Proceedings of the United States National Museum . proximal articular surface of the radius is expanded,and the presternum has the ventral lobe enlarged and the posteriorlobe laterally expanded (fig. 5). P. auritus has departed from theusual phalangeal pattern of Plecotus and Euderma, in which the secondphalanx of the third digit is longer than the first (by a slight elongationof the first phalanx and a considerable shortening of the second),rendering not only the proportion different but the combined lengthless (fig. 6). The calcaral keel, present in P. phyllotis, is lacking inthe other speci
Proceedings of the United States National Museum . proximal articular surface of the radius is expanded,and the presternum has the ventral lobe enlarged and the posteriorlobe laterally expanded (fig. 5). P. auritus has departed from theusual phalangeal pattern of Plecotus and Euderma, in which the secondphalanx of the third digit is longer than the first (by a slight elongationof the first phalanx and a considerable shortening of the second),rendering not only the proportion different but the combined lengthless (fig. 6). The calcaral keel, present in P. phyllotis, is lacking inthe other species of Plecotus. Hamilton (1949, p. 100) pointed out distinctions between thebacula of P. rafinesquii and P. auritus (as described and figured byMatthews, 1937, p. 222). However, intrageneric discrepancies ofsimilar magnitude seem also to exist among the several species ofMyotis, Pipistrellus, and Lasiurus as described and figured by thesesame authors. Krutzsch and Vaughan (1955, p. 99) described the PLECOTUS (COTYNORHINUS) RAFINESQUIIUSNM 297EI8. PLECOTUS (PLECOTUS) flURITUSUSNM 18487
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