6Q PROCEEDINGS OF THE AMERICAN ACADEMY 



seems to be entirely smooth and shining, without any markings, with 

 neither pits nor polygonal areas, but after further observation very 

 faint, irregular, moderately large polygonal areas, with faintly raised 

 edges or boundaries, can be detected. Length 1.8, breadth 1.5 mm. 



The egg of C. anguUfera is the same as C. promethea in shape and 

 color, though mine are slightly smaller, and the polygonal markings 

 appear to be even fainter than in G. promethea. 



In the Attacina3 the eggs present generic, specific, and perhaps vari- 

 etal characters ; this of course depends on the structure of the lining 

 of the oviduct, and it may be asked what natural selection or the in- 

 fluence of external surroundings have to do with the differences in the 

 shape, structure, and markings of eggs. 



Larva, Stage I. — Described a few hours after hatching. Length 

 5 mm. The head is wider than the body in the middle, and as wide 

 as the prothoracic segment ; black, with a broad transverse whitish 

 band crossing the clypeus, including the apex and a large jDortion of 

 the clypeus itself, the labrum and base of the antennje pale. The 

 thoracic tubercles, at first lemon-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 

 Attacinae 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 setiB on the thoracic feet are broad 

 and lancet-shaped, and there are 16 crotchets on the abdominal legs. 



The single median tubercle on the 8th abdominal segment is evi- 

 dently 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 setfE ; and it is larger 

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

 and the two dorsal and lateral tubercles on the 9th and lOth 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 



