THE CATERPILLAR. 303 



dark brown and very much broken, giving the appearance 

 of a large spot on each segment. The lateral lines are dull 

 yellowish-white. Arrangement of tubercles, bristles and 

 hairs as in the last stage. 



Fourth Larval Stage. Length, 13 mm. (about half an 

 inch), immediately after molting, and the head is 2.8 mm. 

 (about eleven hundredths of an inch) in width, pale brown- 

 ish-white, mottled on the sides and above with dark brown, 

 and there is a dark-brown vertical stripe on each side of the 

 clypeus and numerous pale-yellow hairs scattered over the 

 surface. The body is dark brown, finely mottled with yel- 

 low ; while the dorsal line is pale ochre-reddish, enlarged 

 into small grayish spots on the middle of the sixth, seventh 

 and eighth segments, and on the ninth, tenth and eleventh 

 segments there are larger orange-colored spots. The lat- 

 eral line is pale yellow, and below this the surface is ashy, 

 mottled with dark brown. The tubercles, spines and hairs 

 are as in the preceding stage. 



Fifth Larval Stage. Length, 23 mm. (about nine-tenths 

 of an inch), immediately after molting. The head is 3.6 to 

 4.4 mm. (about fourteen to seventeen hundredths of an 

 inch) in width, or about the same width as the following 

 segments without the lateral tubercles. The ground color 

 is cream- white, and there is a vertical, velvety-black stripe 

 on each side of the clypeus, outside and above which, the 

 surface is sprinkled more or less thickly with velvety-black 

 dots, which are more or less confluent. The labram and 

 mandibles are of a watery, whitish color, and the mouth 

 parts beneath are dull reddish. Scattered over the surface 

 are numerous pale-yellow setaceous hairs, varying in length 

 from the width of the head to half that length. The upper 

 surface of the body is cream- white, marked with black in 

 minute, irregularly formed spots, giving a general dark-gray 

 color, but leaving the dorsal line of a lighter color. The 

 subdorsal tubercles, on segments two to six inclusive, are 

 blue, and those on segments seven to twelve inclusive, are 

 red. All the tubercles and retractile tubercles are of the 

 same form, and arranged the same as in the last two stages ; 

 the spines and hairs are also like those in the preceding 

 stage. The fleshy, retractile tubercles on the dorsum of 



