1!) 
example, a larva which was taken from a cornfield June 9, was uni- 
formly green when placed with food in the breeding cage. June 12 it 
was noted as becoming yellowish, or at least could not be called green. 
Thus several color variations were noted during the larval state of the 
same individual. In most specimens the color remains quite constan. 
Table XI. — Proportion of light and dark larra. 
Source. | Date. 
Light 
green. 
Green. 
Rose. Dark. 
Total. 
Corn May 8 
Do .... May !) 
Table .... May 14-16 
Do Juue 1 
Do June 1 
4 
,17 
1 
2 
4 
6 
10 
]8 
28 
10 
33 
26 
45 
15 
7 
13 
2 
:: 
Total 
26 28 5 67 126 
' 54 72 
Some facts relative to the proportion of light and dark-colored speci- 
mens are presented in Table XI. All the larva 1 were taken from corn 
plants, tassels, and ears. Most of the green ones were about grown, 
the dark ones mostly small. The figures clearly show that for May and 
June the dark worms predominate, comprising about 57 percent of tin- 
number. During July and August the proportion becomes about equal, 
while at the close of the season the light-colored specimens are in the 
majority. 
The larvse are very tenacious of life, as the following note will show: 
One evening an ear of corn containing a nearly grown Boll Worm was 
placed on end in ajar of water to Keep it fresh until next morning. At 
that time the larva was found outside the ear in the water. To all ap- 
pearances it was dead, and was so considered. .Mr. Banks, however, 
placed it upon some dry earth in a saucer exposed to the direct sunlight, 
and the following day we found, to our surprise, that the larva was 
again becoming active. It was later provided with food, upon which 
it fed, pupating perfectly. To our disappointment, however, it died in 
the pupal state. Half-grown worms placed in the bud of young corn 
plants in breeding cages often bored the entire length of the stem to 
the roots. In several instances this left them an inch or two below the 
surface of the water in the vessel, but no harmful effects upon the larva 
were noted. 
In attacking young corn the Boll Worm does not always feed in the 
the bud or heart of the plant, but occasionally takes a position on the 
outside of the stalk Dear the surface of the ground, eating inward as 
if into a boll. This done, the plant wilts and dies. When examined 
and found eaten nearly off, the injury is at once assigned to the work of 
cut-worms, and this is doubtless the true explanation in most such 
cases, but the exceptions should be noted. In the breeding cages, 
where young corn plants were kept fresh and growing in wet moss, a 
