234 CALIFORNIA ACADEMY OF SCIENCES. 



Twenty-three specimens .10-. 37 m. Teffe; Gurupa; 

 Obidos; Xingu Cascade; San Gongallo; Rio Preto; Rio 

 Puty. Thayer Expedition. 



169, Doras armatulus. 



Doras armatulus Cuv. & Val. Hist. Nat. Poiss. xv, 275, 1840 (Par- 

 ana); Kner, SB. Ak. Wien, xvii, 116, 1855 (Guapore and Para- 

 guay in the Province Matogrosso); Giinther, Cat. Fish. Brit. 

 Mus. v, 201, 1864 (copied); Peters, MB. Ak. Berlin, 470, 1877 

 (Calabozo); Steindachner, Fliissfische Siidam, iv, 5, 1883. (Kio 

 Huallaga; Xingu; Rio Puty; Rio Preto). 



Habitat: Upper courses of Brazilian Rivers; Venezuela. 



Dr. Steindachner considers this to be the young of 

 costatus. 



170, Doras hancockii, 



Doras costata Hancock " Zool. Journ. iv, 242 " (not of L.) 



Doras hancockii Cuv. & Val. Hist. Nat. Poiss. xv, 279, 1840 (copied); 



Giinther, Cat. Fish. Brit. Mus. v, 202, 1864 (River Cupai.) 

 Habitat: River Cupai. 



171, Doras brachiatus, 



Doras brachiatus Cope, Proc. Acad. Nat. Sci. Philad. 270, 1872 



(Maranon). 

 Habitat: Maranon. 



172, Doras calderonensis. 



Doras calderonensis Vaillant, Bull. Soc.Philom. Ser. 7, iv, 154, 1880 



(Calderon). 

 Doras (Rhinodoras) depressus Steindachner, Flussfische. Siidam. ii, 



1, pi. i, figs. 3-3a, 1881 (Lago Alexo). 

 Habitat: Lago Alexo; Calderon. 



The name calderonensis has several months priority 

 over depressus. This species seems to differ from D. 

 cataphractus chiefly in the nature of the serration of 

 the dorsal spine. 



173, Doras cataphractus, 



Silurus cataphractus Linnaeus, Syst. Nat. ed. x, 307, 1758, ed. xii, 

 506, 1766. 



Doras cataphractus Cuv. & Val. Hist. Nat. Poiss. xv, 276, 1840 (?) 

 Schomburgk, Fish. Guiana, part i, 158, 1841 (Rio Negro); Kner, 

 SB. Ak. Wien, xvii, 1855, Ichthyol. Beitr. 126 (Rio Guapore; 

 Barra do Rio Negro); Bleeker, Ichthyol. Arch. Ind. Siluri. 54, 

 1858; Giinther, Cat. Fish. Brit. Mus. v, 204, 1864 (?) 



