86 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Other plants collected are: 



Selaginella rupestris (Linnfeus) 

 Spring. 



Vsnea barhata (Linnaeus) Fries. 



'Nolina texana Watson. 



Nolina Undheimeriana (Scheele) Wat- 

 son. 



Dasylirion sp. 



Eriogonum cmspitosum Nuttall. 



Fendlera rupicola Engelmann and 

 Gray. 



Fonqtiieria splendens Engelmann. 

 Petela ialdwinii Torrey and Gray. 

 Cactus dasyacanthus Engelmann. 

 Cere-US rcemeri Muhlenpfort. 

 Opuntia (Platopuntia and Cylindro- 



piiniia, several species of each). 

 Garrya icrightii Torrey. 

 Anisacanthus thurierl Gray. 



Station No. 13.— Mosquito Springs, Chihuahua, Mexico. These 

 large springs, called " Ojos de los Mosquitos " by the Mexicans, and 

 commonly known as " Mesquite Springs" to the Americans, are 

 situated 2 kilometers (1.25 miles) east of Monument No. 46, at an alti- 

 tude of 1,270 meters (4,170 feet), in a broad valley between the Boca 

 Grande and Hachita mountains. They mark the western border of 

 the Eastern Desert Tract. The lowest part of the valley is a smooth 

 alkali flat, but the edges are covered with grass, mesquite, and shrub- 

 bery. As water is abundant, mammals and birds are plentiful in the 

 neighborhood of the springs. Mr. Holzner occupied this station 

 from May 10 to 18, 1892 ; the Avriter, May 15 to 18, and 19 to 21, 1892. 



The trees in the neighborhood are the desert yucca, devils claws, 

 mesquite, Kceierlinia, and desert willow. Cacti are abundant. 

 Among those seen were arborescent opuntias, prickly pears {Opun- 

 tia lindheimeri Engelmann, 0. -ftlifendula Engelmann, and others). 

 At the spring grew the aquatic Anemofsis californica (Nuttall) 

 Hooker and Arnott; the neighboring plains were covered, in places, 

 with the tapioca {Jntropha macrorrMza Bentham), and toward the 

 foothills, in which the " ocotillo," mimosas, acacia, and low yuccas 

 were abundant, were broad slopes occupied exclusively by the creo- 

 sote bush {Covillea tridentata) . Many flpwerin-" plants gave at- 

 tractiveness to the scenery. 



Station No. 14. — Lower Corner Monument (No. 53), at the east 

 end of the boundary parallel 31° 20', and the south end of meridian 

 108° 12' 30". (See Map, frontispiece.) Altitude, 1,408 meters (4,620 

 feet). Distance from the Rio Grande, measured on the Boundary 

 Line, 209 kilometers (130 miles). No camp was made here, but the 

 locality was frequently visited from a neighboring camp at Dog 

 Spring. The locality is of interest because of its proximity to Espia, 

 on the Corralitos Eiver, Chihuahua, where the naturalists of the old 

 Mexican Boundary Survey, under Major Emory, made valuable col- 

 lections in zoology and botany. The most abundant plants are the 

 Dasylirion^ Nolina, and cat's claws {Mimosa hiuncifera Bentham 

 and 31. lindheimeri Gray). Here we first saw the rainbow cactus 



