330 VESPEBTILIONID.E. 



203. Vespertilio hasselti. Van HasseWs Bat. 



Vespertilio hasselti, Temminck, Mon. Mam. ii, p. 225, pi. Ivi, figs. 7, 8 

 (1835-41) ; Slyth, Mam. Birds Surma, p. 23 ; Dobson, Mon. As. 

 Chir. p. 126 ; id. Cat. Chir. B. M. p. 291. 



Muzzle blunt, glandular area between the eyes and the nostrils 

 rather tumid, and face in front of the eyes almost naked. Ears short, 

 laid forward each extends halfway between the eye and 

 the nostril ; tips broadly rounded, the outer margin 

 straight from near the tip to opposite the base of the 

 tragus ; there a fold of the conch enters the margin 

 and forms a small terminal convex lobe ending in 

 Fi 105 Ear ^ ron ^ ^ the inner margin, which is convex throughout, 

 of ' V. hasselti Tragus moderately long, rather bluntly pointed, inner 

 (Dobson, Cat. margin straight ; outer slightly convex, with a trian- 

 Cbir. B. M.) g u ] ar lobe at the base. 



Wings from the ankles ; calcaneum very long ; 

 feet very long and slender; interferuoral membrane forming an 

 acute angle behind. Fur very short. 



The second premolar in both jaws very minute and difficult to 

 see, even with a lens ; it is, both above and below, placed in the 

 angle between the first and third premolar. 



Colour of fur greyish brown above, dirty white below ; all the 

 basal portions of the hairs dark brown on both surfaces. 



Dimensions. Head and body 2-1 inches, tail 1'75, ear outside 

 from the crown 0'4n, forearm 1*6. 



Distribution. Malay Peninsula, Siam, Sumatra, Java, &c. A 

 specimen from Burma, the exact locality not recorded, is in the 

 British Museum. 



Externally this species is a Vesperugo, and it was long referred 

 to that genus, of which it has the nearly naked face and short 

 ears, whilst the second lower premolar is much more minute than 

 in any other Vespertilio. That the distinction of these genera by 

 the dentition is artificial, especially when the teeth are mere rudi- 

 ments, is shown by such instances as are afforded by the present 

 form and by Vesperugo annectens. 



V. adversus, Horsfield (not of Temminck), has an extensive 

 range from Siam to South Australia, and may very possibly be 

 found in Burma ; indeed it is possible that it may be the Myotis 

 berdmorei of Blyth (Cat. p. 35) from Schwe Gyeng. This species 

 was, however, so imperfectly described (J. A. S. B. xxviii, p. 293), 

 that as the specimens have unfortunately been lost, it is now- 

 impossible to identify it, and its being referred to Myotis suggests 

 that it was more probably an ally of V. mystacinus. The bat 

 called V. adversus by Temminck, Blyth, Cantor, Jerdon, and others 

 was V. tnuricola. 



The true V. adversus has a foot measuring 0'48 inch, Mings 

 from the ankles, a very long calcaneum, an oval ear without emar- 

 gination, a moderately long pointed tragus with the inner margin 



