166 Evermann and Raddiffe — A Cyprinodoni from Peru. 



siderable stream, tlie Huaracaca, itself finally uniting with the 

 Montaro, which is the outlet of Lake Junin. The Montaro, 

 through other streams, becomes part of the Ucayali, one of the 

 larger tributaries of the Amazon. The initial rivulets first 

 named, may thus be considered as the very headwaters of tlie 

 Amazon from this district: and from these sources, which may 

 be called La Fundicion, come the fish in the parcel so marked. 



"About three miles to the northeast is the shallow lake 

 'Angascancha,' elevation 14,200 feet, from which Avere taken 

 the larger sort of fish as well as the smaller variety resembling 

 those from La Fundicion. The natural outlet of Lake Angas- 

 cancha once discharged into the Huaracaca a short distance 

 below the junction with tbe latter of the waters from La Fun- 

 dicion, l>ut with the establishment a few years since of tbe 

 smelting plant of the Cerro de Pasco Mining Co., the water 

 from Angascancha is now siphoned over a low ridge to a reser- 

 voir for the use of the smelter. Fishes from Angascancha may 

 now be found in the supply ditch and in the reservoir. Although 

 fish from La Fundicion and the smaller variety from Lake 

 Angascancha are evidently of the same species, none of the 

 larger sort is to be found in La Fundicion ; yet not long since 

 there must have been easy communication between these waters. 

 Kept in a glass aquarium, supplied with the weeds and running 

 water in which they live naturally, the fishes from La Fundicion 

 keep in good condition indefinitely, while the larger fishes from 

 Lake Angascancha, placed in the same aquarium, soon die. 



" Of the larger sort of fishes from Lake Angascancha, a trial 

 was made of their food qualities, but their bones are too hard. 

 It may be stated that these might be softened by pickling, but 

 even then the character of their food produces an inferior sort 

 of flesh resembling that of mudsuckers." 



The collection contains 65 specimens, 2 to 7.8 cms. long, from 

 La Fundicion, Pern, at an elevation of 13,500 feet in the extreme 

 headwaters of the tributaries to the outlet of Lake Junin, in 

 approximately 11° S. lat., 76° 10' W. long. The streams are 

 narrow but deep and ditch-like, with clean bottom, plenty of 

 water plants, and clear, rather rapid current. By dissection, 

 spawn was found in these fish in November, but none in Feb- 

 ruary. The stomachs contained gnats in all stages, flies and 

 water insects. 



