Part 8 (2/2)

_Reithrodontomys chrysopsis seclusus_ Hall and Villa, Proc.

Biol. Soc. Was.h.i.+ngton, 62: 163, August 23, 1949, type from Mount Tancitaro, 7,800 ft., Michoacan.

_Reithrodontomys chrysopsis chrysopsis_, Howell, N. Amer.

Fauna, 36:66, June 5, 1914, part.

_Range._--Known only from Mount Tancitaro, from 6,000 feet elevation up to at least 11,000 feet.

_Specimens examined_, 22: nos. 51407-51411, 52110-52126, all from Mount Tancitaro, distributed by alt.i.tude as follows: 6,000 ft., 5; 7,800 ft., 10; 10,500 ft., 1; 11,000 ft., 1; no alt.i.tude recorded, 5.

_Remarks._--The 22 specimens in the Chicago Natural History Museum are remarkably uniform in color in spite of differences in age; 17 are so young as to have the first upper molar only slightly worn and 5 are adults. In preparing the original description of _R. c. seclusus_, known only from specimens in the summer pelage, comparison of color was made with only the winter pelage of _R. c. chrysopsis_ and it was pointed out that the differences noted in color between the two subspecies might be seasonal rather than subspecific. A summer specimen of _R. c. chrysopsis_ (K. U. 17980, taken on June 15, 12 km.

ESE Amecameca, 11,500 ft.), is available as the present account is being written. In direct comparison with the original material of _R.

c. seclusus_, all in summer pelage, and in comparison with a specimen of _R. c. chrysopsis_ in winter pelage (January 18), from 30 km. E Amecameca, the summer pelage of no. 17980 is more blackish than the winter pelage and therein more closely resembles that of _R. c.

seclusus_. The same is true of the more spa.r.s.ely haired tail. The ears, however, are blackish as in winter-taken _R. c. chrysopsis_.

This feature and also the large size and different cranial proportions of specimen no. 17980 are in accordance with the differences between _R. c. chrysopsis_ and _R. c. seclusus_ as recorded in the original description of the latter.

=Baiomys taylori a.n.a.logus= (Osgood)

Northern Pygmy Mouse; Spanish, Raton Pigmeo Norteno

_Peromyscus taylori a.n.a.logus_ Osgood, N. Amer. Fauna, 28:256, April 17, 1909, type from Zamora, Michoacan.

_Baiomys taylori a.n.a.logus_, Miller, N. Amer. Land. Mamm., 1911, p. 137, December 31, 1912.

_Range._--Northwestern part of state.

_Specimens examined_, 35: nos. 100331-100365, distributed by localities as follows: 8 mi. N Zamora, 5,500 ft., 2; 11 mi. W Zamora, 5,750 ft., 1; 6-1/2 mi. W Zamora, 5,950 ft., 2; 4 mi. W Zamora, 5,450 ft., 1; 3 mi. NW Patzcuaro, 6,700 ft., 21; 3 mi. N Patzcuaro, 6,800 ft., 5; 2 mi. W Patzcuaro, 6,700 ft., 3.

_Remarks._--Osgood (1909:257) has recorded this subspecies also from Acambaro and Los Reyes. We found that these animals got caught in our traps almost as often in the daytime as at night and concluded that they were less nocturnal, or at any rate more diurnal, than any of the other cricetine mice at the places in Michoacan where we trapped.

=Baiomys musculus musculus= (Merriam)

Tropical Pygmy Mouse; Spanish, Raton Pigmeo Tropical

_Sitomys musculus_ Merriam, Proc. Biol. Soc. Was.h.i.+ngton, 7:170, September 29, 1892, type from Colima, Colima.

_Peromyscus musculus_, Allen and Chapman, Bull. Amer. Mus.

Nat. Hist., 9:203, June 16, 1897.

_Baiomys musculus_, Mearns, U. S. Nat. Mus. Bull., 56:381, April 13, 1907.

_Range._--Dry, tropical, southwestern parts of state.

_Specimens examined_, 41: nos. 100366-100406; distributed by localities as follows: 1-3/4 mi. S Tacambaro, 5,700 ft., 1; 1 mi. E and 2-1/2 mi. S Tacambaro, 4,700 ft., 11; 4 mi. S and 1 mi. E Tacambaro, 10; 1 mi. E and 5 mi. S Tacambaro, 4,000 ft., 1; 6 mi. S Tacambaro, 4,000 ft., 4; 1 mi. E and 6 mi. S Tacambaro, 4,000 ft., 14.

_Remarks._--Osgood (1909:258) has recorded this subspecies also from La Huacana and La Salada. Three adult males with much worn teeth weigh, in grams, 8.3, 9.3, and 10.8. Weights of three adult, nonpregnant, females are 8.1, 9.4, and 9.7. None of our 13 females was pregnant.

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