ANNOTATED LIST OF THE SPECIES 363 
479. ORESTIAS OLIVACEUS Garman 
Plate XVIII, fig. 3 
Orestias olivaceus Garman, 1895, Mem. Mus. Comp. Zool., XTX, 152; 
Kigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 461; 
Evermann and Radcliffe, 1917, Bull. U.S. Nat. Mus., no. 95, 42. 
Lake Umayo 
3946 MCZ, 1, 84 mm., cotype, Lake Umayo, E. G. Squier, 1865. 
My collections from this body of water contain no olivaceus, and Garman’s 
description is ambiguous on the separation of olivaceus from albus. I experienced 
much confusion as to the boundaries of the two until Dr. Barbour kindly placed 
the above specimen at my disposal, when I was pleased to find what a clear-cut 
species olivaceus is after all. Despite its 76 years in alcohol, it is well preserved. 
Of all the Orestias species this has the most horizontal dorsal profile, flattened 
on the crown, depressed slightly at the occiput, the predorsal gently convex, dorsal 
basis slightly elevated, peduncle a little concave; ventral profile greatly bent up- 
ward on the elevated chin and throat, leveling off on the belly, siightly concave from 
anus to base of caudal. General form short, moderately deep, depth equal to the 
length of the head, 3.0 in body length; compressed roundly, nowhere more than 
slightly angular; width at opercle 1.3 in length of head, the latter slightly broader 
than deep; head pointed and narrowly rounded at the chin. Mouth conspicuously 
superior, cleft to middle level of the eye; teeth small, a complete, clear-cut series 
in each jaw; eye rather small, elevated, equal to the short snout, 2.0 in the inter- 
orbital, 5.0 in the head. Caudal peduncle short, deep. 
Infraorbital area without scales; cheek and opercle fully scaled; pre-pectoral 
area well-scaled to much below the level of the base of the fin, belly only narrowly 
naked; no desquamated areas on the back or sides; vertebral series complete with 
13; body scales show growth-lines rather well, but roughened along these lines; 
granulations on scales of forward parts very moderate and rather scattered. Not 
as harsh to the touch as Garman’s description would be understood to imply. 
Doe Aca lOc ile 
Fins short like body dimensions, but dorsal tip nearly reaching caudal base; 
anal almost as long; caudal peduncle and fin short and deep, fin subtruncate; 
pectoral broad, short, but reaching more than half way to the anal. 
Color pale, yellowish-green; tinged with brown on the back, about fin-bases, 
snout, and thin lips. Few chromatophores anywhere, or at least few remain. 
480. OreEsTIAS ALBUS Valenciennes 
Plate XIX, figs. 2-5 
Orestias albus Valenciennes, L’Inst., 1839, VII, 118; 
Cuvier and Valenciennes, 1846, Hist. Nat. Poiss., X VIII, 180, pl. 537; 
Garman, 1895, Mem. Mus. Comp. Zool., XIX, 153; 
Pellegrin, 1904, Bull. Soe. Zool. France, X XIX, 94; 
Starks, 1906, Proc. U. S. Nat. Mus., XXX, 780; 
