Type from Formosa. No. 46001 Field Museum of Natural History. Adult male in alcohol. Collected by M. Maki.

Characters.— A member of the luctus group, about the size of beddomei. Sella higher but narrower than that of trifoliatus. Lancet long, sides not concave, tip blunt, forming a long triangle. Ears with short, blunt point, being but slightly concave on outer edge. Wing structure and attachment as in all other members of the luctus group. Color very dark brown.

Skull about the size of beddomei but much narrower. Sagittal crest sloping gradually toward post-nasal depression. Upper premolar two in row; lower premolar three in row, but in type more crowded on one side than on the other.

Measurements— Forearm 60.2; third finger, metacarpal 40.4, first phalanx 23.5, second phalanx 30.5; fourth finger, metacarpal 47.4, first phalanx 12.5, second phalanx 21.8; fifth finger, metacarpal 48.8, first phalanx 14.4, second phalanx 21.8. Ear 32; tibia 32.8; tail 39.8. Skull broken: greatest length 27.4; width across nasal swellings 6.5; zygomatic width 12.4 plus; mastoid width 11.7; width of braincase 10; upper toothrow 10.2.

Specimens examined.— One, the type.

Remarks.— The nearest geographic neighbor of Rhinolophus formosae is. lanosus from Fukien, which it resembles in some characters, although it is much smaller. Considering the solitary and retiring habits of this group of bats it is not surprising that a member of it has not been found in Formosa until now.