170 Evermann and RadcUffe — A Cyprinodont from Peru. 



and var. crequii. In some of these the hlack spots on sides have become 

 coalesced to such an extent tliat they form three parallel black bands «-itli 

 two alternating light bands between them; the central Ijlack band typical 

 of Pellegrin's var. ti/pica is wider and more jirononnced in color in these 

 specimens. Others liave dnsky or black sjjots below black lateral stripe. 



We have examined also two examples of this species collected in Lake 

 Titicaca near Puno, Jnly 28, 1908, ])y Dr. Robert E. Coker. They are not 

 so slender as our specimens and it is probable, as is indicated in the table 

 of comparative measurements, that the head and depth are more nearly 

 equal in living examples of this size. They have tlie general coloration 

 of our specimens over (i.O cms. long but the dorsal and caudal are punc- 

 tulate with darker. In the smaller one there is a dusky line bordered 

 on either side with white, passing through the center of the dorsal fin. 



After careful study of these specimens, in all of which the colors have 

 been well preserved, we feel confident that specimens of Orestias agasKizii 

 from this region will not admit of such a separation as that oflTered by 

 Pellegrin. That difl'erent conditions markedly affect their brilliancy of 

 coloration is evidenced by the specimens in our collection. The young 

 (under 6.0 cms. ) from shallow Lake Angascancha with still water and nuid 

 bottom are mucli darker than those of the same size taken from the clear, 

 narrow, deep and rapid streams around La Fundicion. The latter do not 

 show such marked ditt'erences and tend to conform much more closely to 

 the adult in color and general appearance. 



