134 CALIFORNIA ACADEMY OF SCIENCES. 



DOUBTFUL SPECIES OF Pimelodella or of Fimelodus. 



I. Rhamdia cyanostigma Cope. II. Silurus quadrimacu- 

 latus Blocli. 



VIII. PiMELODUS Lac^pede. 

 Pseudxirioides & Pseudorhamdia Bleeker; Pseudorhamdia 

 Liitken. 



49. Pimelodus eques Miiller &Troschel. 



Localities: Amazon near Fonteboa; Teffe; Obidos; Villa Bella; Jose 

 Fernandez; Xingu; Tonantins; Hj'iitahy; Lake Hyanuary. 



50. Pimelodus ornatus Kner. 



Silurus mcgacephalus Natterer. 

 Locality: Goyaz. 



61. Pimelodus albicans (Cuv. & Val.) 



Arias albldus Val.; Arias rwiroti yi\\.fide Gunther. 

 Locality: Eio Plata. 



52. Pimelodus pictus Steindachner. 



Locality: Hyavary. 



53. Pimelodus clarias (Bioch.) 



Pimelodus 7nacalaius Lacepede; Pimelodus rigidus Spix; Pimelodus 

 blochii Cuv. & Val.; Pimelodus arekaima Schomburgk (plate, not 

 description); Mystus ascita Gronow; Pimelodus macronema'BXeeker; 

 Pseudariodes albicans Liitken; ? Pseudariodes panther imisliniken; 

 Pseudorhamdi i piscatrix Cope; Piramuiano, macrospila Giinther. 



Localities: I. var. (?) maculaius, Eio das Velhas; Uragnay; Jequit- 

 inhouha; Rio Grande; Goyaz. 



II. vars. (?) macrospila, arekaimi, piscatrix, and uov., Para; Porto do 

 Moz; Sautarem; Obidos; Villa Bella; Coary; Teffe; Fonts Boa; 

 Tabatinga; Hyavary; Cudajas; Eio Gongallo; Montalegre; Eio 

 Reto; Rio Puty; Manacapuru; Tonantins; Lago Alexo; Cameta. 



III. var. ( ?) uov., Rio San Francisco. 



IV. var. (?) uov., Avary; Para; Iga; San Gongallo; Jutahy; Rio 

 Puty. 



V. var. (?) macronema, Amazon. 



We have repeatedly examined and compared the 300 or more speci- 

 mens in the collection, and can come to no other conclusion than 

 that the many synonyms given here all refer to this extraordinarily 

 variable species. 



54. Pimelodus grosskopfii steindachner. 



