60 
SOME INSECTS INJURIOUS TO TRUCK CROPS. 
the various sugar factories indicated that there was a loss in sugar 
content of from 1 to 3 per cent over the badly defoliated area. Over 
a large part of the infested area the defoliation was not bad enough 
to cause any very noticeable loss. 
The author's first observations in the Arkansas Valley on this 
species were made on July 23. 1909. at Rocky Ford. Colo., and the 
following is a summary of his notes at that place and at other points 
in Colorado and Kansas during the season. All notes, except when 
other localities are mentioned, were taken at Rocky Ford. 
Before entering into a discussion of the biology, of the plants 
injured, of the experiments made, and of other matters, attention is 
called to the illustration (fig. IS) which shows the female moth, 
larva?, cocoon, and pupa. This needs no further explanation than 
to state that the moth is of moderate size, its spread of wings 
Fig. IS.— The yellow-bear caterpillar (Diacrisia virginica): a. Female moth: b. larva: c. pale form of larva: 
d. cocoon: e. pupa. (From Chittenden.) 
being from H to 1| inches, ornamented with black dots as indicated, 
and that the larvae vary in color, the dark form (b) and white form (c) 
being shown. 
BIOLOGIC NOTES. 
On July 23 nearly mature larvae of the first brood were fairly 
abundant on lamb's quarters along the fences and irrigation ditches. 
In some places it was noticed that they had spread from the weeds 
to sugar beets and had stripped the foliage from the first three or 
four rows nearest the fences. On August 3 and 4 full-grown larva? 
were found in moderate numbers on sugar beets and lamb's quarters 
at Fort Collins and Greeley in northern Colorado, and on August 10 
