The following descriptions by others are introduced here for the 
purpose of enabling examiners hereafter to determine questions as to 
local varieties. 
Curtis, in his Farm, Insects , briefly describes it as follows: 
The eggs are “not unlike those of P brassicce in form and sculp¬ 
ture, but the caterpillars are totally different, being green and so 
densely covered with minute hairs as to be velvety; they have a yel¬ 
lowish stripe down the back and another along each side, the venter 
being of a paler brighter green; they are often more than an inch 
long and about as thick as a crow quill.” 
His figure shows distinctly the lateral stripe. 
Goureau’s description, in his “ Insectes Nuisibles ,” is evidently copied 
entire from Curtis. 
Boisduval, in “ Entomologie Ilorticole ,” describes it very briefly, but 
mentions three longitudinal yellow lines, one along the back and one 
along each side just above the feet. 
Stephens , in “ British Entomology ,” describes the caterpillar as “green, 
with a pale line on the back, and a whitish line, often punctured with 
yellow, on each side.” 
But the most complete description is that given by Dr. Fitch, in 
his Thirteenth Report; as follows: 
“When examined wflth a magnifying glass, the surface of these 
worms is found to be everywhere bearded w r ith fine short whitish 
hairs, those upon the back shorter, and on the young worms black and 
interspersed with small stiff bristles. These hairs arise from numerous 
minute black elevated points, with which the surface is everywhere 
studded, the larger points being arranged in transverse rows, a row upon 
each of the elevated ridges into w T hich the segments are divided by im¬ 
pressed, slender transverse lines. In addition to these black points, a 
few pale dots or minute warts are more or less perceptible, one ap¬ 
pearing on each side of the middle of the back, on the second ele¬ 
vated ridge of each segment; another lower down on each side, upon 
the fifth ridge, and some others below these. But on each of the 
three first rings these pale dots are arranged in a single transverse 
row, on the first elevated ridge, three dots on each side, placed equi¬ 
distant from each other. Along the middle of the back is a pale 
yellow line, which is sometimes very faint, or visible only on the an¬ 
terior rings. Low down on each side is a row of dots of a brighter 
yellow color than the line on the back, one on each segment, placed 
a little back of the breathing pore. The breathing pores are small, 
broad oval, dull white, inclosed in a black ring, which is bordered 
with yellow, this border being more broad bn the fore side and some¬ 
times wanting on the hind side. The head is spheroidal and as broad 
as the neck, green, and clothed with hairs. The legs and pro-legs 
have the same green color as the bodv.” 
Instead of commencing at the margin of the leaf and eating in¬ 
ward, as is the habit of many leaf-eating insects, it riddles it with 
holes, gradually enlarging these where the worms are numerous until 
all that portion between the veins is consumed. Although they will 
commence operations on either the upper or the under side of the 
leaf, yet my observations lead me to believe they prefer commencing 
on the upper side. Although they bore into the incipient heads, yet 
I did not find this habit so general as I supposed, from what I had 
read in reference to them; in fact, I seldom found them making their 
