The seasonal chronological events of the repreductive cycle in the male sheath-tailed bat T. longimanus and changes in structure and function of accessory sex organs were studied at Varanasi (latitude: 25° N, 83°E). The first peak of spermatogenesis was ob served in September with the appearance of spermatozoa. The spermatogenic arrest in win ter dormancy (December) was followed by a second peak of spermatogenesis in January.This perbo coincides with ovulation in females. The third peak of spermatogenesis started after regression in late April, and completely regressed tubules were found after May. The cycle of accessory sex gland complex generally paralleled the testicular cycle, reaching maxi mum hypertrophy from September to January and again in late April. Thereafter, the ac cesory sex glands involuated. Spermatozoa were present in the cauda epididymidis through out the year. The reproductive cycle in family Emballonuridae varies with changes in lati tude, and this was so even in members of the same species. The presence of spermatozoa in the cauda epididymidis throughout the year is an interesting feature in the reproductive cy cle. Temperature and photoperiod do not play a regulatory role in reproduction in T.
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