MAMMALS OF THE MEXICAN BOUNDARY. . r >.'-> 



2,133 meters (7,000 feet) this oak was reduced to a shrub, having 

 spiny angled instead of mostly entire leaves. 



On the Sail Luis Mountain- this tree was not met with on the main 

 ridge north of Turkey Canyon below the altitude of 2,240 meters 

 (7.-". K) feet), and only spiny-leaved shrubs were -ecu: !»ut in Turkey 

 Canyon trees were found as low as 2,133 meters (7,000 feet), having 

 mostly entire leaves and ranging from 6 to 9 meter- (20 to 30 feet) in 

 height. The hark is usually rather smooth and blackish gray. The 

 acorn cups are very characteristic. 



In the Canelo Hills, between the Huachuca Mountains and the 

 Santa Cruz River, two handsome tree- were seen. It was also found 

 on the highest peaks of the Coast Range Mountains, in California. 



QUERCUS AGRIFOLIA Nee. " 

 CALIFORNIA LIVE OAK. 



A tall, handsome tree, bearing boat-shaped evergreen loaves. It 

 is the common oak tree of the low valleys of the Pacific Coast Tract. 

 We did not observe it on the east slope of the Coast Range Moun- 

 tains, though it appeared as soon as the divide was crossed, in the 

 vicinity of Jacumba Hot Springs. It again disappeared in the low 

 country bordering the Pacific Ocean, where it is replaced by the 

 scrub oak {Quercus dumosa). In San Diego County. California, 

 this tree sometimes reaches the height of -23 to 30 meters (75 to 100 

 feet), with the trunk 0.5 to 1.5 meters (2 to 5 feet) in diameter, 

 i Plate VII, fig. 1.) 



QUERCUS HYPOLEUCA Engelmann. 

 WHITELEAF OAK. 



A handsome evergreen oak. with medium-sized leathery leave- 

 covered on the under surface with whitish tomentum. It is usually 

 a small or medium-sized tree, but near the lower spring in Turkey 

 Canyon of the San Luis Mountain are several tree- that reach nearly 

 :')() meter- ( 100 feet) in height, with straight trunk- 1 meter (about :', 

 feet) in diameter. At the highest spring on the north side of the 

 San Jose Mountains at 2.-_'!>7 meter- (7,250 feet) altitude i- a while 

 leaf oak measuring 23 meter- (75 feet) in height by 0.67 meter 

 (2 feet) in diameter. (Plate VII, fig. 2.) 



The extreme vertical range of this oak i> from 1.775 meter- or 

 5,825 feet (Turkey Canyon. San Luis Mountain-. Chihuahua) to 

 2,877 meters or 9,440 feet (summit of Animas Peak. New Mexico). 

 As in the case of other species of oak. it become- a shrub on the 

 mountain summit-. On the east side of the San Luis Mountain- the 

 lowest were noted at L,865 meters (6,120 feel): on the west side at 

 1,775 meters (5,825 feet). In Millers Canyon of the Huachuca 



