C. Koford (Bat Banding.) Myotis n. nigricans October 31, 1956 Barro Colorado Is., Qual Zone Under roof New Laboratory. Under congestions in aluminum roof, inside and lower under screen and on out- side of screen of louver, few -> many inside x-sect. louvre Most had 1 or 2 parasitic flies. These would hold tight, unnumbered disturbed. Eventually into hand & caught. Pre- served several in alcohol (+ 2 meters?). Used #0 bands, right forearm males, left females. Band No: 24-46501 -> forearm 31 long - immature 02 ov " 33 1/2 " 03 ♀ 35 ad. 04 ♀ 34 ad. 05 ♀ 33 Both nipples enlarged. 06 ♀ 35 " " " 07 ♀ 35 08 ♀ 33 Immature 09 ♀ 34 Much lacteal tissue; lact.? 10 ov 15 about 1 gram. Nearly naked, black, 11 ov 32 imm. 12 ♀ 35 Nips only; red dope put on band. 13 ♀ 36 1/2 Nips enl. 24-46514 ♀ 34 1/2 Nips enl. Last evening saw 3 hairless young together on lid of old butter can in attic above kitchen. || Examined ♀, 4 1/2 grams, forearm 33 mm. Nips 1 mm. long, flattened. No milk. Ovaries pale orange; no swollen follicles; no uterine scars. Ut. horns fligid & translucent white.