. Smithsonian miscellaneous collections. tatives of which are recognizable by peculiar,low, somewhat funnel-shaped ears, long, slender limbs, large inter-femoral membrane and the absence of nose leaves. The skull is longand narrow, with high subglobose braincase; the palate is excisedanteriorly, but the premaxillse meet in the median line in front of twowell-developed foramina; postorbital processes are absent. Genus NATALUS GraySalient characters of the only known continental genus of thisrestricted group have been given under the family. In addition, thelong, thread-like tail crosses the int
. Smithsonian miscellaneous collections. tatives of which are recognizable by peculiar,low, somewhat funnel-shaped ears, long, slender limbs, large inter-femoral membrane and the absence of nose leaves. The skull is longand narrow, with high subglobose braincase; the palate is excisedanteriorly, but the premaxillse meet in the median line in front of twowell-developed foramina; postorbital processes are absent. Genus NATALUS GraySalient characters of the only known continental genus of thisrestricted group have been given under the family. In addition, thelong, thread-like tail crosses the inter femoral membrane, which isnaked, except for a thin line of fringing hairs along the posteriormargin. The teeth are 38 in number. NATALUS MEXICANUS Miller Mexican Straw-colored Bat Nafalus mexicanus Miller, Proc. Acad. Sci. Philadelphia, p. 399, September12, 1902. Type from Santa Anita, Lower California, Mexico. Rich golden yellow appears to be the normal color of Natalusmexicanus, but individuals vary to dark brown. The color in con-. Fig. 18.—Natalus 52117, U. S. Nat. Mus. About nat. size. junction with the thin papery ears and flying membranes will aid inidentification of the species. Its occurrence in Panama is knownonly from the record by Allen (1904, p. 78) of a single specimen 212 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 collected by J. H. Batty on Coiba Island. In reduced size, mostobvious in the length of the skull and toothrows, this example agreesclosely with the Mexican form which is probably a small, geographicrace of Natalus The forearm measures and theupper toothrow (front of canine to back of posterior molar) 64millimeters. Specimens examined: Coiba Island, I. Family VESPERTILIONIDAE. Common Bats Most of the common bats of northern latitudes are included in thefamily Vespertilionidse which, with several subfamily divisions,ranges over the greater part of the land surface in both the easternand western hemispheres. The Ist
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