. [Collected reprints, 1912-1919. Mammals; Mammals; Birds. Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 451 Family VESPERTILIONID^. Typical Bats. This is by far the largest family belonging to the order. Its mem- bers are insectivorous, nocturnal and crepuscular; and are characterized by having the ears separate, with a small anterior basal lobe and tragi well developed. The muzzle is simple, without fleshy appendages (differing in this from the so-called Leaf-nosed Bats); tail attached to interfemoral membrane and extending to its edge or slightly beyond; clavicle present and well de
. [Collected reprints, 1912-1919. Mammals; Mammals; Birds. Feb., 1912. Mammals of Illinois and Wisconsin — Cory. 451 Family VESPERTILIONID^. Typical Bats. This is by far the largest family belonging to the order. Its mem- bers are insectivorous, nocturnal and crepuscular; and are characterized by having the ears separate, with a small anterior basal lobe and tragi well developed. The muzzle is simple, without fleshy appendages (differing in this from the so-called Leaf-nosed Bats); tail attached to interfemoral membrane and extending to its edge or slightly beyond; clavicle present and well developed; radius long and curved; ulna rudimentary; pollex free from and extending beyond edge of wing membrane, ending with a hooked claw; presternum with prominent "keel" for the attachment of the large pectoral muscles; ribs much flattened and occasionally more or less anchylosed at their margins; cerebral hemispheres smooth; placenta discoidal and deciduate; mam- mae thoracic; testes abdominal or inguinal. The milk teeth are unlike the permanent teeth and are usually replaced by the latter at an un- usually early period, the cranial sutures become anchylosed and often disappear much earlier in life than in most of our mammals. The structural character of the hair is peculiar.* Of the 100 or more North American species and subspecies, nine species belonging to 6 genera are known to occur within our limits, and it is probable that another genus and species {Corynorkinus macrotis) and possibly a representative of another family (Nyctinomus depressus) may ultimately be added to the list. KEY TO THE GENERA. GROUP 1. Upper incisors (front teeth between canines) 2. Upper surface of interfemoral membrane (membrane connecting tail with legs) completely furred; whole number of teeth 32. Genus NYCTERIS, p. 470. Upper surface of interfemoral membrane entirely bare or furred slightly at extreme base; whole number Front view, showing up- of teeth 30. Genus NYCTICEIUS, p. 475.
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