24. Rhinolophus sumatranus, sp. n.

Rhinolophus petersi (non Dobson 1872 et 1878) Dobson, P. Z. S. 1880, p. 462 (specimen examined).

Diagnosis. Acuminatus section, but sella very distinctly

expanded below the middle. Width of horse-shoe 8 ’ 3 mm. Forearm 51-51 ’ 2 mm. Details. Chief characters:—(1) compared with acuminatus: the

very different shape of the sella, as described above; width at base, at expansion, and at summit: 2, 2’4, and 1 ’ 7 mm.; (2) compared with calypso: the much narrower horse-shoe. Colour. ♂ ad., in alcohol, unfaded; teeth unworn. Upper

* The skull of the species of the acuniinat-us section is much like that of _ RA. rouXi . It can, however, always be discriminateci by the broader nasal swellings. The mandible is, proportionately, longer.

side darker than “ mars-brown, ” lighter than “ burnt-umber ”; base of hairs scarcely differing in colour; under side “ russet. ” This looks like an intermediate stage between a “ dark phase ” and a “ russet phase. ” A second specimen (Göttingen Museum) is, however, quite of the same colour.

Skull. As in Rh. acuminatus .

Dentition (one skull). p3 external, p., and p4 quite in contact. p2 in row; a minute cusp, pointing inwards. The interspace between the upper canine and p1 is narrower than in acuminatus .

Measurements. Below.

Type. ♂ ad. (in alcohol). Lower Langkat, Sumatra; 1898. Presented by Herr Gustav Schneider. Brit. Mus. no. 4.4.1.1.