EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 335 



Head 4.75-5; D. 11.5-13; A. 9.5-10.5; P. 8 or 9; eye in the middle of the head 

 or very nearly so, interocular 4-4.5 in the head. Teeth conic. 



Nasal barbels extending to the middle of the interopercle, maxillary barbel 

 about to opercular spines; pectorals but little longer than snout and eye, the first 

 ray with its filament equal to head behind the nasal barbel ; ventrals reaching vent, 

 their origin very little nearer caudal than to eye; origin of anal just behind the 

 vertical from the base of the last dorsal ray or under the penultimate ray, distance 

 between the base of its last ray and the base of the middle caudal ray four and a 

 half to five times in the length; caudal very slightly emarginate, about seven times 

 in the length; origin of dorsal over posterior part of the ventral, its distance from 

 the base of the middle caudal rays one and two-thirds tinies in its distance from the 

 snout. 



Sides and back uniform, without trace of spots or vermiculations ; middle caudal 

 rays dusky. 



57. Pygidium vermiculatum Eigenmann. (Plate LII, fig. 2.) 

 Pygidimn vermiculatum Eigenmann, Proc. Am. Philos. Soc, LVI, Jan., 1918, 



p. 699. 

 Pygidium brasiliense {non Liitken) Ribeiro (partim), Fauna Brasiliense, IV (A), 



1912, p. 225 (the specimens from Juiz de Fora). 



Habitat. — Rio Parahyba. 

 7074, C. M., one, 131 mm. Juiz de Fora. June 9, 1908, presented by Dr. Ribeiro. 



In general appearance like Liitken 's figure of hrasiliense, differing notably in 

 the position of the ventrals. 



Head 5.4 in the length; D. 8.5; A. 8.5 (counting in each case the two rudi- 

 mentary rays) ; P. 7 ; width of the head nearly equal to its length ; eye in middle of 

 the head, interorbital three in the length of the head. Teeth conic, in bands. 



Right nasal barbels reaching to above base of the opercular spines, maxillary 

 barbels of right side nearly as long as head, reaching to the second fourth of the 

 pectoral, both shorter on left side ; pectoral rather narrow, the outer ray much pro- 

 longed, as long as the head behind the nasal barbel, the fin without the filament 

 equal to the part of the head behind a point midway between eye and posterior 

 nares; origin of ventrals under origin of dorsal, equidistant between base of middle 

 caudal rays and last third of pectorals, ventrals reaching much beyond vent, 

 almost to anal, as long as the snout; origin of anal under penultimate ray of the 

 dorsal, distance between the base of its last ray and the base of the middle caudal 

 ray a little more than five in the length; caudal rounded, six and one-third in the 

 length; dorsal short, rounded, the distance between its origin and the base of the 



