MAMMALS OF THE MEXICAJST BOUNDAHY. 93 



San Luis Springs from May 31 to June 2, 1892. Thougli a purely 

 business trip, occupying five days, made for the purpose of locating 

 future camping grounds with the view to a supply of wood, water, 

 and grass, game was so abundant that we killed seven antel-ope, two 

 deer, two turkeys, two black timber wolves, and smaller game. 



This station was occupied by me from May 31 to June 2, June 29 

 to July 1, July 4 to 16 and 18 to 28, 1892 ; August 31 to September 

 10, September 24 to October 2, 1893. Mr. Holzner was there from 

 June 29 to July 11 and July 23 to 28, 1892. Collections were made 

 in other parts of the Animas Valley and in the San Luis Mountains, 

 as well as about the camp. 



Station No. 21. — Head of Right Fork of Cajon Bonito Creek. 

 This beautiful stream rises from springs at the side of a wooded 

 canyon, at an altitude of about 1,3T5 meters (4,511 feet) 6 miles 

 south of Monument No. 67. It constitutes one of the ultimate sources 

 of the great Yaqui River of western Mexico. Collections of fishes, 

 birds, mammals, plants, etc., were made by me from July 1 to 4, 21, 

 and 23 to 24, 1892 ; September 8 and 27 to 28, 1893. The fauna and 

 flora are largely Mexican. The fish are, of course, those of the 

 Yaqui River. The Texas kingfisher, Mexican cliff swallow, and 

 many other interesting species of the Mexican fauna were obtained. 

 On the middle course of Cajon Bonito Creek, which is parallel to 

 Guadalupe Canyon, in the vicinity of Monument No. 73, are numerous 

 siliceous tree trunks, some of them delicately colored, but which 

 crumble to pieces when struck by the hammer. 



Vegetation. — In reaching the head of the Right Fork of Cajon 

 Bonito Creek, the west foot of the San Luis Mountains is skirted 

 from Lang's ranch to the south edge of the Animas Valley, crossing 

 several points of oak timber — prolongations down shallow washes 

 or canyons from the general timber line of the mountains. Tall 

 nolinas cover much of this part of the Animas Valley. Numerous 

 ravines extending from it to the Cajon canyon are wooded near the 

 tops with oaks and alligator juniper, mixed lower down with one- 

 seed juniper, sycamore, hackberry, walnut, wild china, desert willow, 

 ash, mulberry and acacia, with an undergrowth of shrubs, yuccas, 

 prickly pears, choya cacti, mescal, and nolinas. At the head of the 

 stream are springs of rather warm water, and there are hot springs 

 lower down, on the main Cajon Bonito Creek. The banks are forested 

 with Cottonwood, sycamore, maple, willows {Salix nigra, S. occidenta- 

 lis longipes, and S.' taxi folia), ash, mulberry, desert willow, cherry, 

 walnut, and wild china, with here and there an alligator juniper, a 

 one-seed juniper, or even a straggling Arizona cypress. The rocky 

 acclivities support a growth of grapevines {Vitis arisonica Engel- 

 mann) and poison ivy {Rhus toxicodendron Linnaeus), intermixed 

 with cacti, mescal, dasylirions, yuccas, nolinas, shrubby sumachs, 



