- 8 - 
the nun:ber declined and remained at a low level. A few clusters of eggs 
were still present as late as May 6, the date of the final sampling. It 
was thus indicated that oviposition in sourclover growths may continue a 
month or more longer than in alfalfa. 
Individual oviposition records were not attempted, but average figures 
were obtained on three hosts by establishing bulk cages, each containing 
10 pairs of adults. The cages were ordinary jelly glasses with a small 
amount of soil packed in their bottoms and with the original tin lids per- 
forated to provide adequate fresh air. Fresh food and new dry stems v;ere 
supplied on alternate days when counts were made. Adults confined on al- 
falfa were collected fromi aestivation early in December and records are com- 
plete. Cages containing hubam or sourclover were not established until Janu- 
ary 4, when these plants first became available. Adults for these were swept 
from alfalfa, where thej? had already fed and oviposited for approximately 
2 weeks. Consequently oviposition records for adults confined on these 
foods are not complete. The fact that these plants were not available to 
adults eT.erging from aestivation renders it certain that all adults fed 
initially on alfalfa and later dispersed to such other hosts as became 
available. 
Oviposition in two alfalfa cages lasted for 4 and 4j months, respec- 
tively, after initial eggs were deposited on Decem.ber 19. Assuming that 
oviposition of the adults confined on hubam and sourclover began at the same 
time, the oviposition period for hubam cages was 3 and 5 months and for 
sourclover 3 and 3| months. If calculated from the date of establishment, 
the oviposition period on both hubam and sourclover would be approximately 
2 weeks shorter. Results indicate some slight differences in the duration 
of the oviposition period on various hosts, but the evidence is insufficient 
to warrant a final conclusion in this regard. On the basis of only one sea- 
son's work it was indicated that hubam and sourclover promoted equally 
heavy oviposition and alfalfa significantly less, in spite of the fact that 
records on the two first-named hosts were incomplete. Data are given in 
table 1. 
Postoviposition Period 
Most caged females died before their complements of eggs were com- 
pletely exhausted, and no spent females have yet been encountered in dis- 
sections of field-collected adults. In oviposition cages, however, a few 
females survived from 2 days to more than a month after final oviposition. 
Longevity of Adults 
Adults began to die shortly after emergence from aestivation, but 
field and cage studies indicated that mortality was of small consequence 
until early in March. Mortality of old adults was virtually complete by 
April 1, but a few individuals survived throughout May. In 1939 one was 
encountered as late as June 6. It was thus indicated that adults may 
