EIGENMANN: THE PYGIDIID/E, A FAMILY OF SOUTH AMERICAN CATFISHES. 323 



In the specimen from Caldas, No. 13829, the origin of the dorsal is equidistant 



from the tip of the caudal and the opercular spines. The spots along the middle 



of the sides are conspicuous, but not confluent. 



To this species probably also belong the following specimens. 



7451a, C. M., 13839, I. U. M., 3, largest 60 mm. Quebrada de la Pclada, San- 

 tander. 



7452a, C. M., 13840, I. U. M., 2, larger 41 mm. Quebrada dc la Callegona, San- 

 tandcr. 



7453a-b, C. M., 13841, I. U. M., 3, largest Gl mm. Rio Mogotes, Santander. 



7454a-c, C. M., 13842, I. U. M., 0, largest 63 mm. Quebrada de Horizonte, San- 

 tander. 



7455a-d, C. M., 13843, I. U. M., 8, largest 67 mm. Quebrada de Suescum, San- 

 tander. 

 These are like the typical specimens of striatum described above, but lack all 



color markings, being uniformly pale. 



Very close to striatum if not identical with it, is P. regani. 



42. Pygidium regani Eigenmann. (Plate XLVIII, fig. 5.) 

 Pygidium regani Eigenmann, Proc. Am. Philos. Soc, LVI, Jan., 1918, p. 696. 

 ? Pygidium taenia Regan (non Kner & Steindachner), Ann. & Mag. Nat. Hist. 



(8), XII, 1913, p. 469 (Rio Sipi and Rio Tamana). 



Habited. — San Juan basin. 

 13772, I. U. M., one, 55 mm. Tado, Rio San Juan. Purchased from Rosenberg. 



Head 6; D. 10.5; A. 8.5; P. 8; eye in middle of the head, interorbital four 

 times in the length of the head. 



Nasal barbel as long as the head, reaching beyond axil of pectoral; maxillary 

 barbel reaching to near the end of the lower pectoral ray, considerably longer than 

 the head; outer pectoral ray as long as the head; origin of ventrals equidistant from 

 base of middle ray and tip of opercle, not quite reaching to the vent; origin of anal 

 under posterior half of dorsal, the distance from the base of the last ray to the 

 middle caudal ray contained five and one-half times in the length; caudal six times 

 in the length; origin of dorsal equidistant from tip of caudal and opercular spines, 

 over posterior third of the ventrals, its distance from the middle caudal ray one 

 and four-fifths in its distance from the snout. 



A dark streak from opercular spines to middle of caudal; faint spots above and 

 below the lateral stripe. 



