Abstract
The taxonomic significance of two chromosomal races of Geomys bursarius lutescens Merriam was analyzed using morphometric, karyotypic, and electrophoretic methods. The two races, one northern and the other southern, were well differentiated both genically and morphometrically. Neither hybridization nor introgression was observed, and the two chromosomal races appear, therefore, to be acting as separate species. However, each of the chromosomal races has genetic affinities with a more eastern nominal taxon, and previous investigators have regarded the eastern taxa as conspecific or even consubspecific. Moreover, morphometric similarities between the chromosomal races are equivalent to those found between one of the races and another chromosomal race that is regarded as a separate subspecies. The two chromosomal races of G. b. lutescens may be at an intermediate stage of speciation and reasonably could be treated as semispecies. However, for now they warrant recognition only as subspecies, one of which is described and named as new.
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