PAPERS OF GENERAL INTEREST 33 



Collections were made in Lake Titicaca at Moho and 

 Vilqiie Cliico ; in the meadow ponds of Huancane ; the E. 

 de Hiiacane, Lake Arapa, R. de Clmpa, R. de Azangaro, 

 and R. Porqne. Lagima Salinas is too saline for fishes. 

 In fact nothing living was found in it except certain 

 phyllopod Crustacea, Ai'temia salina (reported for the 

 first time from the continent, though found in all other 

 continents). These were very abundant, and in all stages 

 of development simultaneously. Flamingoes were feed- 

 ing constantly in the lake. 



Lake Umayo, five leagues inland from Puno, is very 

 rich in several species of Orestias. It abounds also in 

 freshwater sponges, which form masses covering the 

 roots of aquatic plants and exposed bowlders to a depth 

 of one-fourth inch or more. Thanks to the hospitality 

 and cooperation of Sr. Francisco P. Valcarcel I was able 

 to obtain excellent collections there, and to visit the ruins 

 of Silustani and Atunorco. 



On the Bolivian side of Lake Titicaca fishes were ob- 

 tained at Puerta Acosta and Guaqui. The Rio de Tiahu- 

 anacu was fished near the ruined ''House of the Sun" 

 at Tiahuanacu, and the Rio Colorado near Viacha. 



La Paz marks the upper limit to which Atlantic drain- 

 age has invaded the pampas of the Titicaca-Poopo basin. 

 Unfortunately the only fish obtained here turned out to 

 have been introduced artificially from the Pacific slope 

 near Mollendo. It is doubtful whether native fish ever 

 reach this elevation, 12,000 feet, in the River Chuquiapo. 

 The current is very rapid and the water polluted with 

 sewage 



Xear Calacoto the Rio de Calacoto, R. de Corocoro, 

 and R. Desaguadero were fished. The last is the outlet 

 of Lake Titicaca into Lake Poopo. Since it is retarded 

 here in a narrow gorge, there is great seasonal variation 

 in the level of the lake above — as much as five feet be- 

 tween extremes. 



Other tributaries of Lake Poopo ^-isited were : R. de 

 Eucaliptus, R. de Poopo, R. de Pazua, R. de Challapata, 

 all to the east ; southward, Rio Mulato and Rio Grande de 

 Lipez. 



