It has a somewhat swollen face with little hair on the front portion, save for a moustache on the upper lip; but owing to the dark skin of the face the lack of fur is not very noticeable. The dark brown fur of the upper parts is soft and dense; behind the shoulders the hairs have buffy tips. On the underside the fur is somewhat lighter. There is little extension of fur on the wing, except a line of down on the under surface of the forearm. The membrane is attached to the base of the toes. The head and body measure about three inches, and the tail slightly exceeds two inches, the last joint being quite free of the membrane. The expanse of the wings is fourteen and a half inches. There are prominent glandular swellings on the muzzle. The ear is about three-quarters of an inch long; the short tragus--less than half the length of ear--has a straight front border and a curved hind border, with rounded tip. The canines and the inner incisors of the upper jaw are noticeably large and strong. Dental formula: _i 2/3, c 1/1, p 1/2, m 3/3 = 32_. [Illustration: _Pl. 26._ _D 44._ *Great Bat.* Showing use of tail as additional foot.] [Illustration: _Pl. 27._ _D 45._ *Serotine Bat.* Emerging from its dormitory.] The Serotine makes its appearance in public about sunset, apparently retiring early and flying again in the early morning. It frequents glades in woods, and preys upon beetles and moths. In May and June large numbers of cockchafers fall victims to it, and in July and August in Kent and Sussex it plays havoc with the local Brown-tail Moth. In the early part of its season it flies at a low height, but later it prefers an altitude between thirty and forty feet, from which, however, it frequently descends to the ground. The change is, no doubt, connected with the seasonal succession of insects with different habits. It is a sociable species, and when it retires to holes or roofs for its daytime rest it is usually in company. Its hibernation begins at the end of October. Its voice is a squeak. * * * * * The Parti-coloured Bat (_Vespertilio murinus_, Linn.) is sometimes enumerated among British Bats, but on the strength of only two specimens captured in this country, in the "thirties" of last century. As one of these was taken at Plymouth and the other at Yarmouth, it is reasonable to suppose that they were mere stragglers which had reached our shores on board ship. Had they occurred as residents their distinctive coloration--dark brown upper side mottled with yellow-brown and whitish underside--and large size, would have established their identity at once. *Great Bat* (_Nyctalus noctula_, Schreber).