MAMMALS OF THE MEXICAN BOUNDAKY. 39 



PINUS CHIHUAHUANA Engelraann. 

 CHIHUAHUA PINE. 



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

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

 rosa, P. mayria7ia, or even P. arisonica, but slightly higher than the 

 pinon. Specimens were collected ,on both sides of the San Luis 

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

 On the east slope of the San Luis Mountains it was found from 1,850 

 to 2,070 meters (6,080 to 6,800 feet). On the west slope 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 2,075 meters (6,075 to 6,800 feet). In 

 Millers Canyon of the Huachuca Mountains the range of this species 

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

 grandidentatum and Pseudotsuga mucronata also begin, in the creek 

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

 Spring, the Chihuahua pine begins at 1,960 meters (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 Eange of California, where 

 it replaces P. 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, is wooded 

 with the Sabine pine. The altitude of this valley is 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; BIO CONE PINE. 



This remarkable pine, which bears cones of enormous size, was 

 found only along the crest of the Laguna Mountains, a spur of the 

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

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

 mountains, a few trees straggling into the highest notches. 



PSEUDOTSUGA MUCRONATA (Rafinesque) Sudworth. 

 DOUGLAS SPRUpE; RED FIR. 



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

 Life Zone on the San Luis, AnimaSj and Huachuca mountains, on all 

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



