EXPLANATION OF THE ILLUSTRATION 
Prare XLI. (Upper fig.). Plains of San Augustin, 
New Mexico. Numerous clumps of saltbush (4tri- 
plex canescens) thinly interspersed with grasses and 
a few herbaceous plants. In the middle foreground 
is the large playa in front of Bat Cave. Elevation 
about 6500 feet. 
(Lower fig.). Juniper (left) and pifion on the hills 
directly above Bat Cave at an elevation of about 
7000 feet. Ground cover here is heavier with 
grasses, herbaceous plants, and cacti. 
