192 SUPPLEMENT. 



It seems to be distinguished by the longer head (43^ in the length of the fish) and the shorter humeral 

 process (not extending beyond the anterior g of the pectoral spine). 



Hah. Guatemala, Lake Amatitlan '. 



Rhamdia rogersi (p. 136). 



To the synonymy add : — 

 Rhamdia rcgani, Meek, Publ. Columbian Mus., Zool. vii. 1907, p. 144". 

 Costa Rica, Turrialba ^ and Eio Tiribi, San Jose 2. 



CONORHYNCHUS (p. 138). 



I learn from an editorial footnote that the name Conorhynchus is preoccupied. 

 1 propose to substitute for it the name Conorhynchichthys. 



1 (a). CYCLEPTUS, Rafin., 1819. (To precede Moxostoma, p. 145.) 

 Cycleptus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 168. 



Scarcely distinct from Ictiohus, but with a much shorter head (length 6 to 8| in the length of the fish) and 

 smaller scales (55 to 60 in a longitudinal series) than any species of that genus. 



A single species. 



1. Cycleptus elongatus. 



Cutostomus elongatus, Le Sueur, Journ. Ac. Philad. i. 1817, p. 103'. 

 Sckrognathus elongatus, Giinth. Cat. Fish. vii. p. 23 (1868) ^ 



Cycleptus elongatus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 168 ' ; Meek, Publ. 

 Columbiaa Mus., Zoo), vii. 1907, p. 154 \ 



Hab. Ujs'ited States, Mississippi System ^ - s. — Mexico, Rodriguez in Nuevo Leon'*. 



