372 ON MAMMALIA FROM CENTRAL MEXICO. — [Apr. 18, 
7. Scrurus ABERTI, Woodh. 
Two specimens. Ciudad, Aug. 7 and Oct. 14, 1881. 
This is the first occurrence recorded of the present species in the 
region included in the ‘ Biologia Centrali-Americana.’ It has been 
hitherto only known from Colorado, Arizona, and New Mexico. 
These specimens, however, exactly agree with the figure given by 
Dr. Baird of his S. castanonotus ', which Mr. Allen has determined 
to be a synonym of S. aberti’. 
8. ScruRUS GRISEOFLAVUS, Gray. 
Two specimens. Ciudad, Sept. 19 and Nov. 14, 1881. 
9, TAMIAS ASIATICUS, Var. QUADRIVITTATUS, Rich. 
Two specimens. Ciudad, July 6, 1881. 
This is the first time that specimens of the genus 7'’amias have 
been obtained in Mexico. It is true that Mr. Allen® has stated his 
opinion that another species, 7’. harrisi, Aud. and Bach., probably 
extends into Western Mexico; but the evidence was not sufficient 
for Mr. Alston to include the genus in the ‘ Biologia.’ It is interest- 
ing to observe that it is the bright-coloured variety quadrivittatus, 
and not the pale washed-out var. dorsalis of New Mexico, Nevada, 
and Arizona, that is now found by Mr. Forrer in Durango. This 
fact is of course confirmatory of Mr. Allen’s opinion that 7. dorsalis 
is not specifically separable from 7. asiaticus, since we find the usual 
northern form reappearing as soon as the desert region inhabited by 
T. dorsalis is past and the country is again fertile and well wooded. 
10. SPERMOPHILUS GRAMMURUS, Say. 
One specimen. Ciudad, August 20, 1881. 
11. HesPpeROMYs LEUCOPUS, var. SONORIENSIS, LeC. 
Two specimens. Ciudad. 
12. OcHETODON MEXICANUS, De Sauss. 
Two specimens. Ciudad. 
13. Arvicota MEexicAnus, De Sauss. 
Two specimens. Ciudad. 
14. Tuomomys TALPorpDEs, Rich. 
Two specimens. Ciudad, July 24, 1881. The most southern loca- 
lity yet recorded. 
15. TaTusiA NOvEmcINCTA, Linn. 
One specimen. Ventanas, Sept. 14, 1881. 
16. DipeLpHys MurRINA, Linn. 
Two specimens. Ventanas. The most northern locality recorded. 
1 Mamm. N. Am. p. 266, pl. lxv. 2 Mon. N,-Am. Rod. p. 735, 1877. 
3 Tom. cit. p. 812. 
