MAMMALS OF THE MEXICAN BOUNDARY. 41 



CUPRESSUS ARIZONICA Greene. 

 ARIZONA CYPRESS. 



This species of cypress is abundant on l)oth sides of the San Luis 

 Mountains and on the Animas Mountains north of them. It was 

 not seen elsewhere on the Boundary, though careful search was made 

 for it on the San Jose and Huachuca mountains. In Yavapai 

 County, Arizona, it forms brakes which cover extensive areas on the 

 hill slopes bordering the headwaters of the Verde Kiver, notably on 

 Pine and Oak creeks. In the San Francisco Canyon, on the east 

 side of the San Luis Mountains, in Chihuahua, this tree was found as 

 low as 1,720 meters (5,050 feet) altitude. In Turkey Canyon, on the 

 west side of the San Luis Mountains, it was not seen lower than 

 1,780 meters (5,850 feet). It reaches the summit of these mountains. 

 It is a handsome tree with reddish bark, 12 to 40 meters (40 to 125 

 feet) in height and .3 to 1 meter (1 to 3 feet) in diameter. 



JUNIPERUS MONOSPERMA (Engelmann) Sargent. 

 ONE SEED JUNIPER. 



This juniper belongs to tlie u])per Sonoran Life Zone. The ex- 

 treme vertical range of this species, as determined by me on the 

 Boundary, is from 1,200 to 1,808 meters (4,134 to 0,12!) feet). 



The first juni])er was met with on the rocky rim of a volcanic crater 

 south of Monuments Nos. 8 and of the Mexican Boundary Line. 

 Only two trees were seen at this place, which has an altitude of 1,200 

 meters (4,134 feet). AVe did not meet with junipers again until the 

 Carrizalillo Mountains were reached. These mountains rise from 

 1,270 to 2,295 meters (4,107 to 7,530 feet), and are sparsely wooded 

 with this juniper, VNhich is also common in the Apache Mountains 

 around Monument No. 40 (altitude of monument, 1,494 meters, or 

 4,902 feet). The "cedar" was also common on the Big and Little 

 Hatchet and Dog mountains in Grant County, New jSIexico. On the 

 Dog Mountains the one-seed juniper ranges from 1,500 to 1,808 

 meters (4,922 to 0,129 feet), its range being about coextensive with 

 that of Quercus emoryi^ practically ending with that species at 1,753 

 meters (5,750 feet) altitude, though a few trees straggle to the 

 summit. 



This tree w^as not seen on the east or west side of the San Luis 

 Mountains, because the base-level is too high ; but it Avas common on 

 the southern and southwestern slopes of these mountains, in the Mexi- 

 can notch between the Sierra Madre and San Luis ranges. 



In Guadalupe Canyon the highest tree was at the altitude of 1,070 

 meters (5,500 feet), the lowest in the neighboring San Bernardino 

 Valley to the westward being at 1,280 meters (4,200 feet). 



