MAMMALS OF THE MEXICAN BOUNDAEY. 41 



CUPRESSUS ARIZONICA Greene. 

 ARIZONA CYPRESS. 



This species of cypress is abundant on both 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 River, 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 (5,650 feet) altitude. Tn 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 -S feet) in diameter. 



JUNIPERUS MONOSPERMA (Engelmann) Sargent. 

 ONE SEED JUNIPER, 



This juniper belongs to the upper Sonoran Life Zone. The ex- 

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

 Boundary, is from 1,260 to 1,868 meters (4,134 to 6,129 feet) . 



The first juniper was met with on the rocky rim of a, volcanic crater 

 south of Monuments Nos. 8 and 9 of the Mexican Boundary Line. 

 Only two trees were seen at this place, which has an altitude of 1,260 

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

 Carrizalillo Mountains were reached. These mountains rise from 

 1,270 to 2,295 meters (4,167 to 7,530 feet), and are sparsely wooded 

 with this juniper, which 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 Mexico. On the 

 Dog Mountains the one-seed juniper ranges from 1,500 to 1,868 

 meters (4,922 to 6,129 feet), its range being about coextensive witli 

 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 was not seen on the east or west side of the San Luis 

 Mountains, because the base-level is too high ; but it was 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 1,676 

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

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



