54 



ON PLANTS AND INSECTS. 



[LECT. 



of the eye-spots appear on the fourth and fifth segments, 

 shown by a slight wave in the upper line. After 

 another five or six days, and when about half an 

 inch in length, our caterpillars moult again. In their 

 third stage (Fig. 40), the commencement of the eye- 



JL 



FIG. 40. Chcerocampa elpenor. Third stage. 



spots is more marked, while, on the contrary, the lower 

 longitudinal line has disappeared. After another moult 

 (Fig. 41), the eye-spots are still more distinct, the white 

 gradually becomes surrounded b}^ a black line, while in 

 the next stage (Fig. 42) the centre becomes somewhat 



FIG. 41. Chcerocampa elpenor. Fourth stage. 



violet. The white lines have almost, or entirely disap- 

 peared, and in some specimens, faint diagonal lines make 

 their appearance. Some few assume a brownish tint, 

 but not many. A fourth moult takes place in seven 

 or eight days, and when the caterpillars are about 

 an inch and a half in length. Now, the difference 

 shows itself still more between the two varieties, some 

 remaining green, while the majority become brown. 



