EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 349 



of head with similar spots, one marking the interopercular, another the opercular 

 spines; a few median, dusky spots behind the dorsal; sixteen sharply defined, dusky 

 blotches along the lateral line increasing in size to the caudal peduncle. Fins all 

 pale or whitish, several obscure spots of dusky on dorsal, caudal, and base of pec- 

 toral. 



4. Henonemus intermedius (Eigenmann & Eigenmann). 



Stegophilus intermedius Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), II, 



1889, p. 54; Occasional Papers Cal. Acad. Sci., I, 1890, p. 343; Proc. U. S. Nat. 



Mus., XIV, 1891, p. 37. 

 Henonemus intermedius Eigenmann, Reports Princeton Univ. Exped. Patagonia, 



III, 1910, p. 401 ; Ribeiro, Fauna Bras., IV {A), 1912, p. 230. 



Habitat. — Headwaters of the Rio Araguay. 



This species, found in a region intermediate between the localities where 

 punctatus and maculatus are found, combines in a remarkable way the characters 

 of those species. 



Type, No. 9842, M. C. Z., one specimen, 80 mm. Goyaz. Senhor Honorio. 



Head 5.5; D. 9; A. 7; eye equals snout, 3.5 in the head; mouth large, upper Up 

 with two series of teeth, premaxiUary and mandible with four series of depressible 

 teeth, those of the inner series enlarged at the tip; barbel shorter than eye; head a 

 little longer than wide; opercle with two spines, interopercle with five or six claw- 

 like spines 



Elongate, compressed behind, depressed forward; head somewhat longer than 

 wide, snout pointed; eye large, once in the snout, three and one-half times in the 

 head. Mouth large. Lower lip not dilated. Origin of dorsal about equidistant 

 from tip of caudal and occiput; caudal emarginate; anal placed entirely behind the 

 dorsal; origin of ventrals equidistant from bases of caudal and pectoral. Light 

 brown; entire upper surface with rather large dark brown spots; a series of larger 

 dark spots along the middle line of the sides, the spots becoming larger towards 

 the tail; caudal with a few, faint, dark spots. 



Genus VIII. Pseudostegophilus^^ Eigenmann & Eigenmann. 

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



p. 54. 

 Type. — Stegophilus nemurus Giinther. 



This genus has the characters of Homodimtus but has a deeply forked caudal. 



'' tpaiBrii = false; Stegophilus, the name of a related geiuis, see p. 3.53, from (rriyo^, t6 = a roof, and 

 4>iXos, 6 = a lover. 



