20 
basal half of this band in the front wing is darker than the term¬ 
inal half, except towards the costa, where there is a roundish 
dusky spot. The basal edge of the band in the hind wing has a 
small longitudinal dusky spot on the costal and on the bifurcations 
of the sub-costal nervure, on the principal or middle 'sector’ of 
the ‘arc,’ the two interior sectors of which are often, one or both 
of them, obsolete, and also on the trifurcations of the median 
nervures—making in all, seven spots. The nervures in both wings 
are of the same color as the portion of the wing which they trav¬ 
erse, except the ‘arc’ or semi-circular transverse nerve in the hind 
wing, connecting the sub-costal with the median, which is widely 
dusky. The fringe of both wings is yellowish white, with a few 
dusky dots, especially towards the tips. 
“Inside the fringe there is in the front wing a series of eight, and 
in the hind wing a series of six black dots, commencing at the tips, 
and placed one between every two nervures, including only the 
principal ‘sector' of the lower wing. 
“The thorax, head, palpi and antennae are of the same color as 
the general upper surface of the front wings, the antennae towards 
the base being lighter. The eyes are hairy and of a dull, greenish 
color. The thorax has a narrow band of a lighter tint in front, 
much curved forwards in the middle, and separated from the darker 
tint behind it by two very distinct narrow bands or lines—the ante¬ 
rior very light, the posterior very dark. The abdomen above is of 
the same grey color as the hind wings above. Beneath the 
prothorax is- dusky grey; the thorax and abdomen of an ash grey, 
the latter speckled with a few black atoms, and with a row of three 
black spots on each side of it, which are sometimes confluent. 
The wings expand from one and one-half to one and three-quarter 
inches. Length of body when dried, three-quarter inch or less. 
The above description applies to seven individuals from Union 
county, Centralia, Bloomington and Rock Island, which exhibit no 
material variation, except that in one specimen the median nervure 
is edged with dusky from the white spot to its base.” 
The variations observed in the perfect insect depends more upon 
the character of the season and time of year than on locality. 
TERMS OF LIFE. 
In order to settle some of the questions in reference to the life- 
history and habits of the species, it is necessary to ascertain what 
is the average length of the different stages, viz: Of the egg from 
the time it is deposited until it hatches; of the larva state; of the 
pupa state; and of the moth from the time it emerges from the 
chrysalis until its eggs are deposited. Although the moth may live 
an indefinite time after it deposits eggs, it is unnecessary to take 
this into consideration, as the life cycle is complete when the eggs 
are deposited. 
Where positive data ascertained by experiments can be found it 
is undoubtedly best to use it, at least as a basis, and we expect to do 
so in this case, but the growth and development of individual in¬ 
sects in a uniform temperature with abundance of food placed in 
reach, can seldom, if ever, be accepted as exactly what it would be 
in a state of nature. 
