60 Studies on Life-history of Bomhycine Moths. 



8th abdominal segment, giving a slightly humped appearance to 

 this segment, from which the body falls off to the anal tip. There 

 is no prothoracic shield. 



The rudimentary eversible glands are difficult to detect. I can 

 not with a Tolles triplet or \ in. objective detect them on the 6th 

 and Yth segments. They must be rudimentary and much smaller 

 than any of the tubercles and must be colorless. 



It will be observed that in this stage when the larvae are small, 

 they show none of the markings of the later stages, not needing 

 the danger signals, though they are undoubtedly thinned out at 

 this time by insects and birds. 



Stage II. — (Found on Wisteria, June I5th.) Length 5 mm. 

 Head not so wide as the body. Prothoracic segment very wide, 

 with two very large prominent lateral tubercles extending out as 

 far as the front of the head, and each bearing a short black pencil 

 which is not so long as the body is wide. Yellow hairs project 

 over the head from the front edge of the prothoracic segment; they 

 are unequal in length, the longest ones being nearly as long as the 

 worm itself. The body is blackish, the lateral black line of stage I 

 being vow very broad; connected by a black band on the hinder 

 edge of the prothoracic segment, while the end of the body is black 

 above and encloses the two retractile pale yellowish jyapillas. From 

 the 2d thoracic to the 5th abdominal segment extends an irregular 

 broad yellowish band ending in a broad squarish, yellowish patch, 

 free from papillag, and situated on the 5th abdominal segment. The 

 front edge of the 1st thoracic segment is luteous. The sides of the 

 body low down and beneath are greenish, with a faint yellowish tinge. 



Stage ///.—(Observed June Hth.) Length 6-7, and at end of 

 stage, 10 mm. It has now assvmed the characters of the last stage. 

 The head is at first amber-colored, afterwards deepening. There 

 are two dark pencils ^ as long as the body, and 4 white tufts, one 

 each on the first four abdominal segments. The two eversible 

 glands are now coral-red. A velvety-black dorsal baud extending 

 from and enclosing the white tufts to the end of the body. The 

 sides of the body are of a peculiar bluish-gray. A dense anal tuft 

 arises from the Sfh abdominal segment, giving rise to feathered hair.s 

 like those on the full-fed larva, but not so well developed. Most of 

 the other hairs are whitish, some of them dark. 



Fig. 2 represents the- end of a black plumose hair from a protho- 

 racic tuft in the last stage; a, a similar hair of stage III, showing 



