Jordan a)id Rvermann. Fishes of North America, 151 



I'imclodH* mujnei-i, Gi'NTHER, Fishes Cent. Am., 474, 1809, Atlantic and Pacific rivers of 



Panama. 



HhHiiKi;,/ l>rii,<i'->,<li, GILL, Proc. Ac. Nat. Sci. Phila., 1876, 337, Panama. 

 Jtltiinidiit WHi/neri, EiGKNMANN, S. A. Neruatoguathi, 133, 1890. 



Subgenus RHAMDELLA, Eigenmanu & Eigenmann. 



Besides the species ascertained by Dr. Eigenmann to belong to Rbamdia, 

 the following additional species have been described from within our 

 limits, but in none of these has the character of the fontanelle been given, 

 so that it is impossible to say whether they belong properly to Rhauidin 

 or to Rhamdella; most likely the majority of them will be found to have 

 their places in the latter group : 



234. RHAMDIA BARONIS-MULLERI, (Troschel). 



Head 5 in total length. D. I, 6; A. 12; P. I, 9. Head flat, forehead 

 broadly rounded; upper jaw the longer; maxillary barbels reaching tip 

 of ventrals; outer mandibulary barbels to beyond base of pectorals, 

 nearly twice as long as inner. Eye high, before middle of head; snout 

 nearly twice length of eye; interorbital space H times eye. Head covered 

 with soft, smooth skin, occipital process narrow, pointed, covered with 

 skin; humeral process reaching middle of pectoral spine. Body taper- 

 ing backward from head, much compressed behind. Pectorals reaching 

 to opposite third dorsal ray, the spine serrate within; ventrals shorter 

 than pectorals, falling far short of anal, reaching halfway to base of 

 third anal ray. Adipose fin 3 times in the whole length. Caudal deeply 

 divided, the lobes rounded, the lower larger. Brown, paler below, the 

 lateral line a narrow black streak. " Pacific Ocean" in Mexico. (Tros- 

 chel.) (Named for J. W. von Miiller, the title "Baron" distinguishing him 

 from the naturalist Johannes Miiller.) 



Pimelodm baronis-mulleri, TROSCHEL, in Miiller's Beitrage znr Geschichte, Statistik und Zoologie 

 von Mexico, in, 636, 1805 ; no definite locality. 



235. RHAMDIA MOTAGUENSIS, (Gunther). 



Head 5; depth 6. D. 1,6; A. 12. Occipital process short; adipose 

 fin 3Jin length; maxillary barbels to end of dorsal; dorsal spine very 

 feeble; pectoral spine striated; its inner margin strongly serrated. Cau- 

 dal peduncle as high as long; caudal forked; the lower lobe rounded ; 

 the upper pointed and longer. Brownish, dorsal with a white band. Rio 

 Motagua, Guatemala. (Gunther.) 



Pimelodus moiaguensis, GUNTHER, Cat., v, 127, 1864, Rio Motagua, Guatemala. 



236. RHAMDIA BRACHYPTERA, (Cope). 



Head 5f; depth 51, D. I, 6; A. 11; P. I, 9. Occipital process short; 

 maxillary barbels reaching beyond dorsal; lower jaw a little shorter; 

 dorsal longer than high, its spine very weak; pectoral spine striate, flexi- 

 ble at top, strongly serrate on inner margin; adipose fin 3* in body; caudal 

 deeply emarginate; its lobes largely rounded. Blackish, a pale shade on 



