MAMMALS OF THE MEXICAN BOUNDARY 



REGION. 



Class MAMMALIA." 



HAMMALS. 



Mammals are warm-blooded vertebrates that suckle their young. 

 (They are usually covered with hair.) 



StalDclass EUTHERIA. 



Young developed within the uterus from a minute egg which is 

 destitute of food-yolk ; milk glands with nipples. 



Superorder DIDELPHIA. 



Young born when of very small size and incomplete development, 

 never connected to the mother by a placenta ; brain small ; its corpus 

 callosum rudimentary. 



" SUMMARY OP MAMMALS COLLECTED BY THE BIOLOGICAL SECTION 



OP THE INTERNATIONAL BOUNDARY COMMISSION, UNITED 



STATES AND MEXICO. 



The mammals collected by the writer, separately, and by himself and Holzner, 

 jointly, are numbered consecutively from 1412 (Peroniyscus, El Paso, Texas, 

 February 3, 1892) to .3829 (Urocyon littoralix/Saa Clemente Island, California, 

 August -28, 1894). 



At such times as Mr. Prank X. Holzner was separated from the writer he 

 kept his own register, beginning with No. 759 (Peromycus, San Pedro River, 

 Arizona, November 1, 1892), and ending with No. 1605 {Procyon, Pacific Ocean, 

 at mouth of Tijuana River, California, July 10, 1894). 



Nearly all of the specimens were measured by Doctor Mearns, excepting Nos. 

 7.59 to 1119 of Mr. Ilolzner's collection, which were measured by him. 

 Mammals collected by Doctor Mearns and by Doctor Mearns and Mv. 



Holzner 2, 418 



Mammals collected by Mr. Frank X. Holzner 847 



Total 3, 265 



Sent by Mr. Holzner to the American Museum of Natural History (about) _ 233 



Total sent to the U. S. National Museum by Mearns and Holzner 3, 032 



Specimens subsequently registered at the U. S. National Museum 15 



Doctor Mearns's collection made at Fort Clark, Texas, in 1897-98 111 



Louis Mearns's collection made at Port Clark, Texas, in 1897-98 3 



Specmens sent by A. W. Anthony from San Clemente Island 45 



Specimens sent by P. X. Holzner from San Diego, June 1, 1895 68 



Specimens sent by F. X. Holzner from San Diego, October 1, 1895 55 



Specimens collected by Doctor Mearns in Arizona and New Mexico, 



1884^1888 G52 



Shrews {Notiosorex and Sorex) sent by F. X. Holzner 2 



149 



