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By T. C. Hsu, Kurt Benirschke (auth.)

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J. L. Patton. They belong to subspecies O. t. torridus. Animals belonging to subspecies ~. ~. yankiensis (collected from Navajoa, Sonora, Mexico) showed 10 pairs of acrocentric autosomes instead of 9 pairs. Intraspecific variation is obvious. Order: Family : RODENTIA CRICETIDAE Oncychomys torridus (Southern grasshopper mouse) 2n=48 x y o x X Volume 2, Folio 63, 1968 Order: RODENTIA Family: CRICETIDAE Peromyscus eremicus (Cactus mouse) 2n =43 Volume 2, Folio 64, 1968 Order: RODENTIA Family: CRICETIDAE Peromyscus eremicus (Cactus mouse) 2n=48 AUTOSOMES: 46 Metacentrics, submetacentrics and subtelocentrics SEX CHROMOSOMES: X Large submetacentric Y Large subtelocentric The X chromosome is the most outstanding element of the entire complement, but determination of the Y is somewhat equivocal, since several pairs of autosomes have similar morphology.

S. Afr. J. Sci. 21:143, 1954. : Mystromys albicaudatus (The African white-tailed rat) as a laboratory species. Lab. Animal Care 11:180, 1967. Order: Family: RODENTIA CRICETIDAE Mystromys albicaudatus (White-tailed rat) 2n=32 x y xX Volume 2, Folio 60, 1968 Order: RODENTIA Family: CRICETIDAE Neotoma albigula (White-throated wood rat) 2n = 52 Volume 2, Folio 61, 1968 Order: RODENTIA Family: CRICETIDAE Neotoma albigula (White-throated wood rat) 2n=52 AUTOSOMES: 4 Large subtelocentrics 4 Small subtelocentrics 42 Acrocentrics or telocentrics of varying sizes SEX CHROMOSOMES: X Large submetacentric Y Medium-sized subtelocentric Identification of the sex elements is unequivocal.

Penicillatus. The populations east of Continental Divide (a total of 13 individuals) had a diploid number of 46 with 6 pairs of biarmed chromosomes (including the X), whereas those west of the Divide (a total of 63 specimens) had a diploid number of 46 but with only 3 pairs of biarmed chromosomes (including the X). The karyotypes depicted in Patton's paper belong to the latter group. The differences between the 2 karyotypes appear to be in the 3 smaller pairs of biarms in the one race which are present as acrocentrics in the other.

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