Abrothrix Nov. 3- La Primavera. Specimens caught by Anita above the amber cave and kept until Nov. 4 7 p.m.: 33 g male. testis 11, sv 20; testes, accessories, and penis weigh 2.1 g; testes alone 0.65g. The contents of the seminal vesicles is cheesy when extruded, seems to get a little more rubbery when mixed with minced ?coagulating gland. 36g male. Did not fight with above when put together in a bucket. testis 11, sv 18mm; Unflexed penis is 24 mm long, the distal flexure is 9mm; tetes, accessories and penis together weigh 1.9 g; testes alone weigh 0.6g. 41 g male. Penis 23 mm total, 10mm to the flexure. Testis 10, sv 21. Testes, accessories, and penis weigh 2.5g; vesicular fluid milky, when mixed with coagulting gland became cheesy but not rubbery. Both testes together weigh 0.7g. 34g female. vagina open, nipple small, Rt. horn with 2 fetuses, 12mm bumps, ovary with 8 corpora lutea of different sizes, 4 of them large; left uterus 2 fetuses, left ovary 5 c.l. 34g female. vagina closed, nipple med-large, milk expressible, uteri with 4 scars (2 and 2), ovaries with many CL.,considerable mammary tissue. Entire UG weighs only 0.1g. December 1- 30 km NNW Pilcanyieu (Rio Pichi-Leufu). Caught 2 Abrothrix, one of them a juvenile, the other an adult breeding male which was perfused and the head saved for Noemi de Esperoni.