-326- 
Idaho 
1. Melanoplus mexicanus 
2, Melanoplus bivittatus 
3« Cannula peilucida 
Colorado- 
1. Mela nop lu s differentia lis 
2# Melanoplus mexicanus 
3« Melanoplus femur-rubrum 
Kansas 
1* Melanoplus differentiali s 
2# Melanoplus bi vittatus 
3» Melanoplus mexicanus 
Nevada 
1. Melanoplus mexicanus 
^* C amnnl a peilucida 
3» Melanoplus bi vittatus 
' Utah 
1« Camnule peilucida 
2. Melanoplus mexicanus 
3« Melanoplus femur -rub rum 
4. Melanoplus p ackardii 
5» Melanoplus bivittatus 
b» Aulocara elliotti 
Oregon 
1 . Cannul a p eiluci da 
2. Melanoplus iemur-rubrum 
3» Me lanoplus bivittatu s " 
4« Melanoplus mexicanus 
DISCUSSION 
The survey indicates that Melanoplus mexicanus was the most widespread 
and destructive to crops of all the grasshopper species concerned in the out- 
break. Cannula pei l ucida came next. Even on the grazing lands, both these 
apecies were of great importance. C_. peilucida occurred in greatest abundance 
at higher elevations or in more northern latitudes. Two other species, 
Melanoplus bivittatus end M. d ifferentialis , very important in past outbreaks, 
have all but disappeared in the areas of heavy drought. These two species 
began building up in 1928 in the States of North and Souta Dakota, and reached 
their peek of abundance and widespread destruction in the outbreaks of 133^ 
and 193^» During these years weather conditions, although somewhat hot and 
