MAMMALS OF THE MEXICAN BOUNDARY. 55 



New Mexico, and on the plain near Alamo Hueco Spring, several 

 remarkably large specimens were observed growing beside a dry 

 arroyo. In descending through Guadalupe Canyon, from the high 

 Ajiimas Valley, the first hackberries were mel with at the altitude 

 of 1,481 meters (4,860 feet). A photograph of one was made at 

 1,493 meters (4,800 feet). It is of frequent occurrence on the upper 

 course of the San Bernardino River. On the western -lope of the 

 Sulphur Spring Valley, at the altitude of 1,402 meters | 1,600 feet ). a 

 superb arm'*' of hackberry trees occupies the bed of a dry water- 

 course. It is common in ravines of the Mule. Eluachuca, and Pata- 

 gonia mountains, as well as throughout the upper Santa Cruz Valley. 

 None of the largest specimens was measured; hut I should roughly 

 estimate their size at about 1 meter (3 feet) in diameter by 15 meters 

 (50 feet) in height. The altitudinal range of this species is from 975 

 meters, or o. •_!(><) feet (on the San Bernardino River near the mouth of 

 Cajon Bonito Creek), to 1.700 meters, or 5,578 feet ( Bisbee, Arizona). 



CELTIS RETICULATA Torrey. 

 PALO BLANCO. 



This tree was collected at Monument No. 90, Mexican Boundary 

 Line, south of Bisbee, Arizona. It has been recorded by Dr. X. L. 

 Britton as among - the collections sent in by Maj. Timothy E. Wilcox 

 from the Huachuca Mountains, Arizona. As observed by us, it is a 

 small tree in arroyos, below the general timber line. T did not meet 

 with it, to the eastward, beyond the headwaters of the Rio Yaqui. 



CELTIS MISSISSIPPIENSIS Bosc. 

 SUGARBERRY. 



A common tree at Fort Clark, Kinney County. Texas: also on the 

 Devils River, Texas. 



MORUS RUBRA Linnaeus. 

 RED MULBERRY. 



Texas, east of the Devils River. Las Moras Creek, at Fort Clark, 

 in Kinney County, received its name from the former abundance of 

 this tree on its banks. At present it is scarce there, only a few small 

 trees having been observed by us. but we were fortunate in obtaining 

 a specimen. 



MORUS CELTIDIFOLIA Humboldt, Bonpland, and Kunth. 

 MEXICAN MULBERRY. 



This mulberry was first -ecu in the Dog Mountains. There are 

 some line ones at Dog Spring, which, we were informed, were the 

 only trees around the spring when the ranch was first established. 



