MAMMALS OF THE MEXICAN BOUNDARY. 39 



PINUS CHIHUAHUANA Engelmann. 

 CHIHUAHUA PINE. 



This is a medium-sized pine aboul the size of Pinus rigida of the 

 eastern United State-. Its range is lower than that of Pinus ponde- 

 rosa. I', mayriana, or even P. arizonica, hut slightly higher than the 

 pinon. Specimens were collected on both side- of the San Luis 

 Range, and on the Guadalupe, San Jose, and Iluachuca mountains. 

 On the east slope of the San Luis Mountains it was found from L,850 

 to 2,070 meters (6,080 to 6,800 feet ). On the wesl -lope it was found 

 as low as 1,815 meters (5,950 feet). At the point where the Boundary 

 Line crosses the San Luis Mountains, this species ranges in altitude 

 on the east side from 1,850 to -2.07:) meters (6,075 to 6,800 feet ). In 

 Miller- Canyon of the Iluachuca Mountains the range of tlii- species 

 begins at 1,830 meters (6,000 feet), at which point Acer saccharum 

 grandidentatum and Pseudotsuga mueronata also begin, in the creek 

 bed. On the northeast side of the San Jose Mountains, above t rallina 

 Spring, the Chihuahua pine begins at 1,960 meter- (6,425 feet) and 

 extends up to 2,110 meters (6,925 feet). 



PINUS SABINIANA Douglas. 

 SABINE PINE; GRAY PINE. 



This is the common pine of the Coast Range of California, where 

 it replaces /'. ponderosa of the interior; and, like that species, it is 

 a tree of the Transition Zone. Pine Valley, a basin nestling among 

 the foothills of the Laguna Mountains, east of San Diego, i> wooded 

 with the Sabine pine. The altitude of this valley i- about 1,300 

 meters (4,300 feet). The seeds of the large cones are much sought 

 by squirrels and birds. 



PINUS COULTERI Lambert. 

 COULTER PINE; BIG CONE PINE. 



This remarkable pine, which hears cone- of enormous size, was 

 found only along- the crest of the Laguna Mountain-, a spur of the 

 Coast Range, in California. Its range appeared to he restricted to 

 a narrow belt close to the summit on the deserl (east) side of the 

 mountains, a few tree- straggling into the highest notches. 



PSEUDOTSUGA MUCRONATA (Rafinesque) Sudworth. 

 DOUGLAS SPRUCE; RED FIR. 



This was the most abundant tree of (lie Canadian or Lower Boreal 

 Life Zone on the San Luis, Animas, and Iluachuca mountain-, on all 

 of which it reaches the summits. In cold, wet ravines it sometimes 



