38 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



PINUS TORREYANA Parry. 

 TORREY PINE. 



This pine is confined to certain of the Santa Barbara Islands, off 

 the coast of southern California, and to a small area on the mainland 

 a few miles north of San Diego Bay. 



PINUS ARIZONICA Engelmann. 

 ARIZONA PINE. 



I found this tree on the north side of the San Jose Mountains, 

 Sonora, between 2,130 and 2,440 meters (7,000 to 8,000 feet) altitude, 

 occupying the lower portion of the Pinus ponderosa zone. It appears 

 to have the same range on the east side of the Huachuca Mountains, 

 where, in company with Maj. Timothy E. Wilcox, I collected speci- 

 mens on the peak known as Nigger Head, at 2,160 meters (7,100 feet), 

 in July, 1893. It also occurs in the same zone on the Chiricahua and 

 Mogollon mountains of Arizona. The specimens from San Jose 

 Mountains were identified by Prof. Charles S. Sargent. 



PINUS PONDEROSA Lawson. 

 BULL PINE, 



In proceeding westward the bull pine was first seen on the summit 

 of Animas Peak (altitude 2,077 meters, or 8,783 feet), in southwestern 

 NeAv Mexico. It was subsequently found in abundance on the San 

 Jose Mountains, in Sonora, and in the Huachucas of Arizona, where 

 it ranges from 2,130 meters (7,000 feet) upAvard. Specimens from 

 each of the above localities were identified by Prof. Charles S. Sar- 

 gent. This handsome pine (Plate III, fig. 1) is from 25 to 50 meters 

 (80 to 165 feet) in height. It marks the extent of the so-called 

 Transition Life Zone, which in the east is occupied by the Alleghanian 

 fauna. On the Mexican line its ascertained vertical range is from 

 1,890 meters, or 6,200 feet (San Jose Mountains, Sonora), up to 2,590 

 meters, or 8,500 feet (Huachuca Mountains, Arizona). 



PINUS MAYRIANA Sudworth. 

 MAYR PINE; ARIZONA BROAD LEAF PINE. 



This stately tree grows rather sparingly on both sides of the San 

 Luis range of mountains, from the highest slopes down, in canyons 

 only, to the base of the mountains. Specimens from these mountains 

 were identified by Prof. Charles S. Sargent. Maj. Timothy E. Wil- 

 cox collected specimens of the Mayr pine in the Huachuca Moun- 

 tains, which were included in the list prepared by Messrs. Britton 

 and Kearney. 



