1 ND E X. 



'Additions and CoiTcctious,320,346. 

 American sp. of Centroptilum, 179 ; 



CloiJon, 190. 

 Analysis gen. Leptophlebia type, 



82 ; of Groups, Genera, &c., 309. 

 Analytical index to descrip. and 



illus. of Nymphs, 317. 

 Asiatic sp. of Ecdyurus, 2S1 ; Hep- 



tagenia, 268. 



Baetis, Central and S. Amer. sp. 

 of, 170 ; European sp. of, 158 ; 

 Indian and Cingalese sp. of, 171 ; 

 N.-Amer. sp. of, 168. 



Central and S.-Amer. sp. of Baetis, 



170. 

 I!entroptilum, American sp., 179. 

 Characters as basis of classification 



not fundamental, 17. 

 ^iugalese sp. of Cloeon, 181. 

 -loeon, Amer. sp., 190; Cingalese 



sp., 181 : European sp., 182. 

 >08s-veiulets, 6. 

 'olour, definition shades and tints 



of, 1. 

 Conspectus of classification, 21. 



Icdyurus, N.-Amer. sp. of, 278 ; 



European and Asiatic sp. of, 281. 

 igg and Oviposition, 11. 

 European sp. of Baetis, 158 ; Cloeon, 



182 ; Ecdyurus, 281 ; Heptageuia, 



268 ; Ehithrogena, 255 ; Siphlu- 



lus, 216. 



Forceps, of male, 8. 

 Fore wings, shape, 3; their nerv- 

 ures, 5. 



Genera, group I., 22 ; group II., 



77 ; group III., 199. 

 Geographical distrib. of Ephemer- 



idse, 307. 



Habits of Mayflies, 8. 

 Hairs and hairy covering, 17. 

 Heptagenia, N.-Amer. sp. of, 266, 



323 ; European and Asiatic sp. 



of, 268. 

 Hind wings, shape, 3. 

 History classification of Ephemer- 



idse, 18. 



Indian and Cingalese sp. of Baetis, 



171. 

 Introductory Eemarks, 1. 



Legs, peculiarities of, 8, 234, 236, 

 325. 



Nervures, fore w ing, groups of, 5 ; 



hind wing, groups of, 6. 

 North-Amer. sp. of Baetis, 168 ; 



Ecdyurus, 278 ; Heptagenia, 266 ; 



Ehithrogena, 252; Siphlurus,218. 

 Nymph, habits of, 12 ; characters 



and peculiarities of, 13. 



Ocelli, size of, 3. 

 Oviposition and the Egg, 11. 



Peculiarities, structural details, 



sexes, 3. 

 Pseudimago, as a term, 17. 



Ehithrogena, N.-Amer. sp. of, 252 ; 

 European sp. of, 255. 



Siphlurus, European sp., 216; N.- 

 Amer. sp., 218. 



Structure, Ephemerida in general, 

 o 



Subimago, term now used, 17. 

 Systematic descrip. of genera and 

 species, 22. 



Tabular classif. of genera, 21. 



Tabulation, gen. Siphlurus type, 

 200; generic identification adults, 

 type of Ecdyurus, 236 ; Nymphs, 

 type of Baetis, 155 ; of Ecdyurus, 

 235 ; of Ephemerella, 123. 



Term Nymph, how employed, 12. 



Tracheal branchiae, 15 ; respiration, 

 other organs, 16. 



Wing-membrane, structure of, 3. 

 Wing-neuration, 4. 



Young of Ephemeridse, 12. 



For the Alphabetical list of Genera and Species see pp. 3-18-352. 



