222 - 
for the comple-tiqn of hatching, with the possible exception 0:^“ -M, femur- 
rubrum , AdulCM. ^ confusus are common and a few adult M, bivi'ttatus have 
• .been observed. About 50" P^^cent of the M, bivittatus and M«'~' 'packardii 
are in the fourth and fiftli 'instars. In the 'irrigated- areas these two 
species predominate,’ «nly a few M, mexicanus having-been observed. 
. Infestations- on range and idle land in Goshen and Campbell Counties were 
found to be composed of a mixture of different species with ■‘practically 
■ no M. mexicanus present, She severest general_ infestation is' in '• 
Sheridan County, where grasshoppers are present in numbers sufficient to 
do damage in practically all parts. of the county, - '• • " 
Utah, (J\ine 2»*S): Hatching was about 80 percent complete in most of the 
ipfested areas of the State, but at some of the higher elevations the 
hatch is just beginning,. The dominant species, mexicahtts , is' ‘ 
predominantly in the first and second instars; however, there is' a very 
wide range of development in the various areas of the State, Fifty 
percent of M. differentialis and M. bivittatus are in the third instar. 
Harvesting operations and rapid drying of idle and weedy areas'are 
causing a general movement into field margins, and .severe, marginal damage 
is now occurring in some alfalfa fields. Weather conditions during the 
last few weeks have been favorable for rapid development,'.. In. infested 
localities, populations average appro.ximately 20 per square yard-.-in 
fields and 100 per square* yard along field margins, 
G. F. Xnowlton and F, C, Harmston (May 3l)s “Heavy infestation of 
warrior grasshoppers (£. pellucida ) is developing in the Hayden area of 
the Uintah Basin, 
Montana, (June 2-S): Hatch , of M, mexicanus in north-central Montana is 
complete in manj'-' areas, with first to third instars reported in Fergus 
. and Chouteau ^Counties, Adult M, confusus appeared during the week in 
Fergus County, Some minor migrations took place ‘during the week, but 
cool weather has prevented any heavs.' movement, (June 9-15) • 'M; mexicanu s 
..-constitutes about 9.8 percent of the infestation in Hill County, A few 
V 'M* bivittatus and miscellaneous range species have been"noted,'^ In Toole, 
Chouteau, Judith Basin, and in parts of, Cascade, Teton, Liberty ,-^and Hill 
b'; ■ Cbuiitiesvthe hatch is completed, (June 16 to 22): Adult lU mex icanus 
■ r, have been observed ..In Fergus, Cascade, Chouteau, Pondera, and hill 
Counties and ’/5 perce.ntare recorded as 'being in the fifth 'instars The 
northeastern counties" -of Dawson, McCon^V Richland, 'Roosevelt, Cheridan, 
, and Dmiiels have very light infestations, the heaviest being in Rich- 
Isjid wiiero I5 grasshoppers to the sq-uef-e yard were .found.. It is reported 
thp.t the hatch is complete in this latter section, ■ In Liberty County, 
about . 50 percent of the M. .nexica.nus are now in the fourth instar. 
South Dako pa, (June 2-8): M. dif fere ntia lis reported to* be hatching rspidly 
.. ..in the eastern, part of the State-. The hatch of M,. bivitv.atus and 
- . M.* me.xicanus -'ip. the, same secfipn cf' the- State- was repci-'tci to be almost 
■ \ -e-"bmplete', - in the Black- -Hills -arehy in the western' part of the State, 
: . infestation’s''- remain* spotted, M.’ . mexic-anus ' reprose-nti-'ng -about - 85 percent 
of the total populations," Th'e hatch -i’S prWct'i'b ally completed in- this 
area, M, confusus adults are common and M, differentialis is in the 
