no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 229 



yellow, become afterwards dusky greenish, while those of abdominal segments 1 to 7 are lemon- 

 yellow; all give rise to black bristles, the longer of which are about twice as long as the tubercles 

 themselves, being much longer than in the other Attacinte of the same stage, while the tubercles 

 themselves are smaller in proportion. The thoracic tubercles bear seven or eight, and the 

 abdominal six bristles, one of which is often longer than the others. 



The body is lemon yellow, very conspicuously banded crosswise with black. The prothoracic 

 segment is yellow ; dusky along the front edge ; or yellow with one or several black spots ; on the 

 hinder edge is a broad black transverse band ending on the lowest lateral tubercle, which is 

 yellow, and a little larger than the dorsal ones on the same segment. The front and hinder 

 edges of each succeeding segment of the body are black. The anal legs have a large black spot 

 on each side. The three tenant setae on the thoracic feet are broad and lancet-shaped, and 

 there are 16 crotchets on the abdominal legs. 



The single median tubercle on the eighth abdominal segment is evidently double in its 

 origin, being twice as broad as long at the base, and there is a median space between the two 

 sets of setae, there being two tops or crowns, from each of which arise five setae; and it is larger 

 than the others, its greatest diameter being the transverse one. This and the two dorsal and 

 lateral tubercles on the ninth and tenth segments (suranal plate) are dusky or blackish green, 

 and are of the same hue as those on the thoracic segments, and they are a little larger than those 

 on abdominal segments 1 to 7, those being yellow. All the bristles are jet-black, and there are 

 none of any other color. They are finely spinulated, the spinules rather dense; they taper to the 

 acute end, and are clear and probably glandular. It is to be noticed that the body is trans- 

 versely banded with black; that the dorsal tubercles of the three thoracic and the last two 

 abdominal segments are already in this stage differentiated in color and size from those of the 

 first seven abdominal segments; indeed, the larva is much variegated, being showily banded, 

 with great contrasts of color. 



Mr. Bridgham's specimens of stage I were observed on July 15, and were fed on the sassafras 

 and wild cherry. The second stage was drawn on July 23. 



Stage II. Length, 10 to 12 mm. The head is not quite so wide as the body behind the 

 middle, being much smaller in proportion to the body than before; it is black, with a sinuous 

 broad conspicuous whitish (not yellow as in stage I) band passing across the clypeus, so as to 

 include the apex, and curving down toward the antennae. The ground color of the body is 

 whitish instead of yellowish, so that the transverse black bands, though narrower, are more 

 conspicuous than before. On the first thoracic and ninth abdominal segments are two dorsal 

 and two lateral black tubercles, one- as in stage I but on all the other segments except the tenth 

 abdominal the tubercles are now yellowish with black spines; all the tubercles are situated 

 on the white portion of the body, the black bands being situated between them. The single 

 median tubercle on the eighth abdominal segment is now yellowish, and distinctly seen to be 

 double, being very broad, and each side provided with a crown of about five spines. There are 

 five or six spines to each tubercle, and many are blaelc, and much shorter and stouter than in the 

 previous stage, the outer ones being about as long as the tubercles bearing them are high, the 

 central inner one longer. The round black spot on the side of the anal leg differs from that in 

 stage I in being curved, boomerang-shaped. The thoracic legs are black, and the abdominal 

 ones pale yellowish. In this stage the dorsal tubercles on the second and third thoracic segments 

 are of the same size and color as those of abdominal segments 1 to 7; the differentiation in size and 

 color of the four thoracic tubercles having not yet taken place. It is to be observed that in stage I 

 the dorsal tubercles on all these thoracic segments are black, and the median one on the eighth 

 abdominal segment is also black. 



Bridgham's figure and Riley's specimen, from which the foregoing description has been 

 drawn up, agree with Riley's description. 



Figure 28 represents a dorsal view of the last four abdominal segments (VII-X) with the 

 medio-dorsal tubercle (d') on the eighth uromere (VIII), bearing 10 setae, two of them arising 

 one on each side of the median line: a. a seta from one of the dorsal tubercles on the ninth 



