342 MEMOIRS OF THE CARNEGIE MUSEUM. 



1891, p. 37; Eigenmann, Reports Princeton Univ. Exped. Patagonia, III, 



1910, p. 400; Indiana University Studies, No. 23, Sept., 1914, p. 230. 

 Trachypoma marmoratum Giebel, /. c. 



Habitat. — Plain of Bogota and north of it for a short distance. 

 5046a-p, C. M.; 12840, I. U. M., many, largest 325 mm. Ponta de Suba, north of 



Chapinero. Eigenmann. 

 5049, C. M., two, largest 300 mm. Laguna near Bogota (bought in the market). 



Eigenmann. 

 5048a-A-, C. M.; 12841, I. U. M., twenty-two, largest 210. Herrera. Eigenmann. 

 5047o-/t, C. M.; 12842, I. U. M., sixteen, largest 270 mm. Madrid. Eigenmann. 

 7445o, C. M.; 13834, I. U. M., two, 142 and 165 mm. Rio Chiquinquiere, Boyaca. 



Gonzales. 

 7446a, C. M., one, 220 mm. Rio Bogota. Gonzales. 

 13836, I. U. M., three, 130-160 mm. Rio Funjuelo at Usme Sur near Bogota. 



Head 5.33-6; depth 5-6.33; D. 11.5; A. 9.5; P. 8; head pointed, a little longer 

 than wide ; center of the eye very little in advance of the center of the head ; inter- 

 ocular three times, or a little more, in the head; teeth conical, in three to five rows; 

 gill-openings not extending forward to below the eye; a very narrow free mem- 

 brane across the isthmus. 



Nasal barbel extending to the base of the opercular spines or shorter; maxillary 

 barbel extending very little if any further than the nasal barbels; pectoral 1.5-2 

 in the head, its first ray sometimes very slightly produced, origin of anal about 

 under the middle of the dorsal, the distance between the last ray and the middle 

 caudal rays 4.5-5.5 in the length; depth of caudal peduncle 1.25-1.5 in its length, 

 .66-8 in the greater depth; caudal very broad and short, its length seven or more 

 in the length; origin of dorsal nearly equidistant from tip of caudal and the head, 

 its distance from the base of the middle caudal rays 1 .8-2 in its distance from the 

 snout. 



Blackish, everywhere with well-defined but irregular spots or vermiculations. 

 The black background most abundant above, the light vermiculations predominant 

 below. In some specimens the dark predominates everywhere, the light being 

 reduced to spots, or vermiculations, in others the light predominates; in the young 

 there is a narrow dark median stripe, and the dark of the caudal peduncle consists 

 of a few irregular spots, on the back in front of the dorsal the typical color of the 

 adult obtains. Very variable. 



The specimens from the Rio Funjuelo deserve special mention. 



The largest measures a few millimeters over 160; it is not possible to give 



