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Show 3/2 ON MAMMALIA FROM CENTRAL MEXICO. [Apr. 18, 7. SCIURUS 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. aberti2. 8. SCIURUS 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 Tamias have been obtained in Mexico. It is true that Mr. Allen 3 has stated his opinion that another species, T. 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 interesting 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 T. dorsalis is not specifically separable from T. 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. HESPEROMYS LEUCOPUS, var. SONORIENSIS, LeC. Two specimens. Ciudad. 12. OCHETODON MEXICANUS, De Sauss. Two specimens. Ciudad. 13. ARVICOLA MEXICANUS, De Sauss. Two specimens. Ciudad. 14. THOMOMYS TALPOIDES, Rich. Two specimens. Ciudad, July 24, 1881. The most southern locality yet recorded. 15. TATUSIA NOVEMCINCTA, Linn. One specimen. Ventanas, Sept. 14, 1881. 16. DIDELPHYS MURINA, Linn. Two specimens. Ventanas. The most northern locality recorded. i Mamm. N. Am. p. 266, pl. Ixv. 2 Mon. N.-Am. Eod. p. 735, 1877 8 Tom. cit. p. 812. |
