Koford Molossus coibensis October 23, 1956 Barro Colorado Is., C.Z. At 5:30 p.m. I strung a mist net 30' long & 6 ft. high over grass at E. side of New Lab. Bats heard in conjugated aluminum roof. At 6:05 first bat in net, then others. About 10 extracted by 6:35 p.m. I made skins of a ? & ♀ (1820, 1921 C.B.K.), wts. of 5♀♀ 11-18½ gms. (2 were 12 gms.). Wts. 8♂♂ 17-19 gms., 4 being 18 or +. Two still alive 4 p.m. Oct. 24 tho were in refrig. all night (? & ?). The 13 bats taken by 8:30 p.m. Last night. Net visited at 2:30 a.m. & 6 a.m. but no more bats. Put up 3 of these. Mystics under conjugated aluminum roof just inside alley same building (New Lab). December 23, 1956. I strung net near W. side of New Lab & took several. One injured by another in fog & so killed. Black backs, forearm 35, ♀ with nipple slightly segmented & concentrically (1 mm. wide), 14 gms., measure- ed 95-32-7-13; adult. Others brown & apparently imm. One 10 gms., forearm 33½. Banded ♀, forearm 34½, no. 58-81506. Another, forearm 34½, 58-81505. .... 504, forearm 34. # 503, forearm 35. --- 502, forearm 34. All♀♀, banded L.wing, #1 bwd; nipple trigs not segmented. Apparently from under conjugated aluminum of roof. January 3, 1957. One netted next to Alice Creek House in evening. Examined, banded, released.