Jordan and Evennann. — Fislies of North Avicrica. 151 



Pimelodns wmjiteri, GC'NTHEa, Fishes Cent. Am., 474, 18G9, Atlantic and Pacific rivers of 



Panama. 

 liliKmdiiibiaiisfonli, GiLL, Proe. Ac. Nat. Sci. Pliila., 187G, 337, Panama. 

 Ilhamdia wagiieri, Eioenmann, S. A. Nematognathi, 133, 1890. 



Subgenus RHAMDELLA, Eigeiiinann Sc Eigenmann. 



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

 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 lihamdia 

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

 their places in the latter group: 



234. RHAMDIA BABONIS-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 \\ 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 seriate 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.) 



Pimelodus harnnis-miilkri, Troschel, in Miillor's Beitriige zur Geschiclite, Statistik und Zoiilogie 

 von Me-xico, in, G36, 1805; no definite locality. 



23.5. RHAMDIA MOTAGUENSIS, (Giinther). 



Head 51; depth 6J. D. 1,6; A. 12. Occipital process short; adipose 

 fin 3 J in 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. Kio 

 Motagua, Guatemala. (Giinther.) 



Pimelodus motaguensis, GCntheu, Cat., v, 127, lSr,4, Rio Motagua, Guatemala. 



2.36. RHAMDIA BRACHTPTERA, (Cope). 



Head 5f; depth 5^. D. I, 6; A. 11 ; P. 1,9. 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 'S'i in body; caudal 

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



