Baculum: In the one specimen examined, stalk broad, greatest length (2.9 mm.) 1-1/2 times greatest breadth, 3-1/2 times greatest depth; three digitate processes ossified; median process slightly less than 1/2 length of stalk, broad, dorsally curved; curved lateral ossifications shorter and more slender than median ossification; basal tuberosities well developed, angular, confluent across posterior border of projecting shelf; in end-view tuberosities projecting ventrolaterally from central shelf; dorsal surface at medial constriction flat, ventral surface broadly and deeply concave; posterior profile in dorsal view trilobate, central lobe formed by posteriorly flattened shelf, surface of attachment visible only on lateral lobes; at mid-point stalk almost twice as wide as deep, depth of shaft greater than width proximal to inflated terminus. _Specimen examined_: One from Palestine, 67104. Microtus fortis Büchner Fig. 25 Baculum: Stalk large, greatest length (3.8 mm.) 1-4/5 times greatest breadth, 4-1/2 times greatest depth; three digitate processes ossified; median ossification almost 1/3 length of stalk; lateral ossifications slender, smaller than median ossification; posterior profile of stalk in dorsal view trilobate, basal tuberosities well developed, confluent medially; in end-view dorsal concavity broader and deeper than ventral concavity; medial constriction pronounced (less than 1/2 greatest depth); lateral profile at widest point of stalk convex, becoming abruptly concave as the flange of the basal tuberosities grades into the shaft, then gradually converging to narrowest point 1/3 of length of stalk from the terminus; stalk wider than deep in proximal 2/3, circular in cross section in terminal 1/3, slight terminal inflation. A specimen figured by Ognev (1950:297) has the same general proportions, slender lateral processes, and proximal placement of the point of greatest breadth. _Specimens examined_: Two from Chipo-ri, Korea, 60443, 63841. Microtus montanus (Peale) Figs. 19, 20 and 21