PACKARD. — TRANSFORMATIONS OF SATURNIAN MOTUS. 549 



liiirli as thick. The median tubercle on the 8th abdominal secfraent bears 

 twelve setae arranged six on each side of the crown ; those on the 9th 

 se<;meut with four large setae. 



Suranal plate with two large erect tubercles from a third to a half 

 smaller than those on the 9th segment, and bearing five large, long, and 

 five finer setae ; farther back near the end are two small low tubercles 

 bearinor from two to three coarse, and two or three finer bristles. Anal 

 leixs with setiferous tubercles on the hind edge. 



The body is uniformly deep ochreous yellow. The 1st thoracic seg- 

 ment is Prussian or dark steel blue, but yellow on the hinder edge, with 

 a yellow spot on the side, or the segment may be all yellow except around 

 the base of the tuberrles ; the other segments are yellow. Suranal plate 

 and anal legs of a rich dark steel blue. On the front edge of each seg- 

 ment (thoracic 2-3 and abdominal 1-8) there are three dorsal triangular 

 black-brown spots which are usually connected by a black line along the 

 suture ; behind these spots on each segment is a similar black line dilating 

 into three triangular spots which vary in being either connected or sep- 

 arate. Spiracles dark, on a dark ground. Both thoracic and abdominal 

 legs black; under side of the body blackish. 



In this stage the markings are much as in C. promethea, i. e. the two 

 transverse black bands, but they are farther advanced or more specialized, 

 and the head is without the transverse pale band in front ; the protho- 

 racic and other tubercles are the same. They are of the same general 

 proportions, but in color C. calleta is darker, especially beneath, and on 

 the suranal plate and legs calleta has longer bristles. 



End of Stage II. When about to moult (May 26) it is 23 mm. in 

 length. The head in ray example was very small, and is just as de- 

 scribed in Stage II, but with traces of another yellow spot. At this 

 time the body is much less spotted and marked with black-brown. 

 The 1st thoracic segment is ochre-yellow, with four irregular black 

 spots along the hinder edge, while the area around the base of the four 

 tubercles is blackish. All the tubercles are smaller in proportion to the 

 body, but preserve the same proportion to each other as in the beginning 

 of Stage II ; the body being larger, the tubercles are wider apart. 



Each segment behind the 1st thoracic with two series of three blackish 

 triangular spots, the middle one in front triangular and longer than the 

 lateral ones (as in the early part of the stage). The one corresponding 

 to it on the hinder line (which is half-way between the dorsal tubercles 

 and the hinder edge) is transversely linear ; the spots vary in being 

 either separate or connected ; they are smallest on the 8th and 9th 



