eigenmann: the pygidiid,e, a family of south American catfishes. 329 



./'./. With ill-defined spots; origin of ventrals equidistant from snout and tip 

 of caudal; caudal rounded; distance between origin of dorsal and 

 caudal twice in its distance from the snout; 1). 10; A. 7. 



59. goeldii (Boulenger). 



jjj. With small spots and vermiculations; origin of ventrals equidistant from 



snout and tip of caudal; distance between origin of dorsal and caudal 



1.66-1.75 in distance of dorsal from the snout; D. 10.5 or 11.5; A. 7.5 



or 8.5 (i(). brasiliense (Reinhardt). 



jjjj. A dark lateral band, spots above and below it; origin of ventrals a little 

 nearer snout than to tip of caudal; distance between origin of dorsal and 

 caudal 1.8 in distance of dorsal from the snout; caudal truncate. 



61. itatiayae (Ribeiro). 

 hh. Origin of the anal behind the vertical from the last dorsal ray, the dorsal opposite 

 the space between the ventral and anal, its origin equidistant from snout and 

 tip of caudal, or nearer one or the other; origin of ventrals nearer the snout than 

 to the tip of the caudal; interopercle with about seven spines in a bunch similar 

 to that of the opercle; a series of dots along the middle of the sides, another along 



the back and another between the two 62. triguttatum Eigenmann. 



ccc. Origin of dorsal equidistant from tips of snout and caudal; pectorals without filaments; dorsal 

 entirely in front of the anal. 

 k. Sides and back with minute dark specks and vermiculations between them; origin of dorsal 



over origin of ventrals 63. punctatissimum (Castelnau). 



kk. Pale brown above with three longitudinal series of squarish brown blotches; origin of dorsal 



over middle of ventrals; head 4.5 in the length 64. minutum (Boulenger). 



cccc. Origin of dorsal nearer snout than to tip of caudal. 



I. Nasal barbels not quite reaching eye, maxillary barbel little beyond posterior margin of the 

 eye; dorsal entirely in front of anal; sides with large blotches. Head four times in the 

 length; a long patch of interopercular spines; pectoral ray not prolonged. 



65. santae-ritae Eigenmann. 

 //. Nasal barbels reaching beyond origin of eye; pectoral ray prolonged. 



. m. Interopercle with a long patch of spines; pectoral ray prolonged. (See P. alternatum, 



No. 56.) 

 mm. Interopercle with about seven thorns in a patch similar to that of the opercle; end of 

 dorsal over anus; pectoral ray much prolonged. (See P. triguttatum, No. 60.) 



49. Pygidium nigricans (Cuvier & Valenciennes.) 

 Trichomycterus nigricans Cuvier & Valenciennes, Hist. Nat. Poiss., XVIII, 

 1846, p. 494; ? Gay, Hist, Chile, 1848, p. 311 (Chile); GUnther, Cat. Fishes 

 Brit. Mus., V, 1864, p. 274 (copied); Ribeiro, Fauna Braziliense, Peixes, 

 IV (A), 1912, p. 220. 

 Pygidium nigricans Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), II, 1889, 

 p. 53; Occasional Papers Cal. Acad. Sci., I, 1890, p. 338; Proc. U. S. Nat, Mus., 

 XIV, 1891, p. 37; Eigenmann, Reports Princeton Univ. Exped. Patagonia, 

 III, 1910, p. 400. 



