Ornithomyia, habits of, 145.

Ornithoptera croesus, 206

Oscilador, 263.

Otus brachyotus, 62.

Oxypogon, 219.

Oxyurug, 248.

PAMPAS, description of, 4--9; grass, 6; Indians, 7.

Pampa sheep, 108, 110.

Papa-uirá, 254.

Parker, Professor, on rails, 222.