EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 319 



Nasal barbels reaching to the tips of the opercular spines, maxillary barbel to 

 near the middle of the pectoral; upper pectoral ray prolonged in a filament, as 

 long as the head or a little longer; ventrals reaching thc^ vent, their origin about 

 equidistant from snout and tii)s of middle caudal rays; origin of the anal under the 

 middle of the dorsal, the distance between the last ray and the middle caudal rays 

 4.5-5 in the length; caudal distinctly emarginate, about five in the length; origin 

 of dorsal a little nearer tip of caudal than eye, the distance between the origin of 

 the dorsal and the caudal 1.4-1.66 in its distance from the snout. 



Sjiecimens 18 mm. long have a black line from the nasal barbel to near the tip 

 of the middle caudal rays, accented in places; in specimens 20 mm. long the line is 

 accented more strongly, appearing to be breaking up into spots; there are also 

 spots on the back; in older specimens the line becomes diffuse; with growth a dis- 

 tinct series of spots develops along the middle of the back in front of the dorsal, 

 and another series between these and the lateral series; in the largest the sides and 

 back are profusely spotted, the spots varying in size and arrangement. 



In the specimens from Guaduas the barbels are a little shorter and the dorsal a 

 trifle farther forward. The color markings are less profuse than in the type. 



37. Pygidium spilosoma Regan. (Plate XLVIII, fig. 2.) 

 Pygidium spilosoma Regan, Ann. & Mag. Nat. Hist. (8), XII, Nov., 1913, p. 468. 



(Rio Sipi and Rio Tamana.) 



This species from the Pacific drainage of central Colombia is known from three 

 specimensT 30-250 mm. long, described by Regan, and 7092, C. M., 97 mm. Cor- 

 dova on the Rio Dagua. Eigcnmann. 



In the following description, Regan's data are given in brackets. 



Head 6 [to 6.75]; depth 7 [to 8]; D. 11.5 [9, with 6 branched rays]; A. 9.5 [7, 

 with 4 branched rays] ; P. 8 ; eye very little in front of the middle of the head ; interocu- 

 lar 3.5 in the length of the head [2.5-3]; head longer than wide, tapering forward, the 

 space between the nasal barbels 6.5 in the length of the head. Teeth minute, conical. 



Nasal barbels extending to the base of the opercular spines, the maxillary barbel 

 to their tip [to basal part of pectoral] ; pectoral rather narrow, the upper part trun- 

 cate, the filament eciual to the head; origin of the ventrals equidistant from base of 

 middle caudal rays and the tip of the opercular spines, a little too far forward in the 

 figure, origin of the anal under the middle of the dorsal [a little behind end of dorsal], 

 the distance between the base of its last ray and the base of the middle caudal rays 

 5 in the length; caudal truncate, six and one-fourth in the length; dorsal obliquely 

 truncate, origin of dorsal over posterior half of the ventrals, its distance from the 

 base of the middle caudal rays 1 .6 in its distance from the snout. 



