JAMES A. G. REHN 
195 
The species is known only from the Spring Mountains of 
southern Nevada, an isolated mountain mass which rises from 
the surrounding desert valkws, i. e. Indian Spring on the north, 
Las Vegas on the northeast and east, Mesquite and Ivanpah on 
the south, Pahrump on the southwest and the Amargosa Desert 
on the west. The general lev(>l of these valleys is two thousand 
to three thousand, fivehundi'ed h'et al)ove sea-level, and thesuin- 
mit of Charleston P(>ak, the culminating point of the Sjiring 
^Mountains, reaches elevcm thousand, nine hundred feet. Ascend- 
ing from the northeast, up L('e Canyon, hy way of an old traction 
road over which timlx'r had been hauled from a now abandoned 
saw-mill, we first encountered the present species of oedipodid 
at seven thousand feet, in a park-like region of juniper and pin- 
yon, where on ])are spots with broken stony soil, often with dry 
scattei'ed grass and low herbage, it was uncommon. From this 
(‘l(‘vation up it increased in local abundance. .\t eight thousand 
to (‘ight thousand, five hundred feet in very dry open forest of 
W('st('rn yellow i)ine, some douglas fir and western white piiu', 
the insect was moderately numerous, preferably on bare surfac(‘s 
with pebbles and large fragments of the blue gray limestone of 
which these mountains are largely composetl. Whih* a pow('r- 
ful flier, crutdliu)! is not easy to ca])tur(' chiefly for anotlu'r reason, 
as, while not particularly wary, it has a crouching habit- wliich 
permits a net to pass over it before, rising safely, it rattles off. It 
clatters much like menil)ers of the Pabula Ci'oup, but not quiti' 
so loudly, and in flight seldom rises more than a dozen h'et, appar- 
ently not performing the aerial l)allet of C. undidatm (/o/xha.sof 
authors). As high as ten thousand, two hundred feet on the very 
steep and rocky slope's of Charleston Peak, cre/a/a/n wasfound, 
although there Imt a single colony, and this largely made up of 
immature individuals, was located on August 19. 
Doubtless this insect occurs at suitable elevations and in ])ro- 
per environments on other ranges in southern Nc'vaela, and pi'o- 
bably ailjacent dese'rt ranges in C'alifornia, l)ut we are' without 
deflidte peesitive infe)rmation, altlie)ugh ne'gative evide'iu'c, from 
our e)wn observations, is available' freem cei’tain localitie's in that 
general region. 
TK.W^. A.M. ENT. SOC., XI.VII. 
