16 Oryzomyi longicaudatus April 18 Puerto Best. Caught 5 in 20 traps around the meadow. Two of them were body eaten by rats and one of these was dissected, but it was carrying a full term fetus. Nov. 9 3 km NW Confluencia dissected: ♀♀ ♂♂ 23 g mullip, no cl 34 g testis 6 1/2, tube inc, sperm? 30 g 4 bump earbugger 25 g test 5 1/2, SV 9, tube not ins. 23 g uterus red, no big cl 28 g " SV 11 " " " 25 g mullip, no cl [uterus] 45 g test 6, SV 12, tube barely ins. [stamina] 18 g mullip, no cl " 23 g mullip with cl 31g parous, no cl, umb fist. Nov. 19 Rio Caleufri, 28 km NNW Confluencia, Prov. Neuquén 32 g parous, no cl Nov. 21 [illegible] Rio Cuyín Manzano 25 g 4 bump earbugger 45 g testis 8, SV 10 breed. 36 g twisto 7, SV 9 tube bad, vis Nov. 21 Rio Cuyín Manzano: a large Oryz when released bounded to various sheltered spots and after some harassment climbed up a large cypress tree and stayed there.