300 
THE STUDY OF INSECTS . 
tratc this group. Chamyris cerintha (Cham'y-ris ce-rin'tha) 
(Fig. 358) is white, with the fore wings 
marked with shades of olive, brown, and 
blue. The hind wings have a narrow 
border of dark scales, within which 
there may be a cloudy shade as shown 
Fig. 358. — chawyris ce- in the figure, or this shade may be want- 
nntha . J 
ing. The larva feeds on the leaves of 
apple. The second of our illustrations of this group is 
Fig. 359 .—Acontia 
candefacta. 
Acontia candefacta (A-con'ti-a can-de-fac'ta) 
(Fig. 359 )- This species is also largely white, 
with the fore wings marked with shades of 
olive, brown, and yellow. The amount of 
yellow varies greatly in different specimens. 
The larva feeds on the leaves of Ambrosia artanisicefolia. 
The Boll-worm, Heliothis armigera (He-li-o'this ar-mig'e- 
ra).—This widely distributed pest is best known in its larval 
state ; but the larva varies so greatly in color and markings 
that it is difficult to prepare a description by which it can 
be recognized. The senior author has published colored 
figures of this insect, including five varieties of the larva, in 
his Report on Cotton-insects and also in the Report of the 
U. S. Department of Agriculture for 1879, Plate VIII. The 
larva when full grown measures about one and one half 
inches in length. It is often found feeding on the tips of 
ears of growing corn. It also frequently infests tomatoes, eat¬ 
ing both the ripe and the green fruit. Occasionally it is found 
within the pods of peas and of beans eating the immature 
seeds. But the most serious of its injuries is to cotton. 
The larva bores into the pods or bolls of the cotton, destroy¬ 
ing them. The injury thus done to the cotton crop is 
second in importance only to that done by the Cotton-worm, 
which destroys the foliage of the plant. Much can be done 
to check the injury of the Boll-worm to cotton by planting 
rows of corn in the cotton-field, and collecting the larvae of 
the early broods from the ears of corn, thus reducing the 
