192 SUPPLEMENT. 
It seems to be distinguished by the longer head (42 in the length of the fish) and the shorter humeral 
process (not extending beyond the anterior 3 of the pectoral spine). 
Hab. Guatemata, Lake Amatitlan |}. 
Rhamdia rogersi (p. 136). 
To the synonymy add :— 
Rhamdia regani, Meek, Publ. Columbian Mus., Zool. vii. 1907, p. 144°. 
Costa Rica, Turrialba 2 and Rio Tiribi, San José 2. 
CONORHYNCHUS (p. 138). 
I learn from an editorial footnote that the name Conorhynchus is preoccupied. 
I propose to substitute for it the name Conorhynchichthys. 
1 (A). CYCLEPTUS, Rafin., 1819. (To precede Moxostoma, p. 146.) 
Cycleptus, Jord. & Everm, Bull. U.S. Nat. Mus. xlvii. 1896, p. 168. 
Scarcely distinct from Ictiobus, but with a much shorter head (length 6 to 84 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. 
Catostomus elongatus, Le Sueur, Journ. Ac. Philad. i. 1817, p. 103°. 
Sclerognathus elongatus, Giinth. Cat. Fish. vii. p. 23 (1868) °. 
Cycleptus elongatus, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 168°; Meek, Publ. 
Columbian Mus., Zool. vii. 1907, p. 154°. 
Hab. Unirep States, Mississippi System }? °—Mexico, Rodriguez in Nuevo Leon 4. 
