2 
under certain conditions may be a good host. In collecting plant 
samples from an area where nymphs were found for a comparison of 
numbers of nymphs emerging from each plant s ecies, more nymphs were 
obtained from Calandrinia than from all other hosts combined. (4) 
The varying favorableness of a plant species from year to year may 
depend u,on the stage of development of that s,ecies eat the time 
the overwintering leafhopper females begin to lay egzs. This 
development may vary from year to year, degending upon the time of 
germination and ty»e of season. Thus in one year Lepidium may be 
in the proper stage for ovipusition when the females are ready to lay 
eggs, whereas in another year this svecies may be too far advanced 
to be attractive for oviposition." 
High recovery of bect loafhopvers from hibernation cages at Twin 
Falis, Idaho.--The recovery’of BE. tenellus from hibernstion cages was 
greater during the winter of 1935-34 than had been the case the pre- 
vious season (1932-33). These leafhoppers were collected from dead or 
almost dry Salsola pestifer during the last week of Se,;tember and the 
first week in October, and caged immediately on Salsola parviflora. 
The following tabulation shows the mortality of both male end female 
KE. tenellus in the cages at Twin Falls as indicated by recoveries 
made at various periods throughout the past winter seeson: 




Date of Females Males 
recove Caged _ Recovered _ hiortality Caged Recovered Mortalit 
Number Number Percent Number Number Percent 
Dec. 6, 1955 1,000 7155 24.70 300 141 55.00 
Jan. 3, 1934 1,\00 687 oly DU 300 51 83.00 
Feb. 2, 1934 1,000 526 47.40 500 28 90.67 
—— 

Mar. 2, 1934 1,900 sol 68.89 570 57 93.61 

The foregoing data show a high initial mortality of females of 
E. tenellus during the fall months, even though the host conditions 
within the cages were generally excellent. This in all probability 
can be attributed to the poor condition of the leafhop vers themselves, 
for they had:s vent the lete summer and early fall months on S. pestifer 
that was in a continual state of drying. The sudden transfer to green 
and succulent S. parviflora must have offered considerable shock to 
them and probably caused a good share of the relatively high initial 
mortality. 

Thirty male E. tenellus were placed in each cage along with the 
females, and, although the mortality was great, it was less than in 
former years. The foregoing tabulation shows that a relatively high 
percentage of males was recovered on December 6 and that, even though 
the numbers became progressively less, as the season advanced, a few 
were found in the cages as late as March e. 
