338 Fishes from the Monongahela River. 



We have compared specimens of hudsonius and the supposed 

 amarus from different localities and believe them to be identical. 

 An examination of the teeth of a number of specimens shows 

 that the difference, 1, 4-4, or 1, and 2, 4-4 2 or 1, is too va- 

 riable to be considered a reliable character. The caudal spot, 

 prominent in the young, is most persistent in those specimens 

 from sluggish and reedy streams, and we are convinced that this 

 and other color characters depend simply upon the nature of 

 the streams which the particular individuals inhabit. 



We have examined numerous specimens from the following- 

 localities : Potomac River, U. S. Fish Coram. Carp Ponds, 

 Kankakee River, Lake Michigan, Manhattan, Kans., and the 

 Monongahela. 



In this connection we wish to say that an examination of con- 

 siderable material leads us to ngvee with Profs. Jordan and Gil- 

 bert in making Ceratichthys lucens equal to Rutilus storerianus 

 Kirtland. Among the specimens examined, is one which was 

 collected by Prof. Baircl and Dr. Kirtland in Yellow Creek, 

 Ohio, in August, 1853. In this specimen, the barbel is very evi- 

 dent. The synonymy of these species has been greatly confused 

 heretofore, and it is with the hope of clearing up the confusion 

 as much as possible that w r e have given the synonymy of J\ T . hud- 

 sonius so far as we have been able to determine it. 



14. Notropis whipplei (Girard). (261.) 



Very common at all places seined. 



15. Notropis mrgalops (Rafinesque). (273.) 



Silverside. 

 Very common everywhere, 



16. Notropis jejunus (Forbes). (288.) 



But two specimens from Lock No. 9. These we have compared with 

 Forbes's type and find them identical. 



17. Notropis atherinoides Rafinesque. (308.) 



Two specimens. 



18. Notropis rubifrons (Cope). (310.) 



The collection contains but two specimens, which are from Pigeon 

 Creek. 



19. Ericymba buccata Cope. (314.) 



Three specimens in the collection. 



