CONTENTS. XT 
Page. 
Order IY, Physostonri or Malacopteri—Continued. 
Leucosomus_ 250 
1. Leucosomus dissimilis___-_ 250 
2. Leucosomus pallidus_....___.......- 251 
3. Leucosomus incrassatus.. ..._ 252 
4. Leucosomus macrocephalus___ 252 
Ceratichthys____ 253 
Nocomis_-___ 254 
Nocomis nebrascensis_ 254 
Hybopsis_ 255 
Tribe of Alburni ...___..._...-------- 255 
Exoglossum___ 255 
Exoglossum 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 
1. Alburnops blennius_ 261 
2. Alburnops sliumardi_....___ 261 
3. Alburnops illecebrosus_ 262 
Plargyrus_ 263 
Plargyrus bowmani_ 263 
Cyprinella_ 264 
1. Cyprinella bubalina_ 265 
2. Cyprinella umbrosa_ 266 
3. Cyprinella gunnisoni_ 267 
4. Cyprinella bcckvvitbi_ 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 
Richardsonius_ 278 
1. Richardsonius balteatus_,___ 278 
2. Richardsonius lateralis_ 279 
Luxilus...__ 280 
1. Luxilus occidcntalis_ 280 
2. Luxilus seco ..._ 281 
3. Luxilus lucidus_ 282 
Semotilus_ 283 
Semotilus speciosus. 283 
Hudsonius_ 284 
