Packard] O'^ [Feb. 3, 



setae, which on the average are about three-fourths as long as the tuber- 

 cles ; the first (mesothoracic) pair are as large as the second and third, all 

 being alike in shape, length and size (Fig. 1). 



Succeeding the three pairs of large high tubercles are five pairs (on seg- 

 ments 2 to 6) of tubercles which greatly contrast in size with those at 

 each end of the body, being very much smaller, only about one third as 

 high as the others, or about one-half as liigh as the others are thick in 

 their middle. On the end of the body are three pairs of large tubercles, 

 the first pair of these (on abdominal segment 7) being larger and thicker 

 than those on the thoracic and first abdominal segments ; those of the 

 pair on the eighth segment are about as large as the pair in front, but those 

 on the last pair (on the ninth segment) are about one-half as large and 

 long as those on the eighth segment. They all bear only three setae each. 



The setae or hairs appear under a half-inch objective to only taper like a 

 simple seta, the tip, however, not being acute, neither very blunt ; but 

 under a higher power (^ obj. A. eyepiece), the points are seen to be 

 divided or forked, but with only two divisions. Fig. 2 represents a 

 tubercle highly magnified, showing the finely forked glandular setse, each 

 of which is moved by a retractor muscle {m). 



Larva. Stage II. — Length, 5 mm. The three anterior pairs of tubercles 

 are paler, the largest (hinder) thoracic pair much darker reddish purple. 

 Between tlie first and second dorsal pair of tubercles are two parallel dorsal 

 rows of three pale dots, forming two short parallel broken lines. A yel- 

 low spot between the two larger tubercles, and in front is a fine trans- 

 verse tine connecting two yellow dots, and a similar smaller mark behind 

 the yellow spot. Threesimilar marks, i. e., a yellow median spot and two 

 transverse lines at the base between the abdominal tubercles. The brown- 

 and-vvhite edged lines nearly enclose each set of tubercles as before. 

 The body is green and straw or lemon color above, and greenish amber 

 low down on tlie sides.* 



Stage III{'i). — (July 23.) Length, 6 mm. The ten anterior fleshy ap- 

 pendages are all pale lilac ; those in front the paler ; the second dorsal 

 pair about one-third larger than the first pair, and the third pair about 

 one-third larger than the second, and nearer together at their base ; the 

 latter are deeper purple, and are dark at the end. The large pair near 

 the end are al^o purple, and only slightly larger than the second anterior 



♦Miss Mullffldt thus describes the young, probably in Stage 11, as she observed them 

 at St. Louis : " Late in August of tlie preseut year I found quite a colony, probably ten or 

 twelve, on a single leaf of the above-mentioned tree. They had but recently hatched, 

 but tiny as they were — not more than an eighth of an incli in length — tliey had all the 

 titberrlcs and other characteristics of the mature larva, except that tlie saddle-cloth-like spot 

 was deep yellow instead of green and the central dorsal spot pinkish gray. They had 

 perforated the leaf with small irregular lioles. Not thinking that they would readily 

 loosen their hold on the leaf. I carried it carelessly in ray hand, and when I reached the 

 house was much disappointed to find that but two larvse remained on it. As these 

 thrived and perfected their development to the point of enclo.sing themselves in cocoons, 

 it is evident that maple may be included in the list of their food-plants" {Bull. Biv. 

 Enl., 13, G3). 



