Though similar to the Serotine in size and to the Pipistrelle in form, the Great Bat or Noctule was recognised as a distinct species long ago. We might with great fitness call this White's Bat, for it was the Selborne naturalist who first called attention to it as a native species, under the name of _altivolans_, suggested by its high flight. Schreber, however, had some years previously named it _noctula_, basing his description upon a French specimen. White refers to it several times, and in his xxxvith letter to Pennant gives particulars which the latter included in his "British Zoology." Part of White's description is worth quoting. He says: "In the extent of their wings they measured fourteen inches and a half; and four inches and a half from the nose to the tip of the tail; their heads were large, their nostrils bilobated, their shoulders broad and muscular; and their whole bodies fleshy and plump. Nothing could be more sleek than their fur, which was of a bright chestnut colour.... They weighed each, when entire, full one ounce and one drachm. Within the ear there was somewhat of a peculiar structure that I did not understand perfectly! [? tragus] but refer it to the observation of the curious anatomist. These creatures sent forth a very rancid and offensive smell." To add to White's description, it may be said that the general form is robust and heavy, the forearm massive, the wing long and slender, its narrowness being due to the shortness of the fifth finger. The lower leg is short and thick and the foot broad and powerful. The muzzle is broad and has a glandular swelling between eye and nostril. The nostrils project forward and outward and there is a distinct concavity between the two crescent-shaped orifices. The ear is short--when flattened it is broader than long--with the front border rounded to the tip; its inner surface covered with short hairs. The ears are far apart. There is a very short, downy, bow-shaped tragus, broader above than below. The long, soft, golden-brown fur is abundant, and extends over the face and a short distance over the wing; it is paler and duller on the lower parts. On the underside there is a narrow band of fur below the arm bones. The last joint of the tail is free. The membrane and ears are blackish. [Illustration: _Pl. 28._ _D 46._ *Leisler's Bat.* Nyctalus leisleri.] [Illustration: _Pl. 29._ _D 47._ *Great Bat.* Alighting after daytime flight.] The dentition is: _i 2/3, c 1/1, p 2/2, m 3/3 = 34_. The Great Bat, as one would expect from the shape of the wings, has a quick, dashing flight reminding one of that of the Swifts, with which, indeed, it may be seen high in the air hawking for the same prey. It often glides down obliquely on expanded wings. It flies at twilight and again at dawn, as well as in the daytime occasionally. It has a shrill, clear, cricket-like voice.