THE WHITE BUTTERFLY. 
269 
it resembles in form. When fully grown, it measures from 
two to two and a half inches in length ; it is of a green color 
above, with little blue dots in rows, a yellow eye-spot with 
a black centre on each side of the third segment, a yellow 
and black band across the fourth segment, and the head, 
belly, and legs are pink. It suspends itself and becomes a 
chrysalis about the first of August, and is not changed to a 
butterfly till the month of June in the following summer. 
Great numbers of these butterflies are sometimes seen around 
puddles of water left by rain in New Hampshire, where this 
species is much more common and abundant than in Massa- 
chusetts. 
The caterpillars of the three foregoing species are the 
only ones in Massachusetts which are provided with forked 
scent-organs, capable of being withdrawn and concealed 
within the first segment of the body. All which follow are 
destitute of this means of defence. 
In Europe there are several kinds of caterpillars which 
live exclusively on the cruciferous or oleraceous plants, such 
as the cabbage, broccoli, cauliflower, kale, radish, turnip, and 
mustard, and oftentimes do considerable injury to them. 
The prevailing color of these caterpillars is green, and that 
of the butterflies produced from them, white. 
They belong to a genus called Pontia; in which the hind 
wings are not scalloped nor tailed, but are rounded and 
entire on the edges, and are grooved on the inner edge to 
receive the abdomen; the feelers are rather slender, but 
project beyond the head ; and the antennae have a short 
flattened knob ; their caterpillars are nearly cylindrical, taper 
a very little towards each end, and are sparingly clothed 
with short down, which requires a microscope to be distinctly 
seen ; they suspend themselves by the tail and a transverse 
loop ; and their chrysalids are angular at the sides, and 
pointed at both ends. 
In the northern and western parts of Massachusetts there 
ls a white butterfly, which, in all its states, agrees with the 
