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(district 2). The great hordes of these grasshoppers have disappeared over 
the greater part of the State. Melanoplus differentialis was abundant, how- 
ever, in the southeastern 'district (district 2) in corn and weedy pastures 
and along roadsides. It comprised from 29 to 49 percent of the total num- 
ber of grasshoppers collected in these habitats. Over most of the State 
Ageneotettix deorum was much more abundant than either M. differentialis or 
M. bivittatus , ranking next to M. mexicenus . Melanoplus peckardii was 
fairly numerous and generally distributed. Camnula pellucida occurred in 
the northeastern district (district 1) and at the first of the season was 
abundant and dominant in the western (district "4)' or mountain areas. Vigor- 
ous control measures reduced its numbers by 80 percent in most of the western 
area. Melanoplus femur-rubrum did not occur abundantly and was found mostly 
in alfalfa. ' 
In the grasslands, Ageneotettix deorum , Mestobregma kiowa , Phlibostroma 
quadrimaculatum . and Drepanopterna femoratum Scudd. were most abundant. 
Melanoplus mexicanus was numerous in the central portion and Camnula 
pellucida was dominant in the low-mountain grassland. Mestobregma kiowa was 
dominant in the native sod pastures 1 , making up from 41 . to 5# percent of the 
total population. In pastures suffering from severe drought, where -the grass 
was burned up and overgrazed, this -species was fairly abundant (8 per square 
yard) even though the foliage seemed insufficient to support the most meager 
population. M. kiov/a has been called the pasture grasshopper and is rightly 
named. 
In the thousands, of. acres of Russien-thistle M. mexicanus was by far 
the most abundant species, constituting from 43 ^ 67 'percent of the total 
grasshopper population. The next in abuncianoe here, was ageneotettix deorum 
making up from 4 "to 10 percent. * 
* * 
Y/yoming 
In small grains Melanoplus mexicanus was dominant at l8 percent; fol- 
lowed closely by .ageneotettix deorum , at 15 percent; M. bivittatus- >13 percent| 
M. f emur-rubrum , 11 percent; and Aulocara elliotti Thos.,11 percent. Earlier 
in the season, Camnul a pellucida was '"" abundant, especially in the north- 
er stern part. There was a terrific slaughter of this particular species, 
together with M. mexicanus and M. bivittatus , in the poisoned-bait campaigns. 
Observers recorded, time and again, the finding of countless numbers of dead 
grasshoppers on the ground. This disturbed the normal balance for the dif- 
ferent species here, as well as in all other districts where intensive control 
measures had been in force. 
Alfalfa is an important forage crop in Wyoming. Melanoplus mexicanus 
was the species most numerous in this crop at 31 percent in the eastern dis- 
trict (district 1), and M. femu r- rubrum- at 37 percent was dominant in the 
western district (district 2), Ageneotettix deorum ranked next, at 13 per- 
cent in the eastern part, and M. packsrdii at 22 percent in the western part. 
Camnula pellucida formed about 2 percent. of the population in the eastern part 
end jumped to 13 percent in the western district. 
Wyoming is an important stock-raising State, and large grazing areas 
