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Subgenus Heliothis, Ochsenheimer. 
Type: Noctua armigera, JTiibner. 
Heliothis citrinellus, Grote and Robinson. 
Heliothis citrinellus, Grote & Rob., Trans. Am. Ent. Soc., vol. 3, 
p. 180, plate 2, fig. 79, 1870. 
Habitat, Texas. 
Heliothis phlogophagus, Grote and Robinson. 
Habitat, Western States; Colorado Territory (coll. Theo. L. Mead, 
Number 23); California. This species is sometimes confounded 
with H. armigera. In a late number of the American Naturalist 
(April, 1873) it is figured on p. 214, with an erroneous determina- 
tion. On the same page, fig. 40 is considered to represent Anomis 
xylina, which it does not. These errors impair the value of the 
article which the figures illustrate. 
Heliothis armigera, Wiibner. 
Heliothis umbrosus, Grote, Proc. Ent. Soc. Phila., Vol.1, p. 219, 1862. 
This is the “ Boll-worm” of agricultural writers, and is more or 
less destructive to the cotton boll in the Southern States, where it 
is widely distributed. It is there often erroneously considered as 
the same as Anomis xylina, which 1s the true “ Cotton worm,” feeds 
on the leaf, occurs in swarms at varying periods, and belongs 
structurally to a lower group of the family. I consider Anomis 
xylina as an introduction, and not as a true habitant of the Cotton 
belt. From the irregularity of its appearance, its defective economy 
(brought about by feeding on an annual, whereas in the countries 
of which it is a native, the cotton plant lasts several years), and the 
circumstantial evidence offered by its progression northward, de 
novo, every year that it occurs within our limits, I conclude that its 
introduction is due to secondary causes. It is killed out every 
winter with the destruction of the plant by the frost in central 
Alabama, Georgia and the Carolinas. The last act of the successive 
generations is often to fly out of the loosely webbed and defenseless 
