A. alecto is confined to montane forest above 1000 m from Peninsular Malaysia, Sumatra and Java.

In Borneo it had been recorded at Mount Kinabalu and Crocker Range in Sabah; Gunung Mulu and Bareo in Sarawak (Payne et al. 1985 ).

Kitchener et al. (1990) reported a pregnant female collected on Lombok Island in October.

Medway (1978) recorded that the months between February and June was the breeding period for the species.

This species appears to be confined to montane forest above 1,000 m (Payne et al. 1985).