Two New Meadow Mice from Michoacán Mexico

In preparing a list of kinds of mammals of which specimens have been saved from the Méxican state of Michoacán, two heretofore unrecognized subspecies of the Méxican meadow mouse, Microtus mexicanus , have been found. Names for these and descriptions are given below.
Microtus mexicanus fundatus new subspecies
Type. —Male, adult, skin and skull; No. 100637, Univ. California Mus. Vert. Zool.; 3½ mi. S Pátzcuaro, 7,900 ft., Michoacán, México; March 9, 1943; obtained by E. R. Hall, original no. 5882.
Range. —Known only from the vicinity of the type locality.
Diagnosis. —Size large (see measurements); color brown overlain with cinnamon; nasals expanded distally with premaxillary borders concave laterally; posterior border of orbit inclined posterolaterally; preorbital region and interparietal region depressed; incisive foramina narrow; zygomatic arches parallel; tympanic bullae much inflated.
Comparisons. —Among named subspecies of Microtus mexicanus , M. m. fundatus most closely resembles M. m. mexicanus but differs as follows: Larger in all parts measured; pelage with slightly less buffy color and with the buffy color that is present of a slightly lighter tint; posterior two-thirds of premaxillary border of each nasal concave rather than straight; posterior border of orbit forming more acute angle with sagittal plane of posterior part of skull; superior outline of nasals straight rather than depressed in posterior part; tympanic bullae more inflated both in vertical and horizontal planes.
From M. c. salvus , the subspecies next to the westward, fundatus differs as follows: Averaging larger in all parts measured; less reddish on upper parts; underparts with more reddish color but the reddish of lighter tint; perineal region buffy instead of plumbeous; nasals with premaxillary borders laterally concave rather than straight; superior outline of skull with nasal segment sloping anteroventrally and interparietal segment sloping posteroventrally rather than straight; posterior margin of orbit inclined posterolaterally thus forming an acute angle, instead of a right angle, with sagittal plane of braincase; zygomatic arches parallel rather than bowed outward; incisive foramina narrower; tympanic bullae more inflated in vertical plane.