150 CALIFORNIA ACADEMY OF SCIENCES. 



108. Fimelodella cristatus. 



?Pimelodus insignis Schomburgk, Fish. Brit. Guiana, 180 (?/.o< plate). 



Pimelodus cristatus Miiller & Troschel, Schomburgk, British Gui- 

 ana, 628, 1848 (Takutu and Mahu Eivers); Miiller & Troschel, 

 Horse Ichthyol. iii, 4, 1849 (Guiana in Essequibo); Giinther, 

 Cat. Fish. Brit. Mus. v. 117, 1864 (Guiana; Essequibo; Kiver 

 Capin, Para); Vaillant, Bull. Soc. Philom. Series 7, iv, 152, 

 1880 (Calderon); Steindacher, Flussfische Siidamerikas, iv, 4, 

 1882 (Kio Huallaga). 



Fimelodella cristatus Eigenm & Eigenm, Proc. Cal. Acad., 2d. Ser. 

 i, 132, 1888 (San Gongallo; Avary; Villa Bella; Jutahy; Tapajos; 

 Eio Mucuri; Tabatinga; Hyavary; Coary). 



Pimelodus agassizii Steiudachner, SB. Ak. Wien, Ixxiv, July, 1876, 

 Ichthyol. Beitr. v, 99 (Peruvian Amazon; Hyavary) 



Pimelodus ophthalmicus Co^pe, Proc. Am. Philos. Soc. xvii, 675, 1878 

 (Upper Amazon). 



Habitat: Rivers emptying into the Atlantic north of Cape San 

 Koque; whole course of the Amazon. 



The Pimelodus ci'istatus M. & Tr. diudi Pimelodus insig- 

 nis Sch. are evidently identical. 



The description of insignis does not agree with the 

 plate which represents Gallophysus lateralis Q'lW^^macrop- 

 terus Lichtenstein. 



Schomburgk, 1. c, says that " The Wapisiana Indians 

 call this fish ' Konnairu,' it grows to about the length of 

 eighteen inches." 



Miiller & Troschel quoting Schomburgk's notes say the 

 " Wapisianas call it ' Komairu; ' it reaches a length of 

 16-18 inches. " 



The statement that insignis has 10 ventral rays may 

 be true, in which case it is of course distinct from crista- 

 tus; but such statements, never verified by any ichthy- 

 ologist, are to be distrusted. 



Pimelodus agassizii does not differ from cristatus. 



The characters assigned to P. ophthcdr^iicus are also 

 present in one or another of the specimens examined. 

 We have found the anal rays to vary from 12-15, and 

 the dorsal in some is very much higher than in others. 



The specimens in the museum are from San Gongallo; 



