A review of the genera Myotis, Ia, Pipistrellus, Hypsugo, and Arielulus (Chiroptera: Vespertilionidae) from Myanmar (Burma), including three species new to the country Author Bates, Paul J. J. Harrison Institute Centre for Systematics and Biodiversity Research Bowerwood House St Botolph’s Road Sevenoaks Kent TN 13 3 AQ Great Britain; E-mail: hzm @ btinternet. com hzm@btinternet.com Author Nwe, Tin Department of Zoology University of Yangon Yangon Myanmar Author Bu, Si Si Hla Department of Zoology University of Yangon Yangon Myanmar Author Mie, Khin Mie Department of Zoology University of Yangon Yangon Myanmar Author Swe, Khin Maung Department of Zoology University of Yangon Yangon Myanmar Author Nyo, Nyo Zoology Department University of Veterinary Science Yezin Myanmar Author Khaing, Aye Aye Department of Zoology University of Yangon Yangon Myanmar Author Aye, Nu Nu Department of Zoology University of Yangon Yangon Myanmar Author Toke, Yin Yin Department of Zoology Dawei University Tanintharyi Division Myanmar Author Aung, Naing Naing Department of Zoology Hinthida University Ayeyarwady Division Myanmar Author Thi, Mar Mar Zoology Department, University of Distance Education, Yangon, Myanmar Author Mackie, Iain Harrison Institute, Centre for Systematics and Biodiversity Research, Bowerwood House, St Botolph’s Road, Sevenoaks, Kent TN 13 3 AQ, Great Britain text Acta Chiropterologica 2005 2005-09-01 7 2 205 236 journal article 10.3161/1733-5329(2005)7[205:AROTGM]2.0.CO;2 1733-5329 3942897 Myotis horsfieldi Horsfield’s Bat Vespertilio horsfieldii Temminck, 1840: 226 ; Mount Gede, Java New material from Myanmar Kayin State : Bayint Nyi Cave, 14.11. 2002, 1 ♂ (H15); Mon State : Indian Single Rock Temple Cave, 19.11.2002 , 1 ♂ (H23) and -.5.2003, 1 ♂ (KMM1). Previous records from Myanmar Mon State — Kyauk-Ta-Lone ( Bates et al. , 2001 ). Diagnostic description A medium-small species of Myotis with a forearm length of 33.8, 34.0 mm based on two specimens from Myanmar ( Table 4 ) (FA = 36.5–41.5 mm in Bates and Harrison, 1997 ; 34.3–36.8 mm in Hendrichsen et al. , 2001 and 34 –37 mm in Borissenko and Kruskop, 2003 ). The dorsal pelage is dark- grey brown. The ventral pelage is paler, with buff-brown hair tips and dark roots. The feet are enlarged and exceed half the length of the tibiae. The wings are attached to the outer metatarsals of each foot. The upper canine (C1) is nearly twice the height of the third upper premolar (P4). The second upper premolar (P3) is about half the crown area of the first (P2) and usually lies within the toothrow. The lower canine (C1) exceeds the third lower premolar in height (P4). The second lower premolar (P3) is about half the crown area of the first (P2). Similar species The distinction of M. horsfieldi from M. hasselti is discussed above. Taxonomic notes The external, skull and dental measurements of the Myanmar specimens are small when compared to those listed in Hill (1983) for M. h. peshwa ( Thomas, 1915 c ) from peninsular India and M. h. deignani Shamel, 1942 from Thailand . They compare more favourably to those of the nominate race from Malaysia and Java. Ecological notes In Myanmar , all three specimens were found in or near limestone caves. Initially collected in March, 2001 near Kyauk- Ta-Lone village, it was flying over a small watercourse that runs through an area of agricultural land, disturbed woodland and limestone outcrops ( Bates et al. , 2001 ). Subsequently in May, 2003, it was collect- ed again in the same vicinity at Indian Temple Cave, which is situated some 800 m from the original point of capture. The last individual was collected in the tunnel- like limestone cave of Bayint Nyi, which is an area of disturbed woodland and some agriculture.