62 PROCEEDINGS OF THE AMERICAN ACADEMY 



yellow, and dusky at base, the two on the 9th segment being pale 

 sea-green, with a black patch or band on the side extending around 

 behind. The double large median tubercle on the 8th abdominal seg- 

 ment is now lemon-yellow, like those in front, with a large trape- 

 zoidal black patch on the posterior half, which does not reach up as 

 far as the origin of the black spines. The spiracles are ringed with 

 black. 



By 3 p. M. all the dark portions and markings had become jet- 

 black ; there are now ten black spots on each segment, and the larva 

 had now attained a length of 18 mm. 



Stage III. — Length 20 mm. The following is the description of 

 this stage when fully completed, and the color of the markings fully 

 established. The head is black, with the clypeal and labral regions 

 green, while an irregular green band passes back from the labrum 

 above the eyes to the side of the head, the latter being now about two 

 thirds as wide as the body. The larva is cylindrical, the tubercles 

 are high and thick, the longer bristles being as long as the tubercles 

 themselves. All the prothoracic tubercles are black ; the two dorsal 

 ones on each side being united by a black shining bridge at their base. 

 The tubercles of the 2d and 3d thoracic segments are now deep 

 coral-red, with black bristles ; they are larger than the abdominal 

 ones, and are very showy. The two dorsal rows of abdominal tuber- 

 cles are lemon-yellow with black spines, and black at the base behind 

 and on the sides. The single median spine on the 8th segment is 

 nearly twice as thick as the others of the same segment on each side. 

 The two lateral rows of tubercles are black, with the ends of a beautiful 

 pale blue, approaching lapis-lazuli. There are a median and two lateral 

 rows of black spots, situated between the spines ; the median dorsal 

 series consists of two spots, one in front of the other ; while the 

 spiracular series consists of two, one in front, and the other behind, 

 but lower down than the spiracle. In some examples the body is 

 yellowish. 



The thoracic legs are black ; those of the abdominal region green, 

 but shining black on the outer side ; the anal legs with a shining black 

 patch nearly covering the outside of the leg. In one example the 

 tubercles are aborted on the left side of the 2d and 3d thoracic and 

 the 1st abdominal segments. 



Stage IV. — July 12, one had just moulted, the end of the body 

 having just been withdrawn from the cast skin at 11.10 A. M. Length 

 25 mm. The head and prothoracic segment are green, while all the 

 prothoracic tubercles and those of the subdorsal and infraspiracular 



