74 



few hairs upon the body, and these are mostly confined to the terminal 

 segment and the head, where they are much sliorter than in the first stage. 

 When 25 mm. long, the hairs have entirely disappeared, excepting one or 

 two on the terminal segment, wliich are directed backward; as in the earlier 

 stages the larva is green, but hitherto the markings are confined to a dusky 

 streak along the back, largest on the front of each segment, and a fainter 

 streak along the middle of the sides: now the markings of the full grown 

 larva first appear; until this period also, the spiracles have been testaceous 

 with pale green borders: now they are black, with a faint purplish areola. 

 When 45 mm. long, the head loses its rough points, and its surface becomes 

 obscurely shagreened; the spiracles again become testaceous, or of a pale 

 straw-color, surrounded by a ring of jet black, and this again by purplish, 

 which also is indistinctly edged with black. These peculiarities continue 

 imtil the final stage, excepting that the edges of the stigmatal openings 

 become dark, and the purplish annular ring, as well as the outer indistinct 

 black bordering, become proportionally broader. 



The full grown larva is green (of varying shades), with a moderately nar- 

 row oblique white stripe, bordered above with dark brown, crossing the 

 1-8 abdominal segments at an angle of 45° from below upwtirds, starting at 

 the front edge of each segment directly in front of the spiracles. The 8th 

 abdominal segment has also a second streak parallel to the first, being 

 a continuation of that on the preceding segment, and extending a little 

 way up the side of the caudal horn. Fainter sti'eaks of the same color also 

 cross the same segments, each connnencing at the same jjoint and running 

 backward with a slight downward tendency to the posterior edge of the 

 segment, so as to form a broken substigmatal band. On the eighth abdom- 

 inal segment the streaks do not reach the posterior edge. The last seg- 

 ment is edged with white. There are also faint dusky oblique streaks on 

 the 2-8 abdominal segments (often obsolete) in continuation of the oblique 

 white streaks of the preceding segments, and nearly uniting at their 

 posterior end with those of the opposite side. Minute circular white dots, 

 bearing a microscopic hair and edged with purplish brown, are scattered 

 over the upper surface of the body, especially on the anterior segments. 

 Tlie caudal horn is slightly curved backward, and is generally held at an 

 angle of 45°; it is of a bluish color, whitish on the sides, and studded with 

 black thorns, or sometimes the whole horn is black; it varies in length in 

 proportion to the body at difi'ercnt stages, as Avill be seen by the following 

 measurements. 



Length of body 5 mm.; breadth of same, .85 mm.; length of horn, 2.5 mm. 

 " " 12.5 " " " 1 " " " 3 '' 



" " 16 " " " 2 " " '' 4.25 " 



" " 25 " " " 3 " " , " 5 " 



" " 45 " " " 9 " " " 8.5 " 



•' " 75 " " " 17 " >' " 8.5 " 



