MAMMALS OF THE MEXICAN BOUNDARY 



REGION. 



Class MAMMALIA/' 



MAMMALS. 



Mammals are warm-l)loo(le(l vertebrates that suckle their youno;. 

 (They are usually covered Avith hair.) 



Subclass EUTHERIA. 



Youngs developed witliin the uterus from a minute egg which is 

 destitute of food-yolk; milk glands with nipples. 



Stiperordcr DIDELPHIA. 



Young born wlien of very small size and incomplete development, 

 never connected to the mother l)v a placenta : brain small ; its corpus 

 callosum rudimentary. 



« SUMMARY OF MAMMALS COLLPJCTED BY THE BIOLOGICAL SECTION 



OF THE INTERNATIONAL BOUNDARY COM:\rTSSION. IGNITED 



STATES AND MEXICO. 



The mammals collected by the writer, sei)aratel.v. and by himself and Ilolzner. 

 jointly, are nunil)ered consecutively from 14112 (Prromysciix. El Paso. Texas, 

 February 3, 1892) to 3829 (Uroci/oii IHtonilis. San Clemente Island, California, 

 August 28, 1894). 



At such times as Mr. Frank X. Ilolzner was separated from the writer he 

 kept his own register, beginning with No. 7."»9 {Peromyciis, San Pedro River. 

 Arizona. November 1, 1892), and ending with No. 16^5 {Procyoiu Pacific Ocean, 

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



Nearly all of the specimens were nieasui-ed by Doctor Mearns, excejtting Nos. 

 7r)9 to 1119 of Mr. Ilolzner's collection, which were measured by him. 

 Maunnals collected by Doctor Mearns and l)y Doctor Mearns and Mr. 



Holzner 2, 418 



Mammals collected by Mr. Frank X. Ilolzner 847 



^I'otal 3,2(55 



Sent by Mr. Ilolzner to the American ^Inseum of Natural History (al)out) _ 2.S3 



Total sent to the U. S. National Museum by :Mearns and Ilolzner — 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 Fort Clark, Texas, in 1897-98 3 



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



Specimens sent by F. 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 <552 



Shrews {XotioKorc.r .and Sorcx) sent by F. X. Ilolzner 2 



149 



