126 CALIFORNIA ACADEMY OF SCIENCLJS. 



A large, dark humeral spot; fins dusky, the usual pale 

 bar on the dorsal fin near its base. 



Head 3|; depth, below dorsal spine, 5, above first anal 

 ray 4^; depth of caudal peduncle 8; Br. 7; D. I, 6; A. 10. 



17. Rhamdia sebse (Cuv. & Val.) 



Pimelodus stegelichii <fc musculus Miiller & Troschel; Pimelodus holo- 



melas <fc mulleri Giiuther. 

 Localities: Touantins; Gurupa; Eio Janeiro; Bahia; Xingu; Santa 



Cruz; Cudajas; Sao Matheos; Eio Doce; Serpa; Tabatinga; Goyaz; 



Para; Teffe; Surinam; Villa Bella. 



17. (a.) Rhamdia sebse kneri (Steindachner.) 



? ? Pimelonotus vilsbni Gill. 

 Localities: Tabatinga; Jutahy. 



18. Rhamdia foina (Muller & Troschel.) 



19. Rhamdia humilis (Giinther.) 



20. Rhamdia cinerascens (Giinther.) 



21. Rhamdia pentlandi (Cuv. & Val.) 



22. Rhamdia quelen (Q"oy & Gaimaid.) 



Pimelodus sellonis Muller & Troschel ; ? Pimelodus hahianus Castelnau; 



Silurus sapipoca Natterer; Pimelodus wuchereri Gunther; Pimelodus 



queleni cuprea Steindachner; Pimelodus cuyabce Steiudachner. 

 Localities : Santa Clara; Kio Mucuri; Juiz de Fora; Campos; Rio 



Jequitinhonha; Mendez; Eio de Janeiro; Macacos; Sao Matheos; 



Rio Parahyba; Caunavierias; Eio Grande do Sul. 



23. Rhamdia multiradiatus (Kner.) 



Pimelodus arekaima Schomburgk descr. not plate. 



24. Rhamdia sapo (Valenciennes.) 



Locality: Eio Grande do Sul. Emperor's collection. 



25- Rhamdia hilarii (Cuv. & Val.) 



Locality : Bon Jardiu, on the Rio San Francisco. 



26. Rhamdia wagneri (Giinther.) 



Pimelodus cinerascens Kner & Steindachner (not Giinther); Rhamdia 



bransfordii Gill. 

 Localities: Gorgona ; Eio Chagres ; Eio Obispo; Turbo, Atlantic 



Coast of Central America. 



27. Rhamdia longicauda Boulenger. 



28. Rhamdia dorsalis Gill, 



