TWENTY-SIXTH REPORT OF STATE ENTOMOLOGIST 11 



seem to make their start. (2) By use of a less expensive pois- 

 oned bait during the development of an outbreak and even at 

 its height. 



The Prevention Idea in Range Grasshopper Control 



There is much to be said in favor of this method but also a 

 few adverse points to consider in its possible application to 

 Montana conditions. The most economic way of handling all 

 insect-control problems is to apply the remedy, whatever it may 

 be, before the insects have reached the outbreak stage. That is 

 the cheapest and in many cases the only feasible line of attack. 

 This approach to the range-grasshopper problem has been tried 

 and proved successful in British Columbia where very extensive 

 range areas are under the control of relatively few individuals. 

 There the warrior grasshopper is the dominant species. This 

 'hopper has two rather conspicuous characteristics. It is very 



TABLE 3. — TOTAL NUMBER OF GRASSHOPPERS BY SPECIES AND FREQUENCY 



OF OCCURRENCE ON RANGE AND TN CROP SUMMARIZED 



FROM 30 COLLECTIONS, JULY. 1936 



Scientific name Common nan;e Total collected Frequency of occurrence 



if any Range Crop Range Crop 



Melanoplus mexicanus Lesser Migratory 336 430 16 12 



Melanoplus bivittatus Two-striped 1 18 16 



Melanoplus packardi Packard's .59 3.5 14 7 



Melanoplus occidentalis 11 4 3 2 



Melanoplus infaiitalis 107 7 15 3 



Melanoplus confusus 2 2 



Melanoplus femur-rubrum Red-Legged 5 3 1 



Melanoplus bowditchi 10 10 



Camnula pellucida Warrior 63 172 9 5 



Dissosteira Carolina Carolina 10 6 5 4 



Aulocara elliotti Big-Headed 440 178 19 9 



Metator pardalinus 25 15 8 7 



Aeoloplus turnbulli 72 15 7 5 



Orphuella pelidna 1 1 



Hadrotettix trifasciatus 4 1 3 1 



Ageneotettix deorum 165 9 16 2 



Bruneria brunnea 2 6 2 1 



Derotmema haydeni 8 6 4 1 



Amphitornus coloradus 35 4 7 2 



Cordillacris crenulata 24 6 



Trachyrhachis kiowa 27 1 12 1 



Hesperotettix viridis 9 4 



Aeropedellus clavatus 4 10 



Drepanopterna femoratum 19 4 



Trimerotropis campestris 5 3 



Trimerotropis laticincta 3 1 



Trimerotropis agrestis 1 1 



Cordillacris occipitalis 2 2 



