Abstract
Karyotypes of six species of harvest mice, representing both the sub-genus Reithrodontomys ( humulis, sumichrasti , and fulvescens ) and the subgenus Aporodon ( gracilis, mexicanus , and creper ), are described. The karyotype of R. sumichrasti (2n = 40) resembles those previously reported for R. megalotis and R. raviventris , which possess mainly metacentric chromosomes. Reithrodontomys humulis (2n = 51), R. fulvescens (2n = 50), R. gracilis (2n = 52), R. mexicanus (2n = 52), and R. creper (2n = 52) exhibit a large proportion of acrocentric chromosomes. Karyotypic evidence suggests that intrageneric relationships of Reithrodontomys may not be accurately reflected by use of the subgenera Aporodon and Reithrodontomys .
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