71 
It is of nearly the same green color, but the sides of the head and the 
legs are not marked with black. There are two white undulating 
stripes on each side of the middle of the dorsum and a broad yellowish 
white stripe above the stigmata. In most individuals one or more of 
the abdominal segments bear on each side a black suprastigmatal 
tubercle. 
The last stage. — In the last stage the larva may be readily distin- 
guished from the common cabbage Plusia by the long eye-like ellip- 
tical spots on each side of the head. The hind pair of thoracic legs 
are nearly black, the middle pair a little lighter, and the front pair 
still paler. The dorsum is mottled with white, the lines being irreg- 
ular, and the dorsal tubercles, of a green color, being quite prominent. 
The lateral stripe of the abdomen is broad, white, and well defined. 
In some individuals on the first two or three abdominal segments the 
suprastigmatal tubercles are black, but imagos hatched from larva? 
thus colored look no different from those hatched from unmarked 
larva?. There is also considerable difference in the arrangement of 
the white marks on the back, the same being true of the common 
cabbage Plusia. In some individuals these white marks show as four 
strong undulating stripes, while in others half a dozen or more very 
irregular striped markings are seen. In one individual the black 
lateral spot on the head was much less strongly defined than in the 
others. When f ull} 7 matured the larva measures in its natural slightly 
curved position about one inch in length. In figure 15, 5, a larva is 
shown extended in a position which it often assumes. 
The pupa (c) does not appear to have been described. It is not likely 
that it differs in any important particular from that of P. brassicse. 
The eggs have not been compared with those of P. % hrassicde, but it is 
more than probable that they are nearly identical, and, in fact, the 
species differs very little in structure and life history from that of the 
common cabbage looper. 
DISTRIBUTION. 
Smith states that this species occurs in the United States east of the 
Rocky Mountains from May to October, also in Canada. Exact records 
of localities are rather meager. They include Canada; Cambridge, 
Mass.; Sharon, Pa.; Dayton, Ohio (Pilate); Woodstock, 111.; Wiscon- 
sin; and the District of Columbia. Hanham states that this species is 
rare at Winnipeg, Manitoba. It does not seem probable that the 
insect breeds there, but is merel} T a stray from a more southern and 
congenial locality. 
HISTORY OF THE SPECIES. 
The biological literature of this looper is quite limited, which is to 
be explained by its seldom having been found attacking useful plants. 
In the year 1869 Dr. A. S. Packard made mention of this species in 
