_Color._--Spot between eyes, band confluent with color of underparts on each side of head extending anterodorsally anterior to each ear, and posterior half to third of each upper lip white, or whitish tinged with some shade of yellowish; chin and lower lip white; dark spot posterior to each angle of mouth of varying size but uniformly present; tip of tail black; remainder of upper parts Buckthorn Brown of Ridgway or a trifle browner than tone 4 of Brown Pink of Oberthür and Dauthenay, pl. 297. Upper parts of uniform color except for slight darkening of head-markings anterior to ears. Underparts Ochraceous-Buff to Warm Buff. Color of underparts extends distally on posterior sides of forelegs over toes onto antipalmar faces of feet and wrists, on medial sides of hind limbs over antiplantar faces of toes and sometimes tarsal region. Least width of color of underparts averaging, in 9 specimens from Fresno, Selma and Los Banos, 54 (32-74) per cent of greatest width of color of upper parts. Black tip of tail in three males (one subadult and 3 adults) averages 55 (50-60) mm. long. Thus longer than hind foot and averaging 34 per cent of length of tail-vertebrae. _Skull and teeth._--Male (based on 2 adults from Fresno and one from Selma): See measurements and plates 21-23, 30. As described in _M. f. nigriauris_ except that: Weight 3.8 grams; basilar length, 43.7 (43.4-43.9); least width of palate more or less than lateral length of P4; length of tympanic bulla more than length of lower molar and premolar tooth-rows. Female (no. 2626 W. E. Snyder, from Selma): See measurements and plates 34-36. As described in _M. f. nigriauris_ except that: Weight, 2.5 grams; basilar length, 39.4. The skull of the female is 34 per cent lighter than the average for the three males. Compared with skulls of _nevadensis_ from the Sierra Nevada, those of the two adult males from Fresno differ as follows: M1 wider (transversely); tympanic bullae narrower; preorbital part of skull smaller. Comparison with _pulchra_ is made in the account of that subspecies. Compared with skulls of adult males of _nigriauris_, from Santa Clara County, the two skulls from Fresno are generally smaller and in basilar length, length of tooth-rows and measurements of the teeth fall below the minimum for _nigriauris_. Relative proportions of the skulls are approximately the same. Comparison with _munda_ reveals essentially the same differences as does comparison with _nigriauris_ except that the difference in size is greater.