Microtus townsendii (Bachman)
Fig. 41
Baculum: Stalk broad, greatest length (3.0 mm.) 1½ times greatest breadth, 4½ times greatest depth; three ossified processes, median one largest, deeper and more than twice as wide as curved, shorter, compressed lateral processes and more than 2/5 as long as stalk; base broad, in dorsal view posterior profile trilobate, basal tuberosities visible; basal tuberosities well developed, medially confluent; in end-view base wider ventrally than dorsally, dorsal concavity deeper than ventral concavity; medial constriction 3/5 of greatest depth; shaft broad, at mid-point more than twice as wide as high and 1/3 as wide as base of stalk, terminally rounded.
Specimens examined: Three, all M. t. townsendii; Fort Lewis, Pierce Co., Washington, 57998, subadult; Sec. 33, T. 11S, R. 5W, Benton Co., Oregon, 79186; Sec. 5, T. 12S, R. 4W, Benton Co., Oregon, 79188.