Proceedings of the United States National Museum . Tips of hairs of upperparts varyfrom Verona Brown to Fuscous, bases from Bone Brown to Fuscous-Black; degree of differentiation between tips and bases of hairs slight;burnishing of hair tips absent or only slightly evident in most speci-mens; hairs at posterior base of auricle paler than remainder of dor-sum. Bases of hairs of underparts vary from Benzo Brown to Fuscous,tips are about Pale Pinkish Cinnamon. Immature coloration: Dor-sum smoky brown, similar to coloration of some adults. Size small for subgenus; lobes of presternum slightly expa
Proceedings of the United States National Museum . Tips of hairs of upperparts varyfrom Verona Brown to Fuscous, bases from Bone Brown to Fuscous-Black; degree of differentiation between tips and bases of hairs slight;burnishing of hair tips absent or only slightly evident in most speci-mens; hairs at posterior base of auricle paler than remainder of dor-sum. Bases of hairs of underparts vary from Benzo Brown to Fuscous,tips are about Pale Pinkish Cinnamon. Immature coloration: Dor-sum smoky brown, similar to coloration of some adults. Size small for subgenus; lobes of presternum slightly expanded;forearm averages relatively long; brain case averages relatively wideand deep, sloping up abruptly above the short, depressed rostrum;anterior nares, viewed from above, usually relatively small and angu-lar in posterior outline; median postpalatal process varies from styli-form to triangular; auditory buUa averages relatively small. Firstupperf incisor usually with^af prominent accessory cusp and always 142 PROCEEDINGS OF THE NATIONAL MUSEUM. Figure 15.—Distribution of Plecotus mexicanus G. M. Allen. Solid symbols, specimensexamined; open symbols, other records; encircled solid symbol, type locality. with at least a trace of such a cusp; upper canine somewhat reduced insize; P* usually v/ith a small anterointernal cingular cusp. Tragus(possibly also auricle) averages relatively short; cross-ribs on inter-femoral membrane average eight. Measurements: See tables 8, 14. Comparisons: Compared with Plecotus townsendii australis andP. t. pallescens, P. mexicanus is darker, with less contrast betweenbases and tips of dorsal hairs; usually fewer cross-ribs on the inter-femoral membrane; smaller tragus on the average; smaller skull; AMERICAN BATS—HANDLEY 143 deeper brain case; shorter, weaker, and more depressed rostrum;smaller auditory bullae; actually and relatively shorter maxillarytooth row; and more consistently bilobed first upper incisor. Thereis at least an indication o
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
