80 
BULLETIN 1476, U. S. DEPARTMENT OF AGRICULTURE 
Considering the inadequacy of the experiments here described 
definitely to establish the relation between climatic factors and the 
various phases of development, it would not be expedient to advance 
•<D 
Id 2fl JO 40 5,0 
\0 2 
30 A0 5, 
TE 
STHSJINCHES 1 
jg^-£ Iprexipitati 
ON 
TENT HS ! INCHES 
7 PRECIPITATION 
2 -i 
/ / 1 >5 
1 1 
-: 
Id 
/ 
»/ 
io/ L^ 
V 
7/ !0 
_ 
*^ ■ — 
<S''' 
/ ' /' 4 
/ /'corn 
' / 1 
J BELT 
1 
HUNGARY 
o - 
W ! 
T 
1 
/fc <<*, 1 A 1 
c 1 
i/ 
r i 
1 
1 
1 
! 4 
^«v. 
D 
1 
j 
1 
1 
)> 
1 / ° 
a ■ 
i 
/'-' 
o 
c: 
V 
lAf ITALY 
/ \ U KRAI N|l A 
r 
\^\ i 
3 
1 ) ;l 
G 
i 
B 1 
I 
l 
j'l 
d! 
D 1 
1 
1 
1 
1 
Fig. 39. — Cliniographs of typical localities in the Corn Belt, and of localities known to 
be infested in Italy. Hungary, and Ukrainia. Constructed from the averaged normal 
means (.Weather Bureau) of the towns listed under each locality 
A. Corn Belt : Sioux City, Iowa : Clarinda. Iowa : Webster City, Iowa : Waterloo. Iowa ; 
Mount Pleasant. Iowa : Monmouth, 111. ; Pontiac, 111. ; Urban a, 111. ; La Fayette, Ind. ; 
Bluffton. Ind. 
B, Italy (two generations ^ : Treviso. Oderzo. Conegliano. 
C. Hungary (one generation) : Bacsfoldvar (Yugoslavia), Hodmezo-Vasarhely, Meso- 
hegyes. 
D, Ukrainia (one generation) : Poltava. Odessa. Xikolaev, Kherson. 
at this time a conclusive statement regarding the status of the insect 
in new localities to which it may spread. 
K. W. Babcock began in 1924 a careful survey of the insect in 
its native home, with a view to obtaining accurate data concerning 
