334 EEV. A. E. EATON ON EECENT EPHEMEEIDiE OR MAYFLIES. 



Figs. 44 A. Ep. torrentium : — legs (1-3) of ^ and fore leg of ? , with more enlarged views of the corre- 

 sponding tarsi ; underside view of penis (fresUj' killed) . 



Figs. 45. H. sulphurea :■ — legs (1-3) of J' and fore leg of ? , with more enlarged views of the corre- 

 sponding tarsi ; underside view of penis (freshly killed). 



Figs. 45 a. H. gallica : — fore tarsus and intermediate tarsus of ? ; underside view of penis (dried). 



Figs. 46. Ec. venosus : — legs (1-3) of ^ and fore leg of ? , with more enlarged views of the corresponding 

 tarsi ; underside view of penis, with the lobes held somewhat apart (freshly killed) . 



Fig. 46 a. Ec. helveticus : — fore tarsus of ^ (dried) for comparison with the corresponding figure of the 

 same tarsus of Ec. venosus. 



Fig. 46 6. Ec." qucesitor" [ = j;cwo«/s, var.] : — underside view of penis (freshly killed) with the lobes 

 rather close together. 



Fig. 46 c. Ec. italicus : — underside view of penis (freshly killed) with the lobes closed together. 



Fig. 46 d. Ec. insignis : — corresponding view of penis (freshly killed) suffused with seminal fluid. 



Plate XXV. 



Figs. 1-19. Palingenia [Anar/enesia) , sp. — Nymph. Figures all enlarged. — 1. Dorsal view of insect 

 about §rds grown. 2. Ventral view of the thorax and abdomen of the same. 3. Side view of 

 the head and prothorax, x 11 diam. 4. Underside view of head, x 11 diam. 5. Antennae 

 and frons, x 13 diam. G. Antenna, x 45 diam. 7. Labrum, upper surface. 8. Left man- 

 dible, viewed from below, x 25 diam. 9. The same, viewed from above, x 25 diam. 10. Eight 

 1st maxilla and palpus, x 25 diam. 11. Eight 2nd maxilla and palpus, x 20 diam. 12. Dorsal 

 view of the tongue and its lateral lobes or paraglossre, x 25 diam. 13. Left fore leg, viewed 

 from liehind. 14. Front view of the same. 15. Tarsal claw of the same, more enlarged. 

 16. Intermediate leg. 17. Hind leg. 18. Eight tracheal branch ia of the 1st pair, or of the 

 2nd abdominal segment, spread out to show the arrangement of the fringes, x 10 diam. 

 19. Eight tracheal brauchia of the 2nd pair, x 13 diam. (From Ceylon, in alcohol.) 



Figs. 20-24. Pulbiyema, sp. — Nymph. Figures all enlarged. 20. Dorsal view of the insect in an 

 advanced stage of growth, with the head and pi-othorax slightly dislocated. 21. Ventral view 

 of the head and body of the same. 22 and 23. Eight tracheal branchia of the 3rd pair or 4th 

 abdominal segment, with the divisions spread to show the fringes in 22, and closed together in 

 23, X 13 diam. 24. Dorsal view of two of the caudal set;c, x 12 diam. (From Brazil, in 

 alcohol.) 



Plate XXVI. 



Oliffoneuria rhenana. Nymph. 



Figs. 1-20 all enlarged. — I. Dorsal view of insect, nearly approaching the last moult, in the attitude 

 of repose. 2. Ventral view of the head aud body of a rather younger, but also nearly adult 

 specimen, x 3 '5 diam. 3. Side view of the head, showing the tuft of fibrils of the tracheal branchia 

 annexed to the 1st maxilla, x 8 diam. 4. Vertical view of the head of the same ? , of advanced 

 age (A). 5. Vertical view of the thorax and a few of the anterior segments of the abdomen of 

 the younger specimen B, showing the hood formed by membrane uniting the terminal mai'gins of 

 the fore wings. 6. Diagrammatic side view of the thorax aud anterior abdominal segments of 

 specimen A, showing the position and relative sizes of the 1st aud 2nd abdominal tracheal 

 branchiae. 7. Antenna, x 30 diam. 8. Labrum, x 30 diam. 9 and 10. Left and right 

 mandibles, x 30 diam. II. Left 1st maxilla aud palpus, with the annexed fascicle of branchial 

 fibrils, X 30 diam. 12. The same, reversed, without the fibrils. 13. Interior view of labium, 

 lower maxillte, aud palpi, x 15 diam. 14. Tongue and paraglossa;, from above, x 30 diam. 



