List of the Fauna of the County. 159 Cheiroptera. Vespertilionidae . Scotophilus noctula. The Great Bat.—This Bat, the largest of the British Cheiroptera, occurs here commonly. It is said to have a shorter period of activity than most of the order, but my experience is, that it comes out of its winter haunts in March if the season is favourable, and continues on the wing until late in October; it is to be seen flying over the river and this town, and in fact all through the valley of the Colne, in abundance, until quite the end of the month, in suitable seasons. The latest period at which I have obtained a specimen was on the 10th of November. I never find any other species hybernating with it; hollow trees appear to be its favourite resting-places, but I know a few spots where it may always be found resting between chimneys and the walls of houses. I think it is one of our most beautiful bats, the rich brown fur, smoother and finer than velvet, contrasting well with the black wings. In flight it is like the swift, rapid and high, and it well merits Gilbert White's name altivolans.3 Scotophilus pipistrellus. The Common Bat.—This Bat, a small edition of the noctule, is here, as elsewhere, the Robert F. Tomes, and Edward R. Alston. London, 1874. In the original manuscript Mr. Laver had prefixed short specific diagnoses to his remarks upon each species, but the Editor has expunged these as being unnecessary : the generic and specific characters are admirably given in Bell's work, which should, of course, be in the hands of all students of our native Mammalia. A considerable amount of information on the habits and food of some of our mammals will be found in Mr. Harting's paper on "Forest Animals," 'Transactions,' i. 74.—Ed.] 3 [See 'Natural History of Selborne,' Letters XXII., XXVI., and XXXVI. Sir William Jardine remarks :—'' The British fauna is indebted to White for the first notice of this species ; it is locally distributed, and although not common generally is found in numbers together, so many as 185 having been taken in one night from the eaves of Queen's College, Cambridge. It was first described by Daubenton under the name of 'La-noctula,' which name Latinised was afterwards continued, and is prior to White's name of Vespertilio altivolans, which we regret has not been retained, as it is so characteristic of the habits of the species." —Ed.]