MAMMALS OF THE MEXICAN BOUNDABY. 89 



Station No. 17 — Eastern base of the San Luis Mountains. Mon- 

 ument No. 64 marks the lower timber line on the San Luis Mountains, 

 which is the largest range crossed by the Mexican Boundary Line, 

 and practically continuous with the Sierra Madre of Mexico. The 

 monument is 255 kilometers (159 miles) from the Rio' Grande, and 

 has an elevation of 1,620 meters (5,315 feet), the highest neighboring 

 peaks reaching 2,400 meters (7,874 feet), while Animas Peak, at 

 the north extremity of the San Luis Range in New Mexico, is 2,677 

 meters (^,783 feet) in height. The forest trees at the lower timber 

 line are mostly evergreen oak {Quercus emoryi), though there are 

 cypress, walnut, cherry, sycamore, and gray oak {Quercus grisea) 

 in the low canyons. The open country below the timber line is cov- 

 ered with grass, with occasional areas of mesquite and chaparral. 

 This station was visited by me on June 2, 17, and 29, 1892, and I also 

 camped there September 23 to 24, 1893. 



Station No. 18. — San Francisco Canyon, east side of San Luis 

 Mountains, Chihuahua, Mexico. The camp was about 8 kilometers 

 (5 miles) southwest of Monument No. 63, in the West Playas Valley. 

 .Altitude of station, 1,800 meters (5,906 feet). It was in a wooded 

 canyon, beside a stream (San -Francisco Water) that arises amid the 

 high peaks of the San Luis, and was surrounded by cypress and other 

 trees. The station was occupied by me from June 18 to 19 and 22 

 to 27, 1892; September 11, 1893. Mr. Holzner was there from June 

 22 to 27, 1892. Valuable collections were made here, as many of the 

 species obtained belong to the Mexican fauna and flora, only crossing 

 the United States line at a few points. The neighboring summits 

 of the San Luis Mountains were visited from this camp. 



Station No. 19. — Summit of the San Luis Mountains. Monument 

 No. 65 stands on the highest point crossed by the Boundary Line. It 

 is 261 kilometers (162 miles) from the Rio Grande. The altitude at 

 the monument is but 2,048 meters (6,719 feet) ; but n,eighboring peaks 

 on the south are from 2,000 to 2,400 meters (6,562 to 7,874 feet), 

 while the main Animas Peak, 29 kilometers (18 miles) to the- north, 

 reaches the height of 2,677' meters (8,783 feet). 



The naturalists of Major Emory's survey of the Mexican Bound- 

 ary Line usually referred to the San Luis and Animas peaks as the 

 Sierra Madre, of which system they are in reality the most northern 

 spur. They are to be regarded as the western border or rim of a 

 canoe-shaped continental divide, the Quitman Range forming the 

 eastern rim, and the Eastern Desert occupying the interior of the 

 canoe, where it is cross sectioned by the Boundary Line. At the time 

 that this survey was made a small band of Apaches, under a renegade 

 Indian scout named Kid, frequented these mountains and terrorized 

 the settlers of the surrounding country. Some of these Indians were 

 twice seen in 1893 by members of our party, and their tracks were 



