I/O 



ARTHUR G. VESTAL. 



Only the series leading from bare sand to climax forest through 

 the aspen stages of burnt-over pine lands will be discussed in 

 relation to grasshopper succession. The following table, taken 

 from the distribution table on p. 153, and with the same notation, 

 shows the grasshopper species of the various stages. Accidental 

 and atypical occurrences are not recorded. It should be re- 

 membered that the bare soil habitat is never extensive in the 

 region, and that grasshoppers of bare soil depend also upon nearby 

 vegetation. 



TABLE II. 



From examination of the table we see that there is a successive 

 change of species with development of vegetation, and that even 

 when species are not replaced with changes in associations, their 

 numbers are successively increased or decreased. 



The succession from bare sand to closed hardwood forest 

 includes two successional series, the development from very open 

 grassland growth to closed grassland, and the development of 

 closed forest from open forest growth. The transition stage is the 

 open aspen forest, in which trees are small and scattered. 

 Ground conditions, dominated by the bracken-blueberry cover, 

 are those of grassland which has not yet reached the closed stage. 

 The change in ground conditions from those of grassland to those 

 of closed forest is radical, as shown by the great difference 



1 Frequently found, usually not in numbers, but in a few places approaching 

 abundance. 



2 More typical of scattered patches of lichen-covered surface; distribution in 

 bracken-blueberry not continuous. 



