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MICHIGAN 
A portion of the State lies in the northeastern pine forest region, 
part in the northeastern hardwoods, and part in t he southern hardwoods. 
The densest white pine forests in the country were once found on the sandy 
loan soils of Michigan. Most of these have "been denuded, leaving large 
areas of cut-over stump grasslands which fom ideal breeding grounds for 
Cannula pellucida and M. nexican us under con'Dined conditions of drought and 
cverpasturir.g. Sone 250 specier cf weeds and grasses are listed for this 
State and they abound in these stump lands. They are listed mostly as to 
genera under the natural vegetation of this State. 
Most of the collections were made in some type of grassland, small 
grains and legumes being the only crops included. Some 6,673 specimens, 
representing 12 species, were collected. The number of species here is 
about one-fourth that of the short-grass region, one-half that of the tall- 
grass prairie, and about equal to the number of species found, at elevations 
of 8,500 feet and higher in Colorado. The amount of plant cover has some- 
thing to do with the population and variety of species, the denser the cover 
the less the population and the number of species. 
In all of the collections M. mcxicanus made up 72 percent of the 
total. This species wes dominant by far in both the Upper and Lower 
Peninsulas. C. pellucida was -second, being more numerous in the Upper 
Peninsula. M. femur - rub rum was probably third in numbers, at least in the 
Upper Peninsula, with Agencotettix deorum in about equal numbers in the 
Lower Peninsula. 
In 1934 C. pellucida outnumbered M. mcxicanus two to one in the Upper 
Peninsula, but in 1935 M. mexicanus outnumbered C. pellucida more' than three 
to one. Cold rains and foggy weather during the hatching season reduced 
all grasshopper populations here and nore especially C. pellucida . In the 
Lower Peninsula, M. mexicanus outnumbered C. pellucida ten to one. The 
average infestation in the Upper Peninsula in 1934 was about 2.5 times as 
great as in 1935. In the Lower Peninsula, that is in 30 counties in the 
upper half, the 1935 infestation is about 25 tines as great as in 1934. 
