6 MONTANA EXPERIMENT STATION BULLETIN 457 



state. Heavy damage was caused to the range, in some instances 

 necessitating the disposal or movement of cattle from these badly 

 infested ranges. An adult survey of the range populations showed 

 that 32 species of grasshoppers were present. The following is a 

 list of species and the percentage in which they occurred : 



29.8 Melanoplus raexicanus (Saussure) 



18.9 Phoetalictea nehrascennis (Thomas) 

 18.0 Ageneotettix deorum (Scudder) 



6.9 Drepanoterna femoratuTn (Scudder) 

 2.7 Opeia ohscura (Thomas) 



2.6 Melanoplus keelari (Thomas) 



2.3 Melanoplus jemur-ruhruvn (DeGeer) 



2.2 Philhosti'oma quadrivnaculatunn (Thomas) 



2.1 Trachyrpachis kioioa (Thomas) 

 1.9 Ericoptolophus costalia (Scudder) 



1.7 Hesperotettix viridis (Thomas) 



1.3 Melanoplus packardii (Scudder) 



1.2 Spharagemon sp. 



1.0 Amphitornus coloradus (Thomas) 



1.0 Arphia sp. Arphia 



1.0 Aulocera elliotti (Scudder) 



1.0 Melanoplus dawsoni (Scudder) 



.8 Hypochlora alba (Dodge) 



.7 Hadrotettix trifasciatus (Say) 



.7 Melanoplus gladstoni (Scudder) 



.5 Melanoplus hivittatus (Say) 



.3 Melanoplus infantilis (Scudder) 



.3 Mermiria maculimennis (Bruner) 



.3 Metator pardalinus (Saussure) 



.2 Melanoplus howditchi (Scudder) 



.2 Melanoplus differentialis (Thomas) 



.1 Melanoplus angustipennis (Dodge) 



,05 Acrolophitus hirtipas (Say) 



.05 Aecloplus turnhulli (Thomas) 



.05 Boonedon nuhilum (Say) 



.05 Dissosteira Carolina (Linneaus) 



.05 Trimerotropis sp. 



It is of interest to note that 29.8 percent of the hoppers col- 

 lected were Melanoplus nnexicanus. The heavy build-up of this 

 species seems particularly significant because it has not been the 



