No. i.] Allen on Mexican Mammals. 185 



Furthermore, in cervicalis the only rufous tint present is the tip- 

 ping of the hairs of the nuchal and rump patches, while in leucops 

 it more or less deeply suffuses the whole sub-apical portion of the 

 dorsal pelage. 



S. cervicalis ranges from the Plains of Colima (to which, ac- 

 cording to Dr. Buller, it migrates in winter) up to the summits of 

 the neighboring Sierras, some of the specimens being labeled as 

 taken at an altitude of 12,000 feet, while S. leucops and S. aureo- 

 gaster both come only from the tierras calientes of eastern and 

 southeastern Mexico. These two occur together, however, in 

 the neighborhood of Tehuantepec, as shown not only by the 

 present collection, but by material which passed through my 

 hands in 1876. Then, as now, I considered them distinct 

 species. 



Probably S. cervicalis has, like the next species, a rather re- 

 stricted distribution, the specimens received from Dr. Buller being 

 all from the mountains of Colima, except one taken in January, 

 on the plains at the base of the Sierra. 



27. Sciurus nayaritensis Allen. 



Sciurus alstoni ALLEN, Bull. Am. Mus. Nat. Hist., II, No. 3, Art. XVI, Oct. 



21, 1889, p. 167 (not S. alstoni Anderson, 1878). 

 Sciurus nayaritensis ALLEN, Bull. Am. Mus. Nat. Hist., II, No. 4, Feb. 1890. 



p. vii. 



No specimens have been received since those already described 

 (1. c.). Attention, however, should be called to the change of 

 name, published Feb., 1890, in "Additions and Corrections" to 

 Volume II of this Bulletin, that originally given proving to be 

 preoccupied. 



28. Spermophilus grammurus macrourus {Bennett}. ' 

 Three specimens, male and female adult, and a young (half-grown) 

 female, Zapotlan, Jalisco, Dec. 13, 17, and 23, 1889. (See also 

 this Bulletin, II, p. 170.) These scarcely differ from the four 

 April specimens previously recorded, although taken at the 

 opposite season of the year. They bear out all that was claimed 

 for this subspecies in my former paper. 



29. Spermophilus spilosoma Bennett. Two specimens, 

 Zacatecas. (See this Bulletin, II, p. 172.) 



