CONTENTS. XI 



Page. 

 Order IV. Physostonii or Malacopteri — Continued. 



Leucosoraus — 2.'iO 



1. Leucosoraus dissimilis ... 250 



2. Leucosoraus pallidus .. 251 



.S. Leucosoraus incrassatus-. -. .- --- — 252 



4. Leucosoraus raacrocephalus - 252 



Ceratichthys - -- 25.? 



Nocomis — 254 



Nocomis nebrascensis - - 254 



Hybnpsis - 255 



Tribe of Alburni - 255 



Exoglossum 255 



Exoglossura mirabile .. 256 



Cliola 256 



1. Cliola vigilax 257 



2. Cliola velox 258 



3. Cliola vivax 258 



Alburnellus 259 



1. Alburnellus dilectus 259 



2. Alburnellus umbratilis 260 



Alburnops 260 



L Alburnops blennius 261 



2. Alburnops shumardi , 261 



3. Alburnops illecebrosus 262 



Plargyrus 263 



Plargyrus bowmani 263 



Cyprinella .... 2 64 



1. Cyprinella bubalina . . 265 



2. Cyprinella umbrosa 266 



3. Cyprinella gunnisoni 267 



4. Cyprinella bcckvvithi. 267 



5. Cyprinella suavis 268 



6. Cyprinella lepida 268 



7. Cyprinella notata 269 



8. Cyprinella whipplii 270 



9. Cyprinella lugubris . ... .. 271 



10. Cyprinella ludibunda 271 



Moniana 272 



1. Moniana lutrensis 272 



2. Moniana leonina 273 



3. Moniana deliciosa 274 



4. Moniana laetabilis 275 



5. Moniana pulchella . 275 



6. Moniana frigida . . 276 



7. Moniana tristis 277 



Eichardsonius 278 



1 . Riehardsonius balteatus ... ... ..... 278 



2. Riehardsonius lateralis ; 279 



Luxilus - - - 280 



1 . Luxilus occidentalis 280 



2. Luxilus seco 281 



3. Luxilus lucidus - 282 



Scmotilus 283 



Semotilua spcciosus 283 



Hudsonius 284 



