Family III.—NYCTERIDÆ.
Sub-family 1.—Nycterinæ.—Nasal apparatus concealed; tail long. Genus.—Nycteris.
Sub-family 2.—Megaderminæ.—Nose-leaf distinct; tail short. Genus.—Megaderma.
Family IV.—VESPERTILIONIDÆ.
Group 1.—Vespertiliones.—Crown of head flat, or nearly so; upper incisors close to canines; ears moderate, separate. Genera.—Vespertilio, Vesperugo, Chalinolobus, Scotophilus, Nyeticejus, Atalapha, and Kerivoula. Group 2.—Plecoti.—Head and incisors as above; ears very large, generally united. Genera—Plecotus, Synotus, Histiotus, Otonycteris, Coriuorhinus, Nyctophilus, and Antrozous. Group 3.—Miniopteri.—Crown greatly elevated; upper incisors separated from canines. Genera.—Natalus, Miniopterus, and Thyroptera.
B.—Emballonurine Alliance.
Family V.—EMBALLONURIDÆ.
Sub-family 1.—Emballonurinæ.—Tail slender; upper incisors weak. Group 1.—Emballonuræ.—Frontal bones convex. Genera.—Furia, Saccopteryx, Rhynchonycteris, and Emballonura. Group 2.—Taphozoi.—Frontal bones with a concavity; pre-maxillary bones separate in front. Genera.—Coleura, Taphozous, Diclidurus. Group 3.—Rhinopomata.—Frontal bones concave; pre-maxillaries united (a small nose-leaf). Genus.—Rhinopoma. Group 4.—Noctiliones.—First phalanx of middle finger extended in repose. Genus.—Noctilio.
Sub-family 2.—Molossinæ.—Tail thick; upper incisors strong. Group 5.—Molossi.—Middle finger with two phalanges. Genera.—Mormopterus, Molossus, Nyctinomus, and Chiromeles. Group 6.—Mystacinæ.—Middle finger with three phalanges. Genus.—Mystacina.