. The families and genera of bats . Bats; Bats. 202 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. cutting edge, the third much wider, subterete, with three or four tubercles. Canines well developed, simple, with distinct though rather small cingulum and no secondary cusps. Cheek teeth both above and below strictly normal, m1 and m 2 rather narrow on inner edge and with hypocone absent or very imperfectly developed, to 8 with three commissures and four or five cusps, according to the varying condi- tion of the metacone, m 3, with second triangle smaller than first, but with all the elements of th
. The families and genera of bats . Bats; Bats. 202 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. cutting edge, the third much wider, subterete, with three or four tubercles. Canines well developed, simple, with distinct though rather small cingulum and no secondary cusps. Cheek teeth both above and below strictly normal, m1 and m 2 rather narrow on inner edge and with hypocone absent or very imperfectly developed, to 8 with three commissures and four or five cusps, according to the varying condi- tion of the metacone, m 3, with second triangle smaller than first, but with all the elements of the tooth complete. Skull slender and lightly built, without special peculiarities of form, the rostrum nearly as .ong'as braincase, the depth of braincase, including audital bulla, about equal to mastoid breadth, the sagittal crest low, but usually distinct, the palate deeply emarginate in front, abruptly contracted behind, the sides of its posterior exten- sion parallel. Audital bullae well devel- oped and covering more than half sur- face of cochleae, but simple in form and not very large, their diameter about equal to the distance between them. Ear well developed, slender, occasionally rather large; tragus slender and nearly or quite straight. Foot very variable in size, but never peculiar in form. Tail about as long as outstretched leg. Inter- femoral membrane large, its surface furred at extreme base above. Species examined.—I have examined about half the known forms of Myotis. Remarks.—Myotis appears to be the most primitve genus of Vespertilionidse, as it not only retains the maximum number of teeth known in the order, but it also has the slightest possible degree of special modifica- tion in external form:. Fig. 31.—Pizonyx vivesi. Guaymas, Mexico. No. 123701. xlf. Genus PIZONYX Miller. 190(i. Pizoniix Miller, Proc. Biol. Soc. Washington, XIX, p. 85, June 4 1906. Type-species.—Myotis nvesi Menegaux. Geographic distribution.—Known only from two localities in nor
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Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectbats, bookyear1907
