370 FISHES OF WESTERN SOUTH AMERICA 
Colors as mentioned above, most readily confused with O. agassizii var. 
inornata, such as those of Maravillas, but readily distinguished when brought 
together. 
Garman’s description of O. agassizvi collected at Puno applies to larger speci- 
mens than the types of Valenciennes, and was intended to supplement the original 
description. This it does very satisfactorily as applied to my larger specimens. 
His description and that of Evermann and Radcliffe, the latter taken from small 
specimens in central Peru, and large specimens from southern Peru, fail to take 
into account larger specimens from central Peru, such as the present species. 
The name empyraeus is in allusion to the extremely elevated habitat, mostly 
10000-14000 feet, the species being at its best in Lake Chinchaycocha, elevation 
13500 feet. 
483. ORESTIAS ELEGANS Garman 
Plate XX, fig. 1 
Orestias elegans Garman, 1895, Mem. Mus. Comp. Zool., XTX, 149; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, III, 461; 
Evermann and Radeliffe, 1917, Bull. U. S. Nat. Mus., no. 95, 40; 
Kigenmann, 1922, Mem. Carnegie Mus., [X, 184. 
Central Peruvian Andes 
15242, 46, 37-102 mm., small glacial lake, 15000-15500 feet elevation, near Casapalea, Peru, Eigen- 
mann, September, 1918. 
The only known Orestias of the Pacific slope; small lakes at the headwaters of 
the Rio Santa Eulalia, a small precipitous river arising just west of the continental 
divide near Casapalea; flowing into the Rimac above 3000 feet elevation and above 
the flume of the Chosica hydroelectric plant. Although populated at the sources, 
I found no fish life in the lower courses of the stream, near Chosica. 
D. 15; A. 16; P. 16-18; Ll. 34-36. 
Elongate, minnow form, ventral contour nearly straight, dorsal uniformly and 
moderately arched; head rounded above; eye usually circular equal to snout, more 
than 4 in the length of the head; H. 4.3 in length without caudal; greatest depth 
equals or exceeds length of head, and 3.75-4.3 in the length to the caudal. 
Mouth small, nearly vertical, the cleft reaching below the level of the eye, its 
width 1.4 in the interorbital space; teeth small, hooked, in a complete single series. 
P. short, not attaining to the midpoint from its origin to that of the anal; 
‘audal only about the length of the head. 
In form like an elongate O. agassizii, with the shoulder scalation more like 
that of O. miilleri, but without the widening of the body at that point; all other 
scales discernible small, weak, thin, mostly smooth; scales of cheek extending 
forward of the eye; few or none found in infraorbital region, which is encircled by a 
row of pores. 
Specimens badly preserved, fins badly broken, all nearly devoid of scales, 
emaciated. Naked skin pale yellow, with red chromatophores on dorsal areas. 
