Kerivoula pellucida (Waterhouse, 1845)

Vespertilio pellucidus Waterhouse, 1845: 6, Phil- ippines.

PSU-M 05.8 (field no. SB 030508.18), ♂, 8 May 2003, Ai-kading stream, Bala Forest, Hala-Bala Wildlife Sanctuary, Wang District, Narathiwat Province, 05°48’9”N, 101°49’15”E, collected by S. Bumrungsri and members of the Hala-Bala bat research team.

Taxonomic Notes

This is a small Kerivoula with a relative- ly long tail (Table 4). The internal aspects of the ears, including the tragus, are orange; the ear margins are dark and there is an emargination on the posterior border (Fig. 2e). The snout is also orange. The dorsal pelage is pale orangebrown with grey hair bases. The ventral pelage is lighter. The wing membranes are dark brown with a thin, light creamy-white border. The tail is long and the membrane on the dorsal sur- face is hairy. A glandular diamond-shaped swelling (6.5 mm in length by 3.1 mm in greatest width) is present on the fourth vertebra of the tail. The skull has an abruptly elevated, bulbous braincase. The rostrum has a well developed sulcus and a deep U-shaped narial emagination. The post palatal extension is narrow (1.3mm). The crown width of the first upper premolar (P 2) slightly exceeds its antero-posterior length. The second premolar (P 3) is almost circular in outline with a crown area and height about equal to that of P 2. In the lower denti- tion, the first premolar (P 2) is about equal in crown area to the second (P 3), which is about 85% of the crown area of the third (P 4). They are all equal in height.

Distribution and Ecological Notes

Kerivoula pellucida is currently record- ed from Malaysia, Sumatra, Java, Borneo, and the Philippines (Simmons, 2005). This is the first confirmed record from Thailand. In Bala Forest, it was found in the dry season flying up and down small trails (2 m wide) in riverine pristine lowland ever- green forest. Additionally, two further indi- viduals (forearm lengths of 30.1, 31.7 mm), which were not taken as voucher speci- mens, were caught over a small stream (4–7 m wide) in Bala and Hala Forests respec- tively. In Ton Nga-chang Wildlife Sanctuary, Songkhla Province, three individuals were captured in old growth secondary forest. None was kept as a voucher speci- men. All the sites are less than 200 m a.s.l. A female captured in Bala Forest in mid May, 2003, was lactating.