THE SOUTHERN BEET WEBWORM. 
19 
the larvae had pupated and by May 20 the adults had commenced 
to issue, thus giving a total period for the pupal stage of about 12 
days. The moths were placed in a large cage with a growing beet 
and at the end of the week all had died. 
In other sendings of material the moths were observed to issue on 
May 25, June 3, and July 9. 
The length of the egg stage was not ascertained, but it may be 
safely stated to be approximately 6 or 7 days, in moderate or warm 
weather. From eggs laid on June 5 and 6 the adults developed July 
3, giving a total life cycle of 28 days, or 4 weeks, in hob weather, 
which will be about the minimum for the species. Assuming that 
Fig. 3.— Southern beet webworm (Pachyzancla bipunctaUs): a, Moth; b, larva; c, lateral view of first 
proleg and abdominal segment of larva; d, pupa, with cremaster showing location of hooks at right. 
a, b, d, About three times natural size. (Original.) 
from 5 to 7 days is occupied by. the egg stage, and approximately 
the same number of days for the pupal period in hot weather, the 
larval period would be approximately from 14 to 18 days. At least 
four generations are indicated for this species, and it is possible that 
there are more, but there are no positive data on record on this point. 
DESCRIPTIVE. 
TTie moth. — The moth in color varies from buff to very pale yellow- 
ish gray. The wings are slender and the antennse long. In the pale 
forms the wings are nearly transparent, and the surface is rather 
iridescent purplish. The wing pattern of the pale individuals is faint, 
much more so than the illustration (fig. 3, a) would appear to indicate, 
