x. Key to Molossidae (* denotes records in Sumatra but not in BBSL)

1.1. Ear triangular; ear integument thin; FA 38 mm ............................................ Mormopterus doriae *

1.2. Ear rounded; ear integument thick...................................................................... 2

2.1. Naked, only scattered hairs; FA 65–85 mm; BM 115–180 g ................................. Cheiromeles torquatus

2.2. Hairy, fur thick; FA <52 mm; BM <30 g ................................................................ 3

3.1. Interaural band of skin thick, rises vertically at center, forming a pocket between ears; FA 44–49 mm ................................................................................................. Chaerephon johorensis *

3.2. Interaural band of skin thin, not raised at center, no interaural pocket.......................................... 4

4.1. Dorsal fur predominantly reddish-brown; HF 11–13 mm; BM 16–22 g; one upper premolars; FA 41–46 mm ... Mops mops *

4.2. Dorsal fur predominantly grayish-brown; HF 8–9 mm; BM 10–18 g; two upper premolars (P 2 very small and unicuspid); FA 40–50 mm ...................................................................... Chaerephon plicatus *