Mr. C. B. Moffat says they "cram themselves to bursting point either once or twice in the twenty-four hours, during a seventy minutes career of mad excitement among the twilight-flying beetles and gnats." They also take moths and other insects; but in captivity they have resolutely refused to eat such "warningly coloured" species as the Cinnabar and Magpie moths. It is proved that at one meal they will consume food equal to a fourth of their own weight. When one considers the lightness of insects the amount of good these purely insectivorous creatures effect is obvious. Their resorts are in hollow trees and under the eaves of buildings, where numbers may associate together, especially in hibernation. Their presence is often indicated by thick layers of excrement. The Great Bat flies all through the year with the exception of January and the latter part of December. Pied and almost black variations from the normal colouring have been recorded. The sexes are said to separate into distinct colonies in the summer: the females retiring to trees. The single young is born naked and blind towards the end of June. When they get their fur they are much darker than the adults. Although the Great Bat is generally distributed as far north as Yorkshire, Durham, and the Lake District, it is common only in the South of England, from Norfolk to Cornwall, but is rare in the Isle of Wight. It is not recorded from Ireland. Formerly, it was not considered a native of Scotland, but in recent years several examples have been captured there. It is found throughout the greater part of Europe and adjacent parts of Asia. *Leisler's Bat* (_Nyctalus leisleri_, Kuhl). It is not necessary to give a detailed description of Leisler's or the Hairy-winged Bat, for it is a miniature edition of the Great Bat in a darker binding. The length of the head and body is two and a half inches and of the tail an inch and a half. The wing expanse is thirteen inches and a quarter. The fur on the upper parts is a darker brown than that of the Great Bat, but it is lighter on the under parts. The skull is only half the size of that species, and the entire build is lighter and less massive. Owing to this difference in size it is not so likely to be mistaken on the wing for the Great Bat as for the Common Bat. It is without the strong odour of the Great Bat. It agrees with the latter in its high flight, but its movements are not so swift and are more zigzag.