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, Avith 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 ]\Iassachusetts 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 scent-organs, capable of being withdrawn and concealed 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 

 wino-s 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 ai-e 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 jSIassachusetts there 

 is a white butterfly, which, in all its states, agrees with the 



