ANNOTATED LIST OF THE SPECIES 377 
Dorsal profile rather strongly and uniformly convex to end of dorsal basis, 
and ventral profile to end of anal base; shoulder the widest part of the body, 1.4 
in the length of the head; depth greater than head length, containing it 1.25 times; 
depth in length 2.8-3.4. A specimen of miilleri of equal length has the head about 
0.8 as long, depth about 0.8 as great; in both the eye equals snout, and is contained 
2.0 in the interorbital space, but this equality is due to the actually smaller eye of 
miilleri, whose crown is considerably narrower. Eye 3.75-4.75 in the head, which 
slightly exceeds 3 in the short body length. Mouth broader, more oblique, gape 
flatter than in miller’, crown equally convex. 
Bony rather than scaled oeciput; few scales on infraorbital; cheek scaled far 
jn advance of eye; finely scaled or desquamated on pre-pectoral; little regularity 
of vertebral series; a broad band of the belly fully scaled, otherwise naked; fin 
bases well enclosed by scales. 
D. and A. 13-14; C. 23-25, not 31. 
Fins rather short and erect, long-rayed, dorsal and anal appearing to be 
notched into the contours of the body, with oblique bases, and directed backward. 
All but the smallest uniformly olivaceous above shading to yellowish below, 
and a silver-saffron on cheeks and opercles. A broad lateral band seen on some 
specimens freshly taken. 
The species strongly developed along the lines of miilleri forward, weaker 
caudally, a short-hitched modification of the former with more rounded contours 
generally. 
487. ORESTIAS JUSSIEI Valenciennes 
Plate X XI, fig. 3 
Orestias jussie? Cuvier and Valenciennes, 1846, Hist. Nat. Poiss., XVIII, 176, pl. 535; 
Castelnau, 1855, Anim. Amér. Sud, Poiss., 51, 52, pl. xxvu, fig. 3; 
Gunther, 1866, Cat. Fish. Brit. Mus., VI, 329; 
Eigenmann and EKigenmann, 1891, Proc. U.S. Nat. Mus., XIV, 65; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 461; 
Evermann and Radcliffe, 1917, Bull. U. S. Nat. Mus., no. 95, 42. 
Orestias jussieut Garman, 1895, Mem. Mus. Comp. Zool., XTX, 155. 
Rio Guasacona; Rio Chinchero, near Cuzco 
15066, 42, 30-85 mm., Lago Chinchero, Adele Eigenmann, December, 1918. 
A clear-cut and striking species of the smooth-scaled division of the genus, 
characterized by the shorter, deeper form, the vertical chin, great and uniform 
convexity above, and the more complete, closer investiture of scales on anterior 
parts. 
The author’s description is clearer than nearly any other, although his figure 
is Inaccurate In some respects. 
In its general configuration O. jussiei appears to be easily derived from miilleri 
which it resembles: in the specialized scales of the head and shoulder, except as to 
their extent; in the regularity of the scale rows on the latter half of the body; in 
the slender proportions of the caudal peduncle; in the narrow snout and mouth. 
