MAMMALS OF THE MEXICAN BOUNDARY. 



97 



326 kilometers (202 miles). A hilly region, covered with volcanic 

 scoria, sparsely clothed with grass and brushwood, with a few red 

 juniper trees. Within a radius of a dozen kilometers (7 miles) a 

 range of altitude from 1.200 to L,640 kilometers (3,940 to 5,380 feet) 

 could be found. Station occupied by myself September 1 and 11, 

 L892; August 11 to 17: and October 7. L893. Plants, birds, etc. were 

 collected. 



blunt of Gerro Gallardo. — The trees and plants obtained near this 

 station are named in the following lists. 



The trees are : 

 Juniperus monosperma l Engelmann) 



Sargent. 

 Yucca brevifolia Torrey. 

 Salix taxifolia Humboldt. Bonpland, 



and Kunth. 

 Quercus arizonica Sargent. 

 Celtis reticulata Torrey. 

 Worus celtidifolia Humboldt. Bon- 

 pland. and Kunth. 

 Platanus wrightii Watson. 



Icacia constricta Bentham. 

 Acacia greggii Gray. 

 Prosopis sp. 



Eysenhardtia orthocarpa (Gray) Wat- 

 son. 

 Kceberlinia spinosa Zuccarini. 

 Sapindus marginatum Willdenow. 

 Bumelia rigida (Gray) Small. 

 Fraxinus velutina Torrey. 



Other shrubs and conspicuous plants are 



Ephedra trifurca Torrey. 



Yucca haccata Torrey. 



Nolina lindheimeriana (Scheele) Wat- 

 son. 



Dasylirion wheeleri Watson. 



Agave pal inert Engelmann. 



GucurMta foetidissima Humboldt, Bon- 

 pland. and Kunth. 



Cucurbita digitata Gray. 



Apodanthera undulata Gray. 



Mimosa biuncifera Bentham. 



Mimosa lindheimeri Gray. 



Mimosa dysocarpa Bentham. 



Tre- 



Mimosa grahami Gray. 



Acacia filiculoides (Cavanilles) 



lease. 

 cassia wislizeni Cray. 

 Erythrina flabelliformis Kearney. 

 Krameria parvifolia Bentham. 

 Fouquieria splendens Engelmann. 

 Covillea tridentata (de Candolle) 



Vail. 

 Rhus virens Lindheimer. 

 Opuntia of subgenera Platopuntia and 



Cylindropuntia. 

 Baccharis glutinosa Persoon. 



Station No. 28. — Agua Prieta Ranch, Piedras Nfegras, Sulphur 

 Spring Valley. Monument No. 85, distant from the Rio Grande 

 338 kilometers (210 miles). Altitude, 1.204 meters (3,950 feet). 

 Occupied by myself September 11 and 12, 1892; August 14: and Octo- 

 ber 7. 1803; by Mr. Holzner, September 11 to 12. L892. This broad 

 valley, though crossed several times, was not carefully examined, and 

 the collections made were small. 



Vegetation. — The ground is part bare and part grassy, with exten- 

 sive patches of the gregarious creosote bu-li (Coeillcii trident, itn). 



and considerable greasewood (Atriplex), with some cacti. Soapweed 

 ( Yucca glauca) and a narrow-leaved yucca having a long caudex 

 were sometimes seen; and some superb hackberry trees formed a 

 grove on an arroyo at the west side of Sulphur Spring Valley, at 

 30639 — No. 56—07 m 7 



