-56i- 
The species M. occidentalis Thos. occurs in several of the Western States. 
It has been considered as restricted to range land areas and to have little 
"bearing on crop protection. In 1938 "the species was known to "be present in 
only a snail area in the northwestern part of Wye County, Nev. , hut has spread 
materially, covering some Sb,500 acres, as estimated by the 1940 fall adult 
survey. Crop damage by M. occidentalis lien remained insignificant and range 
destruction hen not been gree,t, except in localized areas. Populations of M. 
me xi conus expected in eastern Wyoming and northern and northeastern Colorado 
did not develop. The hatch was light during the protracted rainy, cool wee, the; 
late in the spring, with an apparent further reduction of early instar nymphs. 
Data obtained from egg surveys in the fall of 1940 indicate a general dove 
ward trend of infestation for 1941, with longer populations in South Dakota, 
Worth Dakota, Minnesota, Kansas, Webraska, and Montana. (See map.) (B. M. 
Caddis , Bureau of Entomology and Plant Quarantine, U, S. D. A. ) 
MORMOW CRICKET 
According to the adult and egg surveys conducted in the fall of 1940, more 
than 8,000,000 acres of land were infested in the nine Stales included in the 
surveys, about 9»000,000 acres less than in 1939. The widespread infestation 
formerly present in Montana ha„s been reduced by approximately 3*000,000 acres. 
Severe infestations in Wyoming hove also been gree,tly reduced in size. In- 
creases in the size of severe infestations have occurred in parts of Oregon, 
Wevado,, and Idaho. A" marked decrease in the number of heavily infested acres 
has been noted in 1040, as compared with 1939 • The number of moderately in- 
fested e„cres has increased by approximately 50,000, and the total number of 
heavily and moderately infested acres within 5 miles of .agricultural lands has 
decreased by about 300,000. The number of lightly infested acres has decreased 
by about 4,000,000. Results of the egg survejr conducted in the autumn of 1940 
indicate that the Mormon cricket outbreak in 194l may be most evident in north- 
ern Nevada, southeastern Oregon, and southern Idaho, with less aggravated con- 
ditions in the neighboring Rocky Mountain States. Mormon cricket eggs deposits 
in the Big Horn Mountains of Big Horn and Sheridan Counties, Wyoming, in 1939* 
did not hatch in 1940, but many of these eggs were showing considerable embry- 
onic development in the fall of 1940. The accompanying map shows the infesta- 
tion expected in 194l. (3. M. Gaddis, Bureau of Entomology and Plant Quaran- 
tine, U. S. D. A.) 
EUROPEAN CORN BORER 
Following a winter during which European corn borer mortality over the in- 
fested area as a whole was r.bout average, borer development during the 1940 
season was characterized by late oviposit ion, associated with delayed pupation 
and emergence or with prevailing low temperatures subsequent to emergence be- 
ing reflected in retarded oviposition. In the Lake States area an increased 
trend toward a second generation was observed, particularly in the southern- 
part of the infested part 'of Indiana and in southwestern Ohio. Distribution 
records of the occurrence of the corn borer in 1940, principally by State 
personnel, have established the presence of the borer in the following counties 
not previously reported a.s infested; Champaign, De Kalb, Ford, Grundy, Iro- 
quois, Kane, Kendall, Livingston, McHenry, McLean, Vermilion, and Winnebago in 
