SOUTH AMERICAN NEMATOGNATHI, 241 



and posterior nostrils; sides of head spotted with dark 

 brown, a bar of that color running immediately below 

 the margin of the buckler of the head continued forward 

 in front of the eye to base of mdxillary barbels. All 

 the barbels annulated with dark and light brown. Ven- 

 tral surface nearly white, dotted with brown. Fins 

 spotted or lengthwise striped with brown. 



Head3|-3A; depth 4i-5; D. I, 6; A. 13; V. 7; P. I, 7. 



Twenty-eight specimens .065-.22 m. Fonteboa; Tefle; 

 Serpa ; Porto do Moz ; Silva, Lake Saraca. Agassiz; 

 Thayer; Senhor Vinhas. 



178. Doras erocodili. 



Dorax crocodiU Humboldt, Observ. Zool. ii, 184, pi. 48, fig. 2 (Eio 

 Magdalena); Cuv. & Val. Hist. Nat. Poiss. xv, 287, 1840. 



Centrochir crocodiU Agassiz, Gen. et Spec. Pise. Bras. 14, 1829; 

 Bleeker, Nederl. Tijdschr. Dierkunde, i, 14, 1863 (name only). 



Habitat: Eio Magdalena. 



This species is known only from Humboldt's account 

 and figure. It is most likely identical with Doras longi- 

 pinis St., the only authoritatively known species of the 

 Rio Magdalena. 



179. Doras castaneo-ventris. 



Doras castaneo-ventris Schomburgk, Fish. Brit. Guiana, part i, 161, 



pi. iii, 1841 (Rio Pasawiri). 

 Habitat: Rio Pasawiri. 



This species is known only from the description and 

 fantastic figure by Schomburgk. 



180. Doras pectinifrons. 



Doras pectinifrons Cope, Proc. Am. Philos. Soc. xi, 568, 1870 

 (Pebas, Ecuador); id. Proc. Acad. Nat. Sci. Phila. 1872, pi. 3. 



Agamyxis pectinifro7is Cope, Proc. Am. Philos. Soc. xvii, 679, 1878 

 (nov. gen.) 



Habitat: Eastern Ecuador. 



181. Doras asterifrons. 



Doras asterifrons Heckel, MS. in Kuer, SB. Ak. Wien, xvii, 1855. 

 Ichthyol. Beitr. 123, plate ii, fig. 2 (Barra do Rio Negro, Rio 

 Guapore); Giinther, Cat. Fish. Brit. Mus. v, 203, 1864, (River 

 Cupai); Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 16.3, 1888 

 (Jutahy; Teflfe; Porto do Moz; Serpa). 



16 



