ICHTHYOLOGICAL GAZETTEER 77 
Coecama Indians; during rainy season known to have channels in communication 
with the lower Huallaga.* 
PACHACHACA: near Huancayo.** 
PacuiTEA, Rio: moderately small river, navigable to small steam craft; 
formed by the union of the Pichis and the Paleazu; its junction with Alto Ucayali 
gives rise to the Bajo Ucayali.* 
Parpay, Rio: a small, deeply entrenched stream, Dept. Cajamarca, flowing 
down eastern slope of Western Cordillera into the Rio Crisnejas near its junction 
with the upper Maranon; elevation about 4000 feet. (Pearson 1937a, pl. xi, 
fi gems) saa 
Pauca: village on Via Central below Tarma; Rio de Tarma unites with Rio 
de Palea, and the latter with the Tulumayo to form the Chanchomayo.** * 
Pautcazu, Rio: swift, boulder-strewn, clear stream becoming deeper in lower 
course, and uniting with the Pichis to form the Pachitea.* 
PAMPA DITCHES on Camino Real along the western shores of Lake Titicaca; 
sluggish streams and marshy areas with much plant, water snails, Dytiscid beetles, 
and Orestias agassizii; pampa de Acora and pampa de Ilave, elevation 12600— 
12800.* 
Pampayacu, Hacienda de: mouth of Rio Chinchao.* 
ParRANAPURA, Rio: small river skirting the foothills northwest of Yurimaguas, 
entering the Huallaga just below that city; well-populated district; canoe naviga- 
tion; numerous sand bars. (Mozans: Andes and Amazons.)* 
Pasraza, Rro: largest northern tributary of the Peruvian Amazon above 
Iquitos.* 
PazNa, village and river: the latter a small, winding stream on the pampa of 
Lake Poop6; arises on the western slope of the Eastern Cordillera of Bolivia, en- 
tering the lake on the East; above 12000 feet.* 
Presas (Prvas): village, monastery on left bank of Amazon 100 km. below 
Iquitos, at the junction of Rio Ambyiacu. The best-collected small area within 
the scope of this report. (Orton, Cope, etc.) 
PrRENE, Rio: formed near San Luis de Shuaro and La Peruvian by the 
union of the Chanchomayo and the Paucartambo; elevation 2000 feet.* 
Peri: elevation 800 meters; near Huaraz; location and drainage unknown. 
(Regan, 1912.) 
Picuts, Rro: small river with many sand bars, navigable to canoe, and in- 
termittently to small steam launches; arising in the Cadena de la Sal, flowing 
northward to the Pachitea; the terminus of the Via Central, or Pichis Trail.* 
Prepra Bianca: chacara and ford on lower Rio Chinchao.* 
Pocnocuacra: village on the Rio de Oroya, near Oroya, Dept. Junin, eleva- 
tion 14796 feet. 
PocospamBa, Laco: near Cerro de Pasco, elevation 13700 feet; collections made 
by Miss Adele Eigenmann and Mr. Emerson.** 
Pomara, city and bay: southwestern corner Lake Titicaca; bay shallow with 
much pondweed, a shelter for much fish and bird life.* 
Ponco DE MANSERICHE: rapid and water-gap of the Peruvian Amazon, 
