6 Rev. A. E. Eaton on Neiv 



nervure of the hind-wing forked. B. pumilus has the 

 apical joint of the limb of the forceps ovate or globular ; 

 the second joint nearly two-thirds as long as the third, 

 and slightly longer than the first. The fork of the second 

 nervure of the hind-wing encloses one simple veinlet 

 from the terminal margin ; and the third nervure extends 

 beyond the middle of the wing. 



9. BaETIS NIGER. 



Ephemera nigra, Linn. F. S. 377 (sub-imago) . 



S . Limb of the forceps with the apical joint subcy- 

 lindrical \vith rounded tip, and almost equal in dimensions 

 to the third joint ; the second is nearly twice as long as 

 the first joint, and is as long as the third. The fork of 

 the second nervure of the hind-wing usually encloses a 

 forked veinlet from the terminal margin ; and the third 

 nervure is absent. 



Length of body, ^ $ 6-7*5; fore-wing, S ? 6-7; 

 set. S 10-11, ? 6-8-5 mm. 



Hob. — The Kennet above Reading, &c. May, June and 

 September. 



In the Linnaean diagnosis, there is nothing to disprove 

 the identity of my insect with his Ephemera nigra ; there- 

 fore I have utilised the name. 



10. SiPHLONUKUS ARMATUS, n. Sp. 



c? . Thorax luteo-piceous above. Wings suffused with 

 greenish-gray; nervures piceous. Fore-legs piceous; 

 hinder legs luteous or furfurose. Abdomen fuscous 

 above, >vith the sides and joinings paler ; beneath luteous 

 or ochraceous, with a dark U-shaped streak under each 

 segment which is incomplete in the more forward seg- 

 ments : the last segment is produced into a flattened 

 spine on each side at the outward base of the forceps (as 

 in S. flavidus, Ed. Pict.) . 



Length of body, $ 14-15; fore-\ving, 16; set. 24-25 

 mm. 



Hah. — Killarney (Coll. McLachlan, captured by 

 Bouchard) ; Bishop's Wood, Hampstead (Wormald) . 

 July. 



Of this species I have seen only dried specimens. 



