Among named subspecies of _Baiomys taylori_, _B. t. taylori_ most closely resembles _B. t. subater_ to the north in Texas. Nine specimens examined from Yoakum are intergrades between _taylori_ and _subater_. These specimens have the sooty dorsal color of _subater_, but ventrally are inseparable from topotypes of _taylori_. In length of body and tail, specimens from Yoakum are like _subater_, but in length of hind foot, they are intermediate between the two subspecies. Cranially, they are like _subater_. When all characters are considered, the specimens are best referred to _subater_. Bailey (1905:103) suggested that specimens from the southern part of the range, which he ascribed to _subater_, tended to a more grayish color than topotypes of _subater_, therefore, grading into _taylori_. The zone of intergradation runs from Matagorda Bay northwest through Lavaca County, thence north to the Colorado River, and closely follows the boundary between the Lower Austral and Humid Division of Lower Austral Life-zone as plotted by Bailey (_loc. cit._). Findley (1955:44) pointed out that where two life-zones meet, the resulting populations of shrews are mostly intergrades. Such is the case between these two subspecies of _Baiomys taylori_ in an area where life-zones might seem less important than in the mountainous west. In the southern part of the range of _taylori_, intergradation occurs between _B. t. taylori_ in western Tamaulipas and _B. t. fuliginatus_ in the mountains of San Luis Potosi. Dalquest (1953:156) found no indication of intergradation between the two species, _B. taylori_ and _B. musculus_, in San Luis Potosi. After examination of specimens from San Luis Potosi, I am in agreement that they are all referable to the species _taylori_.