N.B. The proportionate lengths 

 of the forcipal joints are slightly variable in every species.) 



5. Baetis Ateebatinus, n. sp, 



$ . Hind-wing narrow, destitute of the costal process, 

 with only the first two longitudinal nervures ; the third 

 nervure is irregularly mai-ked out by granulations. Limb 

 of the forceps with a large and globular apical joint ; second 

 joint nearly as long as the first, gradually lessening in 

 breadth towards the tip, and about half as long as the 

 third joint. The limbs of the forceps are inserted rather 

 closely together ; and in the middle of the protuberance 

 of the last segment, and above them, is a shallow pit con- 

 taining a prominent short dark point. 



Length of body, c? 7, ? 8 ; fore-wing, $ 6-7, $ 8 ; 

 set. c? 11-13, ? 8-10 mm. 



Ilab. — The Kennet near Burghfield Bridge, Reading. 

 October. 



I have given to this species a geographical name. The 

 Atrebatii occupied the neighbourhood of Silchester. 



6. Baetis ph.5:ops, 

 Baetis 'phceopa, Ste. Cat. 336, n. 3394 ( $ sub-imago). 



Hind-wnng broad, with a well marked costal process, 

 and three undivided longitudinal nervures, between the 

 first two of which are some irregular delicate veinlets 

 from the terminal margin; the third nervure attains to 

 the middle of the inner margin at the least. First joint 

 of the limb of the forceps with an oval apex, large; second 

 joint gradually lessening in thickness from the base to 

 the tip, nearly as long as the first, half as long as the 

 third; third joint slightly contracted near the second 

 joining. 



Length of body, S 'i Q-^; fore-wing, ^ 6-7, ? 7-9; 

 set. $ 14-16, ? 10-12 mm. 



Hah. — Great Britain (common at Bab worth near Ret- 

 ford, Notts.); Norway (Hauimerfest and Alten). May, 

 June ; September and October. 



