71 
however, more destructive in the more northern states. The 
sexes of this butterfly also differ, but not nearly so much as is 
the case with the native species. As both kinds of white but- 
terflies have very similar life-histories, both will be discussed 
at the same time. ‘To enable those readers who take special 
interest in entomology to distinguish them, a description of all 
stages of both species is given below, in smaller type. 
IMPORTED CABBAGE BUTTERFLY. 
(Pieris rapee Linn.) 
The eggs are fusiform and beautifully ribbed longitudinally. They are 
at first white, but later become yellowish; they are very small and diffi- 
cult to detect, being usually deposited singly or in groups of two or three 
upon the outer surface of aspreading leaf, and not upon the cabbage- 
head. 
The caterpillar is of a delicate bluish-green color, with a pale whitish 
or yellowish stripe down the middle of the back. On each side there is a 
row ot poorly-defined yellow spots on a line with the spiracles. It is very 
pale when first hatched, but becomes darker with age. It is about 30mm. 
(14 in.) long when fully grown. 
The chrysalis is of nearly the same color as the larva, but usually a lit- 
tle paler. Itis sprinkled with very small black dots. 
The butterfly has white wings. The front wings are tipped with black 
and have, in the male, a smaJ1 black spot midway between the center of 
the wing and the margin. The hind wings of both sexes have a spot on 
the front margin. Underneath the hind wings are yellowish and the front 
wings white tipped with yellow, and having two black spots like those 
on the upper surface of the wings of tbe female. There is a great varia- 
tion in this as well as in the native species. 
NATIVE CABBAGE BUTTERFLY. 
(Pieris protodice Bd.—Lec.) 
"The eggs of this species are slender and pointed very much like those 
of Pieris rape. They are greenish-white in color, and are placed on the 
under side of the leaves. They are about 1 mm. long. 
The caterpillars are quite different from those of P. rape, being 
greenish-blue with four yellowish stripes running lengthwise. The en- 
tire body is covered with small black dots. When first hatched the color 
is orange, but soon after the first molt the true colors appear. 
The chrysalis differs from that of P. rape in being pale bluish-gray in 
color, and in having larger black dots. The ridges or prominences are 
tinged with buff or pink. 
The adult is very like that of P. rapw, but has more black on the 
wings. In the male there is an oblong or trapezoidal black spot near the 
middle of the front margin, a small black border at the margin of the 
apex, a row of black spots crossing the wing transversely between the 
