62 CALIFORNIA ACADEMY OF SCIENCES. 



Origin of ventrals about equidistant from tip of caudal 

 and tip of snout. 



Dark chocolate brown; sides, back and unpaired fins with 

 irregular groups of dark points. 



Head 5|-6; depth 5J-7; D 12; A. 10. 



12. Pygidium punctatissimum Casteluau. 



13. Pygidium knerii Steindachner. 



Localit}': Cumbaca. 



14. Pygidium dispar Tsclmdi. 



Locality: Callao, Peru. 



14a. Pygidium dispar punctulatum Cuv. & Vai. 



Locality: Rio Remac near Lima. 



15. Pygidium pardum Cope. 



16. Pygidium nigromaculatum Bouleuger. 



17. Pygidium immaculatum sp. uov. 



Types, No. 8300; 10 specimens .12-, 20 m. Juiz de Fora, Rio Parahy- 

 buna. Hallfeld. 

 8302; 1 specimen .15 m. Sao Matheos; Hartt & Copeland. 

 8307; 1 specimen .14 m. Juiz de Fora, Rio Parabyba. 

 8305; 1 specimen .14 m. Juiz de Fora, Rio Parabyba. 

 8266; 1 specimen .06 m. Goyaz. S^nbor Honorio. 



Elongate, compressed backward; head greatly depressed, 

 the snout broad spatulate; width of head less than its 

 length. Eye comparatively large, equidistant from tip of 

 snout and tip of opercle. Barbels all rather short, the 

 nasals scarcely reaching occiput, mostly shorter; maxillaries 

 not to gill-opening. First pectoral ray prolonged in a fila- 

 ment. Dorsal truncate, its last ray in front of the anal, its 

 origin equidistant from nares and tip of caudal or slightly 

 nearer tip of caudal. Caudal broad, emarginate, the upper 

 lobe sometimes produced. 



Brownish, lighter below; fins somewhat dusky; speci- 

 mens from Sao Matheos uniform blackish-brown. 



Head 5i-5i (6-6^ in total). D. 11; A. 9. 



18. Pygidium taCZanOWSkii (Steindacbuer). 



