310 MEMOIRS OF THE CARNEGIE MUSEUM. 



Pectoral narrow, the outer ray about eciual to the head in length; origin of the 

 ventrals about equidistant from base of caudal and middle of pectorals, the tips 

 at or slightly beyond anus; origin of anal below middle or posterior part of the 

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

 five and one-third in the length; caudal distinctly rounded, about six and one-half 

 in the length; origin of dorsal over tip or middle of the ventrals, its distance from 

 the base of the middle caudal rays about two in its distance from the snout. 



Smallest specimens with a black lateral band, a series of spots above and below 



it in the older, the band breaking up into a series of spots in specimens over sixty 



millimeters long. The oldest specimens dark with obscure darker spots and mot- 



tlings. 



26. Pygidium taenium (Kner). 



Trichomycterus taenia Kner, 8b. Akad. Wiss. Mlinchen, 1863, p. 228; Kner & 

 Steindachner, Abhandl. k. Bayer. Akad. Wiss., II. ('!., vol. X, part I, 1864, 

 p. 52 (western slope of Andes of Ecuador); GtJNTHER, Cat. Fishes Brit. Mus., 

 V, 1864, p. 274. 



Pygidhcm toenia Eigenmann & Eigenmann, Proc. Cal. Acad. Sci. (2), II, 1889, 

 p. 51; Occasional Papers Cal. Acad. Sci., I, 1890, p. 334; Proc. U. S. Nat. 

 Mus., XIV, 1891, p. 36; Eigenmann, Reports Princeton Univ. Exped. Pata- 

 gonia, III, 1910, p. 399. 

 Habitat. — Western slope of the Andes of Ecuador and southern Colombia. 



13813 I. U. M., 7095a-d, C. M., forty-two, 31-111 mm. Los Llanos, southern 

 Colombia. March 8, 1913. Arthur Henn. 



Fi(i. 14. Pi/gidiniii tiviiiiiin. (Kuer). After Kner & Steiiiilacliuer. 



Head 5.2-5.6; D. 9.5 or 10.5; A. 8.5; P. 7; eye in the middle of the head, inter- 

 orbital three in the length of the head. 



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

 pectoral; outer pectoral ray witli its filament a little shorter than the head, the rays 

 about equal to the head without the snout; ventrals reaching the vent, their origin 

 equidistant between base of middle caudal rays and opercular spines; origin of 

 anal under anterior half of the dorsal, the distance between the base of its last ray 

 and the middle caudal rays about five in the length; caudal rounded, five and five- 



