BEV. A. E. EATOiV ON EECENT EPHEMERID^ OR MAYFLIES. 331 



Figs. 24 bis. Tel. tristis : — wings, with a more enlarged view of the hind wing. 



Fig. 25. Wing of a nameless Malay species of Tricorythus, received from Mr. Ritsema. [The ciliation 

 of the wing is rather too dense.] 



Fig. 25 bis. L. exhn'ms : — wing. 



Figs. 26 fl. C. haltcrata : — legs (1-3) of ? and fore legs of $ , with a more enlarged view of the ? hind 

 tarsus ; underside view of genitalia ; vertical view of adult J head, shaded, with the pi'onotum 

 in outline, showing the very great disproportion in size between the anterior ocellus [visible in 

 front], and the hinder ocelli [protuberant above the orbits of the eyes] (freshly killed). 



Figs. 26 6. C. dinidiata : — wing; underside view of genitalia (freshly killed). 



Figs. 27. P. ptmctifrons [foliacetini] : — wings of the reputed adult (preserved in fluid) after Vayssiere, 

 but not facsimile. 



Plate XVI. 



Neuration and (J forceps of 28. CaUibcetis and 29. Ba'etii; also femoral mai'kings of some species of 

 the former genus, and head of adult (^ Baiitis : — all enlarged. 



Figs. 28 a. C. Hageni :— fore wing and a more enlarged view of the hind wing ; part of a femur. 



Figs. 28 b. C. ferrugineus : — fore wing, and a more enlarged ^dew of the hind wing of ? im. 



Figs. 28 c. C. pictus : — wings, with a more enlarged view of the hind wing ; two femora. 



Figs. 28 d. C. montanus : — wings, with a more enlarged view of the hind wing; a femur. 



Figs. 29 a. B. Salvini : — wings, with a more enlarged view of the hind wing : underside view of foi'ceps 



(dried) . 

 Figs. 29 b. B. binoculatus : — wings, with a more enlarged \dew of the hind wing ; iinderside view of 



forceps (freshly killed). 

 Figs. 29 c. B. rhodani : — hind wing, much enlarged ; head of cj viewed obliquely from above in front, 



and the same viewed from the side, showing the form of the composite oculi, and the inequality 



of the ocelli, described at p. 153 (freshly killed) . 

 Fig. 29 d. B. vermis : — underside view of forceps (freshly killed) . 

 Fig. 29 e. B. pwmilus : — hind wing, much enlarged (freshly killed) . 

 Fig. 29/. B. niger : — underside view of forcei^s (freshly killed). 



I Plate XVII. 



Limbs of 28. CalUbmtis, 29. Bai'tls, 30. Centroptilum, and 31. Clo'eon; wings and forceps of CV«//-o- 

 ptilum and Clo'eon, and adult (J head of the former : all enlarged. 



Figs. 28. C. ferrugineus : — legs (1-3) of ^ , fore leg of ? (dried). 



Figs. 29. jB. rhodani : — legs (1-3) of J" and fore leg of ? , with the hinder tarsi of the ? on a corre- 

 sponding scale of enlargement. 



Figs. 30a. C. luteolum : — wings, with a more enlarged view of the hind wing; underside view of the 

 forceps ; head of adult <J from in front, and also from the side, showing the composite form 

 of tlie oculi and the disparity in size between the foremost and the hinder ocelli, described at 

 p. 153 (freshly killed) . 



Figs. 30 6. C. p ennui alum : — hind wing, much enlarged ; legs (1-3) of J"; underside view of forceps ; side 

 view of (J head (freshly killed) . 



b'ig. 30 c. C. tenellum : — underside view of forceps (preserved in fluid). 



Figs. 31 a. C. diptertim : — fore leg and hinder tarsi of $ ; underside view of forceps (freshly killed). 

 Figs. 316. C. simile: — wing ; legs (1-3) of ^ ; underside view of forceps (freshly killed). 

 Fig. 31 c. C. rufulum: — underside view of forceps (freshly killed). 



"'ig. 31 d. C. bimaculatum : — wing [in the pterostigraatic region, the front of tlie wing (through accident 

 on the part of the author) is slightly displaced] . 



