EEV. A. E. EATON OX EECENT EPHEMEEID-E OR MAYFLIES. 345 



Plate LXI. 



Nymph of junior grade, perhaps of an Ecdyurus allied to E. renosus, but possibly of one 

 related more nearly to E. lateralis : see p. 277. 

 Figs. 1-17, all enlarged. — 1. Dorsal view of insect about | grown. 2. Ventral view of head and body 

 of the same. 3. Part of antenna, x 30 diam. 4. Labrum, x 35 diam. 5. Right mandible, 

 X 70 diam. 6. Left ditto. 7. First maxilla and palpus, x 35 diam. 8. Underside of labium, 

 2nd maxillse, and palpi, x 17 diam. 9. Dorsal view of tongue and paraglossse, x 30 diam. 

 10. Right intermediate leg, x 13 diam. 11-17. Tracheal branchiae of the abdomen, one of 

 every pair, numbered consecutively from in front, x 35 diam. (In alcohol.) 



Plate LXII. 



Ecdyurus fluminum [ — angustlpennis, figs. 1 & 4—23], E. venosus [figs. 2 & 3], and another [perhaps 

 a junior grade of E. venosus, or perhaps of E. lateralis, figs. 24 & 251. Nymphs. 



Figs. 1-25, all enlarged. — 1. Dorsal view of insect of moderately advanced grade. 2. Ventral view 

 of head and body of another of very advanced grade. 3. Face of the same. 4. Antenna, 

 X 30 diam. 5. Labrum, x 20 diam. 6. Right mandible, x 50 diam. 7. Part of the left 

 ditto. 8. First maxilla and palpus, x 20 diam. 9. Point of the lacinia of the same, x 170 

 diam. 10. Underside of labium, 2nd maxilUe, and palpi, x 20 diam. 11. The same reversed, 

 X 20 diam. 12. Dorsal view of tongue and paraglossje, x 20 diam. 13-15. Right legs, one 

 of each pair, numbered successively from the foremost, x 10 diam. [In the original drawings 

 the markings were not shown in any of these figures, the specimens being faded ; but 

 subsequently the markings of a newly killed specimen of E. renosus were introduced into 

 fig. 13.] 16-22. Tracheal branchiae of the abdomen, one of every pair, numbered consecutively 

 from in front, x 20 diam. 23. Median and right caudal setae, x 7 diam. 24. Dorsal view of 

 insect of junior grade. 25. Right tracheal branchiae of the 3rd pair of the same, x 40 diam. 

 [E. fluminum in fluid; the others in alcohol.) 



Plate LXIII. 



Figs. 1-13. Hexayenia, sp. Nymph. Supplementary to PI. XXIX. Figures all enlarged. — 



1. Antenna, x 20 diam. 2. Exterior of labrum, x 25 diam. 3. Right mandible, x 20 diam. 



4. Left ditto. 5. First maxilla and palpus, x 25 diam. 6. Underside of labium, 2nd 



maxillae, and paljDi, x 25 diam. 7. The same reversed [showing only the bases of the palpi]. 



8. Dorsal view of tongue and paraglossae, x 20 diam. 9. Right fore leg, x 9 diam. 



10. Ditto in reverse. 11 & 12. The other right legs, numbered consecutively, x 9 diam. 



13. Tracheal brancliire of the 1st abdominal pair, x 25 diam. (In alcohol.) 

 Figs. 14-17. Ephemera; forceps of adult ,-J of four species. Supplementary to PI. VIII. Figures all 



enlarged.^ — 14. E. compar (dried). 15. E. guttulata (dried). 16. E. simulans, with the 



penis-lobes (in alcohol). 17. E. varia, with the penis-lobes (dried). 



Plate LXIV. 



Supplementary to earlier Plates. Figures 3-8 drawn by A. T. Hollick ; the other 

 figures by the Author. All enlarged. 



Figs. 1, la. Atalophlebia fasciata [Supplemental to PI. X.]. — 1. Penis of adult 6 in profile; 1 a. Ditto, 

 supine. 



46* 



