MONTANA EXPERIMENT STATION BULLETIN 474 



1949-1950 MONTANA RANGE GRASSHOPPER STUDIES 



Range grasshopper studies were carried out during 1949 and 

 1950 on the Kendrick Cattle Company OW Ranch, Decker, Mon- 

 tana. Daily observations of grasshopper activities were made from 

 the time of the first hatch in the spring until the majority of the 

 'hoppers had disappeared in the fall. Grasshopper populations were 

 sampled and utilization of grasses in the two dominant vegetative 

 types found in the area was measured. In addition, daily temper- 

 ature and precipitation records were kept. 



Within a forty acre range land area of the OW Ranch, the 

 following grasshopper species were found in 1949: 



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Acrydium granulatmn Kirby 

 Acrydium acadicum acadicum (Scudder) 

 Pseudopomala brachyptera (Scudder) 

 Mermeria maculipennis Bruner 

 Opeia obscura (Thomas) 

 Aeropedellus clavatus (Thomas) 

 Psoloessa delicatula (Scudder) 

 Ageneotettix deorum (Scudder) 

 Drepanopterna jemoratum (Scudder) 

 Aulocara elliotti (Scudder) 

 Eritettix tricarinatus (Thomas) 

 Acrolophitus hirtipes (Say) 

 Amphitornus coloradus .(Thomas) 

 Phlibostrovia quadrimaculatum (Thomas) 

 Cordillacris crenulata (Bruner) 

 Orphidella pelidna (Burmeister) 

 Camnula pellucida (Scudder) 

 Encoptolophxis costalis (Scudder) 

 Chortophaga viridifasciata (DeGeer) 

 Dissosteira Carolina (Linnaeus) 

 Hippiscus rugosus (Scudder) 

 Arphia psendonietana (Thomas) 

 Arphia conspersa Scudder 

 Hadrotettix trifasciatus (Say) 

 Spharagemon equale (Say) 

 Spharageinon collare (Scudder) 

 Xanthippus corallipes (Haldeman) 

 Aerochoreutes carlinianus (Thomas) 

 Circotettix rabula Rehn and Hebard 

 Trimerotropis cincta (Thomas) 

 Trimerotropis campestris McNeill 

 Trimerotropis bruneri McNeill 

 Derotmema haydeni (Thomas) 

 Metator pardalinus (Saussure) 

 Trachyrhachis kiowa (Thomas) 



