340 EEV. A. E. EATON ON RECENT EPHEMEEID^ OR MAYFLIES. 



placed to display the molar surface, x 50 diam. 12. First maxilla and palpus, x 100 diatn. 

 13. Underside of labium, 2nd maxillae, and palpi, x 100 diam. 14. Dorsal view of tongue and 

 paraglossse, x 50 diam. 15-17. Legs numbered successively from in front, X 35 diam. 

 18-20. Legs of C Harrisella correspondingly numbered, x 20 diam. 21. Foremost right 

 tracheal branchia of the abdomen of the same, x 30 diam. 22-26. Left tracheal branchiiB of 

 the remaining abdominal pairs of C. halteraia numbered consecutively from the foremost (the 

 first of them, fig. 22, reversed), x 35 diam. 27. Exterior of the right tracheal branchia of the 

 2nd abdominal pair of C. Harrisella, x 30 diam. 28. Caudal setae of the same, x 20 diam. 

 [The terminal segment in this figure appears to be of questionable form.] (The named 

 nymphs were English specimens preserved in the glycerine water-and-spirits solution; the 

 Portuguese nymph was in an alcoholic solution.) 



Plate XLIII. 



Prosopistoina foliaceum. Nymph. 



Figs. 1-12, all enlarged. — 1. Dorsal view of $ insect at rest, with setae partially retracted. 2. Ventral 

 view of the same, with the right legs cut off and the left legs slightly displaced to show the 

 depressions in which the femora are laid. 3. Antenna, x 100 diam. 4. Labrum and clypeus, 

 X 45 diam. 5. Eight mandible, furnished with an unusually long endopodite, x 90 diam. 

 6. First maxilla and palpus, x 90 diam. 7. Underside of labium and mentum, x 25 diam. 

 8. Underside of labium and 2nd maxillary palpi, x 65 diam. 9. Fore leg, x 40 diam. 

 10. Spinules of fore tibia, x 210 diam. 11. Intermediate leg, x 40 diam. 12. Hind leg, 

 x 40 diam. (From Dr. E. Joly, captured at Toulouse; in alcohol.) 



Plate XLIV. 



Baetis rhodani. Nymph. 



Figs. 1-20, all enlarged. — 1. Dorsal view of ? insect of very advanced grade in repose (the legs not quite 

 in perspective). 2. Side view of head of the same. 3. Oblique under front view of the same, 

 x 35 diam. 4. Antenna, x 35 diam. 5. Exterior of labrum, x 35 diam. 6. First maxilla 

 and palpus, x 70 diam. 7. Right mandible and tendon, x 70 diam. 8. Left ditto. 

 9. Underside of labium, 2nd maxillae, and palpi, x 35 diam. 10. Dorsal view of tongue and 

 paraglossae, X 35 diam. 11-13. Legs numbered consecutively from the foremost, x 25 diam. 

 14^20. Right tracheal branchiae of every abdominal pair numbered consecutively from the 

 foremost, x 35 diam. (In alcohol.) 



Plate XLV. 



Nymph allied to Ce7i(roptilum, from Peru. 

 Figs. 1-19, all enlarged. — 1. Dorsal view of insect of advanced grade. 2. Ventral view of the same. 

 3. Part of antenna, x 40 diara. 4. Laln-um, x 50 diam. 5. Right mandible and tendon, 

 X 75 diam. 6. Left ditto. 7. First maxilla and palpus, x 50 diam. 8. Underside of 

 labium, 2nd maxillae, and palpi, x 40 diam. 9. Dorsal view of tongue and paraglossae, x 50 

 diam. 10-12. Left legs numbered consecutively, X 25 diam. 13-18. Right tracheal branchiae, 

 one of every abdominal pair, nvimbered consecutively from the foremost, x 40 diam. (In 

 alcohol.) 



