include several important forage plants; for example, various species of
_Bouteloua_ and _Aristida_, with _B. rothrockii_ (crowfoot grama) the
most important. Accessibility and abundance of different plants have
much to do with the kinds of storage found.

(7) The dens of _spectabilis_ are the most notable of all kangaroo rat
dwelling places. They range from 6 inches to 4 feet in vertical height,
and from 5 to 15 feet in diameter. Here the kangaroo rat has its home,
shelter, and food-storage chambers. Within the den is found a tortuous
network of burrows, with many storage and some nest chambers, the whole
arranged so as to be two to four stories high.

(8) _Dipodomys s. spectabilis_ is not of great economic significance,
except locally, in ordinary seasons. During periods of extreme drought
it may be of critical importance on grazing areas from the standpoint of
the carrying capacity of the range.

(9) Kangaroo rats are easy to poison by following the same formula as
that used by the Biological Survey for destroying prairie dogs.

(10) In many places unsuited to extensive grazing or agriculture
_spectabilis_ does no appreciable damage. It is one of the most
interesting of all the rodents peculiar to our Southwestern deserts, and
should not be molested except where it is destructive.




BIBLIOGRAPHY.