222 Recent Literature. [ZOE 
in the San Francisco Mountain region, four of boreal origin, and 
three of subtropical or mixed origin. (4) The correlation of the 
four boreal zones with corresponding zones in the North and East.” 
The theory of the distribution of animals, which is a most interesting 
and important field of zoological investigation, thus has new and 
unexpected light thrown upon it, which will change our views on this 
subject in its bearings upon North America, and probably the whole 
world. Although the other parts of the paper are of great interest 
they are not to be compared with the generalizations given in the 
first part. Part II gives an account of a brief visit to the Grand 
Cafion of the Colorado, with briefly annotated lists of the mammals 
and birds. Part III gives a list of the mammals of the San Francisco 
Mountain region, with full and interesting annotations on the habits 
and distribution of species and descriptions of many new forms. A 
valuable summary of the mammals of each zone on the mountain, 
closes the part. The new bat described from a single specimen 
must have been very strongly marked to have warranted making it 
a new species. Part IV is an annotated list of birds of the San Fran- 
_ cisco Mountain plateau and the desert of the Little Colorado River. 
The bulletin is illustrated with cuts of the skulls of new species of 
mammals and with maps showing life areas of the region visited and 
a provisional map of the faunal areas of North America. On the 
whole, Dr. Merriam deserves the highest credit for the energetic 
manner in which he conducted the survey, and for the valuable use 
he has made of his observations. CALK: 
Land Mammals of San Diego County, California, by F. STEPHENS. 
The West American Scientist, vol. vii, August, 1890. A briefly an- 
notated list of the mammals of this region. Local lists of mammals 
are quite rare, and as they are of great importance in determining 
faunal areas, they are always an addition to the literature on this 
subject. 
Contributions from the U. S. National Herbarium No. Il, By 
JoHN M Cou.ter. This is an account of the collection made by 
Mr. G. C. Nealley in the region of the Rio Grande in Texas. 903 
species are enumerated, the’ following new: 7) helypodium Vaseyi, 
Abutilon Nealleyi, Spheralcea subhastata, Pithecolobium Th CxeNse, 
Gaura Nealleyi, Aplopappus Nealleyi, Aplopappus Texanus, Vi- 
guiera longipes, Perityle Vaseyi, Ibomea Nealleyi, Ibomea Texana, 
