- 220 - 
MISSOURI 
This is the first year in which Missouri has "been included in the 
project for making collections in typical environments during the adult 
survey; and, since this is a first tine for this State, something should 
he said regarding its natural vegetation areas. The Stake is divided into 
two major natural vegetation areas. The northern half and western portions 
o.rc tail-grass prairie or bluest cm sod ( Andropogon ) , whereas in the southern 
half and eastern areas and along streams are the southern hardwoods, "oak 
and hickory" and "oak and pine." About 38 percent of the land area is in 
cultivated crops. The crop land is intensively cultivated, with most of the 
grasshopper breeding grounds limited to field margins, alfalfa fields, and 
small pastures. 
There were 8,198 specimens collected in 7 major environments. Of 
this number, the two dominant species were I.ielanoplus diff erentiali s and 
M. nexicanus , forming 20 and 21 percent, respectively, of the total number. 
M. di ff erentiali s by far was the most important species in corn, soybeans, 
and weedy planes. 1L_ mexicanus was dominant in pastures, tame-hay meadows, 
alfalfa, and small grain. Of the total collection 36 percent were nymphs 
of undetermined species. There were 28 species collected and determined. 
Deposition of eggs was heavy in the two dominant species in the fall 
of 1937 but no dense nymphal populations resulted in 1938. Heavy rains, 
prolonged hatching, increased fungous disease, and other causes held them down. 
Mynphs of U. f enur-rubrun were numerous in July, especially in the eastern 
portions. This accounts in part for the high percentage of nymphs in the 
collections. 3y the first week in Hay. about 50 percent of the M. mexicanus 
and M. bi vittatus had hatched, whereas M, diff erentiali s did not begin 
hatching until about the middle of May. Ovipooition for the two former 
species begem about the middle of July, whereas M. dif ferentiali s began a 
month or so later. The grasshopper potential is down from one-third to one- 
half of the potential in the 1937 fall survey. 
