M S38 ** 
MICHIGM 
This is the fith year that collections have heen made in typical: 
environments in Michi^in during the adult survey. There were 17,876 ^ecimens| 
collected in 10 habitats and 19 species of Acrididae were included in the | 
collections. The family .Tettigoniidae is grouped as a y/hole. Mel ano plus p 
mexicanus was by far the dominant species in all the environments. M, femur~ 
rubrum was second in numbeqrs and Ageneotettix deorum third. Camnula 
pellucida , once an important species, was fourth in abundance. There was | 
some change in the relative abundance of the species from 1938 to 1939. i 
femur-*rubrum increased in relative abundance and C. pellucida greatly de-» | 
creased, M. mexicanus was not as dominant in 1939 as in 1938, . | 
The worst infestations are to be found in the northern half of the | 
Southern Peninsula, where,.! ight to severe infestations occur,. In the Upper || 
PeninsuJ.a, threatening to severe infestations are few and widely scattered. 
