126 PROCEEDINGS OF THE ACADEMY OF [April, 



Dorsal origin nearly midway between snout tip and hind anal ray 

 base, and flexible spine largest of rays, depressed fin short or but 

 slightly longer than predorsal space to head. Adipose fin ol^solete, 

 only evident as slight ridge along upper edge of caudal peduncle 

 behind anal base. Anal inserted slightly nearer caudal base than 

 ventral origin, median rays longest, or fin extends about half way 

 to caudal base. Caudal emarginate behind, uppermost and lower- 

 most simple rays longest, forming sharp points. Pectoral low, 

 outermost or simple enlarged ray much longest, reaching base of 

 uppermost ventral ray. Ventral inserted about opposite dorsal 

 origin, fin long and slender or 1 f to anal. Anal papilla long, slender, 

 conic, about f of anal spine. 



Color in alcohol dull brownish generally, with more or less clouded 

 or dull slaty marblings. Under surface of head, breast and belly 

 pale brownish-white, also lower surfaces of fins pale. Iris pale slaty. 

 Pectorals and ventrals with obscure shades of dusky on rays basally, 

 also same tints on dorsal and caudal rays. 



Length 95 mm. 



Type, No. 49,368, A. N. S. P. cT. Brook near the small village 

 of Choachi, 25 kilometers east of Bogota and at 1800 meters of alti- 

 tude, Colombia, 1917. Hermano Apolinar Maria. 



Also Nos. 49,369 to 49,384, A. N. S. P., paratypes, with same 

 data, of which seven are females. All show: Head 3f to 4|; depth 

 5^ to 7f ; D. I, 6; A. I, 6; head width 1 to 1| in its length; snout l|to 

 2; mouth width 2j to 3; interorbital 3 to 4f ; length 40 to 88 mm. 

 In the males the dorsal spines are damaged, opercle spiny, barbel 

 reaches pectoral origin, caudal much longer than head and no adipose 

 spine. The young show a dark caudal base. The females are 

 variable in depth, often with the adipose ridge of the back better 

 developed than in the male. They have the head about equally 

 papillose and spinescent, though are without the anal papilla. 



A male which was dissected had the remains of large dipterous 

 insect larva in its pharynx. 



This species appears allied with C. venirale Eigenmann' from 

 Dagua, which it represents in the headwater drainage of the Rio Meta 

 basin. C. ven-rale appears to differ in the presence of an adipose 

 spine, nasal barblet and in having the ventrals reaching slightly 

 beyond the vent. Other Colombian species, C. chapmani Eigen- 

 mann,^ C. trifasciatum Eigenmann* and C. unifasciaium Eigenmann^ 



1 Indiana Univ. Bull., X, No. 8, September, 1912, p. 15. 



^ L. c, p. 13. Boquia. 



' L. c, p. 14. Caldas and Cisnero. 



* L. c, p. 15. Caldas. 



