Ears oval-triangular, shorter than the head; tragus small, arcuate, terminating in a broad round head : fur short, of a uniform reddish brown above and below.
V. Noctula, Desm. Mammal, p. 136. Flem. Brit. An. p. 6. La Noctule, Buff. Hist. Nat. torn. vm. pi. 18. f. 1. Great Bat, Penn. Brit. Zool. vol. 1. p. 146. pi. 13. no. 38.
Length of the head and body two inches eleven lines; of the head ten lines; of the tail one inch eight lines; of the ears seven lines and a half; of the tragus two lines and a half; breadth of the ears six lines; of the tragus one line and a half; length of the fore-arm two inches; of the thumb two lines and a half: extent of wing fourteen inches.
Head very broad; muzzle short and thick in the adult state, though less so than in the last species, somewhat elongated when young; nostrils tumid at the edges, slightly bilobated; forehead very hairy; rest of the face almost naked: ears shorter than the head, somewhat triangular, rounded at the extremity; the posterior margin folded back, with a projecting ridge internally, and a small protuberance at the base, which extends round nearly to the corners of the mouth; tragus very small, somewhat arcuate with the bend directed inwards, terminating above in a broad round head. Fur rather short, but soft and thick, of a uniform reddish brown colour above and below: membranes dusky, with a ridge of hair along the bones of the arm. Tail shorter than the fore-arm, protruding from the interfemoral membrane to the extent of a line and a quarter.
Common in many parts of the country, but only to be seen on wing during the summer months. Flight high and rapid. Habits gregarious. Retires early in the Autumn into hollow trees, and beneath the roofs of large buildings. Has a strong disagreeable smell.