= hae 
Ten additional cages were set up at the same time (September. 28 
to October 10) with 100 male E. tenellus in each for the ourpose of .. 
determininzs the survival of these in comparison with fenales sinilar- 
ly caged. From these cages » total of 95 males were recovered, giving 
a mortality of 90.5 percent. This unusual occurrence of the survival 
of even a relatively small percentage of E. tenellus in cages located 
at Twin Falls and the:three regiunal plots (Castelford, Burley., and 
Wendell) is recorded in tabular form as follows: — 
Hibernation-cave recovery of Butettix tenellus on February 
27 to March 2, 1934 







a ae Fenales 
Locality Caved __ Recovered Mortality 
> Number Number Percent 
Twin Falls 1,900 591 59 68.89 
Burley > 2,000 646 67.79 
wendell 1,960 795 58.00 . 
Castleford 1,200 1,190 37.40 

The foregoing summary, taken from observations by D. E. Fox, of 
the Twin Falls, Idaho, laboratory, shows a reletively high recovery 
from the cages in ail these lucalities, with the average mortality 
highest at Twin Falls and lowest on the Castleford plot. 
Conditions favorable for high nopulations of beet leafhopper in 
Salt Lake City area.--E. ti. Davis, of the Salt Lake City, Utah, lab- 
oratory, reports as follows: "In a check we find rather high popu- 
lations (of E. tenellus) from Nephi north. at Elborta 5 females were 
found in 50 sweeps; at Pelican Point, just west of Utah Luke, 9 in 
oU sweeps; in Tooele Valley, 8 in S 0 sweeps; at Grantsville, 12 in 
oU sweeps; and at Magna, 4 in tu sweeps. This year E. tenellua over- 
wintered in an area where it had not been found to overwinter since 
1927. We are finding E. tenellus over practically the entire distance 
from Salt Luke south to the south end of the beet~growing area in 
Sevier Valley. Normally we do not find any E. tenellus overwinter 
in Sevier Valley, and very few in the area around Salt Lake. The 
area of host plants that have survived the winter extends over practi-~ 
cally all the area from Salt Lake to the south end of Sevier Valley. 
This is another condition that has not previously been found. As a 
rule no winter host plants have been found gouth of Nephi. The area 
of best plants in the Magna breeding area this yesr is larger than 
in previcus years and the mild temperature has »ermitted the E. tenellus 
to go through the winter with less than normal nortality."” 

