EIGENMANN: THE PYGIDIID^E, A FAMILY OF SOUTH AMERICAN CATFISHES. 357 



developed into fins like those of a larval frog; everywhere except on the belly spotted. 

 Twenty-one vertebrae behind the anal. 

 The type was caught among water- weeds (Eichornea azurea). 



2. Ochmacanthus reinhardti (Steindachner). (Plate LV, fig. 4.) 

 Stegophilus reinhardti Steindachner, Flussf. Sudani., IV, 1882, p. 28, pi. VI, fig. 1 



(Lake Manacapuru; Rio Iga; Montalegre; Te^e; Tabatinga); Eigenmann & 



Eigenmann, Proc. Cal. Acad. Sci. (2), II, 1889, p. 55; Occasional Papers Cal. 



Acad. Sci., 1, 1890, p. 344;Proc. U. S. Nat, Mus., XIV, 1891, p. 37; Eigenmann, 



Reports Princeton Univ. Expcd. Patagonia, III, 1910, p. 401; Ribeiro, Fauna 



Bras., IV (A), 1912, p. 401. 



Habitat. — Amazons. 

 7552, G. M., 38 mm. Amazon, at upper end of island four miles above Santarem. 



Dec. 9, 1909. Haseman. 

 7555a-b, C. M., 35-46 mm. Igarape de Jaura, entering R. Tapajos two miles 



above Santarem. Dec. 11, 1909. Haseman. 



Head 7; D. 11-13 (9 or 10 developed rays); A. 10-11 (8 or 9); P. 6, partly 

 adnate; eye equals snout, less than interorbital, entirely in the anterior half of the 

 head, 4-5 in the head; maxillary barbel reaching interopercular spines, the lower 

 barbel a third or fourth as long; 8 or 9 interopercular spines, 9 to 12 opercular; 

 width of head equal to its length. Three series of teeth in the upper jaw, those of 

 the inner series close set, much more numerous than those of the outer series, the 

 teeth of the outer two series at the middle of the mouth a little longer and more 

 slender than the rest; lower jaw with two complete series of teeth, the inner series 

 similar to inner series of the upper jaw, those of the outer series larger, fewer, and 

 much more movable than those of the inner, about fifteen in the outer series, about 

 forty in the inner; four increasingly shorter series from the inner series outward 

 near the middle of the jaw. 



A prominent pectoral pore, pectoral equal to the head or to the head without 

 the snout. Origin of ventrals equidistant from bases of caudal and pectoral or a 

 little farther forward, distance between last anal ray and caudal 4-4.5 in the length; 

 distance between origin of dorsal and base of caudal 1.75-2 in its distance from the 

 snout; caudal rounded, with many prominent accessory rays. 



Back gray, sides and fins mottled. 



3. Ochmacanthus flabelliferus Eigenmann. (Plate LV, fig. 5.) 

 Ochmacanthus fiabcllifcrus Eigenmann, Mem. Carnegie Mus., V, 1912, p. 213. 



Habitat. — Essequibo 1 >asin. 



