39 
Fig. Zb.—Agathis {Cremnops) vulgaris: female, head at left; 
abdomen of male, side view, at right— enlarged (redrawn 
after Insect Life, Division of Entomology). 
data accumulated by the Department of Agriculture. The life history 
has not been followed throughout, but two generations have been dif- 
ferentiated, and possibly a third is produced in the most southern 
region which the insect inhabits, the moths from which issue in 
autumn. Where observed 
in Nebraska there was a 
short-lived July genera- 
tion, requiring only two 
weeks between the matu- 
rity of the caterpillars 
and the appearance of the 
moths, which coupled and 
deposited eggs for another 
generation. The caterpil- 
lars of the July brood 
transform to pupa3 almost 
immediately after entering- 
the ground, but the last 
generation remains as lar- 
vae for some time before as- 
suming the chrysalis stage. 
A wild food plant, pigweed 
or careless weed (Amaranthus), has been observed, and it has been 
noticed also that injury to fields of sugar beet are most observable 
where the ground had been allowed to run to this wild plant. In 
Europe it lives on another pigweed (Artemisia). A parasitic enemy 
of this species is illus- 
trated in figure 35. 
THE GARDEN WEB- 
WORM. 
(Loxostege similalis Gn. ) 
The garden webworm 
has the same natural food 
plant (Amaranthus) as the 
sugar-beet species, but is 
native to America, and 
although widely distrib- 
uted is somewhat re- 
stricted as regards im- 
portant injuries to the South and Middle West, particularly in States 
between the Mississippi Valley and the Rocky Mountain region. In 
1885 it was the cause of serious trouble over a large area, including 
five States and Indian Territory." It is a general feeder, and attacks 
most vegetables, cereals, grasses and other forage crops, as also tobacco 
Fig. 'S6.— Loxostege similalis: a, male moth: b, larva, lateral 
view; c, larva, dorsal view; d, anal segment; e, abdominal 
segment, lateral view; /, pupa; g, cremaster— o, b, c, /, 
somewhat enlarged; d, e, g, more enlarged (reengraved 
after Riley, except c, original, Division of Entomology). 
«Rept. Comm. Agr. for 1885 (1886), pp. 265-270. 
