118 



The fourth molt occurs nine days after the third, and the length is 

 then nearly an inch. The head is pale primrose mottled with dark 

 brown, and has a large brown spot on each side of the centi'al line, 

 and another on each side of the clypeus, at the base. A few light 

 brown hairs are scattered over the surface. The general color of the 

 upper side of the body is velvety black sprinkled with white. The 

 tubercles on each side of the dorsal line, on the second, third, fourth, 

 fifth and sixth segments are larger than in the last molt, and of a 

 French blue color. Below the lateral lines the surface is sordid 

 white mottled with black. The tubercles above and below the stig- 

 matal lines are dark yellowish, and from those above the stigmatal 

 line arise dark brown hairs, while from those below the line the hairs 

 are light brown. The under side of the body, and the legs and 

 prolegs are dark brown. 



The fifth molt occurs in nine days after the fourth, when they are 

 from one and one-eighth to one and one-half inches in length. The 

 head is of a creamy buff color, thickly mottled with daik velvety 

 brown, leaving the light ground color showing along the middle line 

 on top, and two stripes on each side, as in plate I, figs. 6 and 7. 

 The antennae are pale yellow ; mandibles, dark brown ; clypeus much 

 depressed, and of a very pale orange color, the labrum or upper lip 

 white with a few pale yellowish hairs scattered over the surface. 



The general color of the body is cream white thickly sprinkled 

 with black. The ground color shows in the dorsal and lateral lines 

 which are somewhat broken. The tubercles on each side of the dorsal 

 line, from the second to the sixth inclusive, are blue and give rise to 

 short black spines. On each side of the remaining segments, except 

 the last, the tubercles are dark crimson. On the top of the tenth and 

 eleventh segments, on the dorsal line, is a small cylindrical fleshy 

 tubercle without hairs or spines, the top of which is slightly inverted. 

 It is uncertain what is the function of these organs, but it is quite 

 possible they are scent organs. On the second and third segments, 

 on the lateral and stigmatal lines, is a reddish yellow tubercle giving 

 rise to yellowi&h hairs and black spines ; andon'these same segments, 

 on the stigmatal line, is a tubercle similar to ihe above, which gives 

 off long j)ale yellow hairs and a few black spines. On each of the 

 remaining segments, on the stigmatal lines, are two reddish yellow 

 tubercles joined in one, the upper giving off black hair-like spines, 

 and the lower, black spines and yellowish hairs mixed. There is a 

 row of reddish yellow tubercles, on the sub-stigmatal line, which 

 2 



