346 EEV. A. E. EATON ON RECENT EPHEMERID.E OR MAYFLIES. 



Figs. 2,2 a. Habrophlebia fusca [Suppl. to PI. XIII. 22«].— 2. Fore leg of adult ? . 2 a. Tarsus of 

 ditto, more enlai-ged. 



Fios. 3-8. Abdominal tracheal branehiaj of a nameless N. -American nymph, allied to Ephemerella 

 [Suppl. to PL XL. 18-20]. — 3-7. One of every pair, numbered consecutively from the fore- 

 mast, viewed prone. 8. One of the 2nd pair, supine. All enlarged 30 diam. 



Figs. 9-20. Genitalia of adult ^ Ba'ctis [Suppl. to PI. XVI. 29]. — 9. B. scambus, forceps-limb. 

 10. B. vemistulus, ditto. 11. Penis of the same. 12. B. rhodani, forceps-limb. 13. B. 

 Bocaffii, ditto. 14. B. gemellus, ditto. 15. B. Atrebatinus, ditto. 16. B. tenax, ditto. 

 17. B. melanonyx, ditto. 18. B. alpinus, ditto. 19. B. buceratus, ditto. 20. B, pumilus, 

 ditto. 



Fig. 21. Ctntroptilum Udeolum, fore leg of ? adult [Suppl. to PL XVII. 30]. 



Figs. 22-24-. Ameletus, tarsus and forceps-basis [Suppl. to PL XVIII. ? 34]. — 22. A. dissitus, forceps- 

 basis. 22 a. Hind tarsus. 23. A. subnotatus, {orce]^s-hasis. 24. A. exquisitus, ditto. 



Fig. 25. Dipieromimns tipuliformis, hind wing [Suppl. to and corrective of PL XX. 35]. 



Fig. 26. Siphlurus occidentalis, forceps-basis [Suppl. to PL XX. 34]. 



Plate LXV. 



Supplemeatary to earlier Plates. Figures of details, all enlarged, drawn by the Author. 



Fig. 1. Bleptus fasciatus : — limbs, hinder tarsi, and liind wing of adult ^J [Suppl. to PL XXIV.]. 



Figs. 2 & 3. Iron : — ventral views of adult J* genitalia, dried [Suppl. to PL XXIV. 44] . — 2. /. longi- 

 mauus. 3. /. ii'itidus. 



Figs. 4 & 5. Cinygma: — -veutj-al views of adult <^ genitalia, dried [Suppl. to PI. XXIV.]. — 4. C. inte- 

 grum. 5. C. par. 



Fig. 6. Rhithrogena aiirantiaca. nymjih [Suppl. to PL LIV. 8] . Fangs of the right mandible, viewed 

 from above, under pressure, enlarged 173 diameters. 



Fig. 7. Epeorus psi : — ventral view of adult ,^ genitalia, in alcohol [Suppl. to PL XXIV. 44 a]. 



Fig. 8. [Suppl. to Pis. XII. & XIII.]. — Hind wing of a nameless N. -American insect in Mus. Comp. 

 ZooL, Cambridge, Mass., ticketed No. 78, Kentucky, 7. iii. 1882. 



Fig. 9. Ephemerella notata : — ventral view of adult ^ genitalia (living) [Suppl. to PL XIV.]. 



Figs. 10 & 11. Ba'etis: — hind wings [Suppl. to PL XVI.]. — 10. B. consuetus. 11. B. solidus. Enlarged 

 106 diameters. 



Fig. 12. Ceniroptilum Putyi: — hind wing [Suppl. to PL XVII. 30]. Enlarged 137 diameters. 



Fig. 13. Ameletus inopinatus : — ventral view of adult J" forceps, dried [Suppl. to Pis. XVIII. ? 34 and 

 LXIV. 22-24]. 



Additions and Corrections (coutinued from p. 325). 



P. 282, 1. 18 from bottom, for venosus read venosa. 

 P. 302, 1. 12 from top, before fuscus insert ||. 



P. 315, 1. 20, for Culuhiu-us [preoccupied in Entomology] read Coloburiscus. 

 P. 320, before 1. 7 from bottom iii3iTt : — P. 142, after 1. 10 from top read 



Synonymy. Brachycercas, Curtis (1834), applicable only to 5 and subimago specimens. Jlacrocemts, Westwooii, 

 Partington's Brit. Cycloped. ii. 439 (1830), appropriate only to the (S im. 



