38 MONTANA EXPERIMENT STATION BULLETIN 333 



thoroughly drenched as the success of the treatment depends 

 largely upon the thorough wetting of all of the foliage. 



ALPINE ROCK CRAWLER 



Gryllohlatta campodeijormis Walker 



This rare alpine insect (figure 7) was discovered for the first 

 time in Montana during September, 1936. It has been collected 

 previously at a few points in the northern Rocky Mountains, as 

 far north as Banff, Alberta, and now as far south as southern Gal- 

 latin County, Montana, although we are by no means certain that 

 these points represent the extremities of its range. 



The physical requirements of this insect are interesting in that 

 its normal range of activity lies between 32 F. and 60 'F., with an 

 optimum indicated at about 38"F. It cannot survive 80^ F., a tem- 

 perature at which the most of our summer insects are active. 



While this insect is too rare and too limited in its habitat to be 

 of economic importance, it is likely that its primitive nature will 

 allow rather definite deductions to be drawn as to the relationships 

 of many of our present-day destructive insects. 



