Evermann and Raddiffc — A Cyprlnodont from Peru. 167 



Those little fish were plentiful and could be caught by hand. 

 They are rather lively swimmers antl get their food anywhere 

 but from the bottom. 



From Lake Angascancha we have 101 specimens, 2.0 to 10.1 

 cms. long. 



Lake Angascancha is a shallow lake aliout 3 miles northeast 

 of La Fundicion and at 14,200 feet elevation. The bottom is of 

 soft mud throughout and with plenty of water plants. The 

 fish were very plentiful and easily caught by hand in the weeds. 

 They feed on insects and vegetation. Their breeding season 

 appears to be in mid- winter. 



Orestias agassizii A'ulciu-ieiiiies. 



This species was first described by Valenciennes in Cnvier & Valen- 

 ciennes, Hist. Nat. Poiss., XVIII, 178 (275), 1846. 0. tschudii Castel- 

 nau, in Exped. Anim. Amer. 8nd, 51, pi. 27, fig'. 1, 1855; 0. owenii (in 

 part) Giintlier, Cat., VI, 330; 0. ortonii Cope and 0. frontosus Cope, in 

 Jonrn. I'liila. Ac. Sci., 2d series, VIII, 186, 1875, as stated by Garman, 

 are pr()l)ably synnnymons names for this species. Prof. Gannan in his 

 Fishes and Reptiles of Lake Titicaca in Bull. Mns. Coinp. Zool., Ill, 1-16, 

 pp. 273-6, 1871-6 (1876), adds some additional notes and iu "The Cypri- 

 nodonts" in Mem. Mus. Comp. Zool., XIX, No. 1, 1895, describes the 

 species more in detail. Pellegrin in Notes on the Fishes of Lakes Titicaca 

 and Poopo, in Soc. Zool. France, XXIX, 90-6, 1904, attempts to snbdivide 

 the species into four varieties based on their coloration and reinstates 0. 

 tsdiudii indicating that the latter has more dorsal and anal rays, more 

 scales in lateral line and a difference in the size of the eggs. The speci- 

 mens of 0. tscJiudii upon which he l)ases this distinction are larger than 

 the specimens of 0. agassizii with which he compares them. In his 

 " Les Poissons des Lacs des Hants Plateaux de I'Amerique du Sud," pi. 

 XI\', figs. A-I), 1907, he figures the four varieties of 0. agansizii. 8tarks 

 in a paper entitled " On a collection of Fishes made by P. O. Simons in 

 Ecuador and Peru," in Proc. U. S. Nat. Mus., XXX, 780, 1906, calls atten- 

 tion to the varialjility of scaling on the area in front of pectoral and the 

 fact that in his specimen the head was longer than stated by Garman. 



For purposes of comparison we give comparative measurements of a 

 series of 10 specimens from Lake Angascancha, 5 from La Fundicion, 2 

 from Lake Titicaca (collected by Dr. R. E. Coker) and one specimen from 

 Bolivia (U. S. Nat. Mus. No. 53,516). 



