234 CALIFORNIA ACADEMY OF SCIENCES. 



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

 Obidos; Xingu Cascade; San Goncallo; Rio Preto; Rio 

 Puty. Thayer Expedition. 



169. Doras armatulus. 



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

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

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

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

 (Calabozo); Steindachner, Fltissfische Siidam, iv, 5, 188.3. (Kio 

 Huallaga; Xiugn; Kio Pnty; Eio Preto). 



Habitat: Ui:)per 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 (Eiver Cupai.) 

 Habitat: Eiver Cupai. 



171. Doras brachiatus. 



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



(Marailon). 

 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 Linnseus, 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 (Eio Negro); Kner, 

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

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

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



