174 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xn, 



The oval flattened tubercles are scattered along just above the pleural swollen yellow line and 

 beneath on the under side, where they become straw-yellow. The tubercles of the ninth abdom- 

 inal segment bear setae which are mostly black or dark. The tubercles of the supraspiracular 

 row are prominent, but small, pale, and bear eight to nine short pale setae, with a very long 

 yellow one (sometimes two) arising from the center. Those of the infraspiracular row are about 

 twice as large as those of the supraspiracular series, and bear about nine seta? arising from 

 prominent warts, while the setae assume the shape of long uneven yellow hairs. 



The thoracic legs are black; the mid-abdominal ones pale greenish-yellow -with the plantae 

 reddish; anal legs large, broad, triangular, black, spotted in the center with yellow and with 

 yellow hairs around the edge, but none arising from the central portion. Suranal plate broad, 

 triangular, a little shorter than broad, roundish at the end, with setiferous white warts, the 

 hairs around the edges yellow ; two groups of seven to eight setae, one on each side near the edge, 

 arising from distinct warts; each group, representing a primitive tubercle, is situated a little 

 nearer the base of the plate than the end. 



The setae on the supraspiracular tubercles of the eighth abdominal segment are also dark. 



In this stage it is a rather conspicuous larva and a very beautiful one. 



Stage V: It molted again June 3. It is now a most beautiful larva. 



Length of body 35-40 mm. Width of the head 4-4£ mm. 



Head nearly as wide as the prothoracic segment, greenish straw-yellow, spotted with 

 brown, the sides brown; a V-shaped dark line in front, each side of the clypeus being black. 



The body of a beautiful tint of pearly greenish-white; the top of the body being broad 

 uniformly flattened, the sutures between the segments being shallow. The tubercles are 

 distinct, but of uniform size, and about as high as thick, bearing seven rather stiff setae, one 

 rising from the center; the setae of the lateral tubercles are twice as long as the dorsal ones. 

 Behind the tuberdes each segment is crossed by two transverse impressed lines. On the ninth 

 abdominal segment a few of the radiating seta? are blackish or entirely black. 



The body is very hairy for a Saturnian, being clothed with long pale whitish-yellow uneven 

 hairs, the longest nearly twice as long as the body is thick ; those on the side of the body bright 

 straw-yellow. The lateral ridge and the tubercles of the two lateral rows are straw-yellow. 

 Around the base of each infraspiracular tubercle is a reddish ring. 



The spiracles are large, conspicuous, of a rich delicate turquoise-blue. Around each 

 spiracle are several irregular small linear black spots and streaks, which are directed more or 

 less upward and broken up into dots. The thoracic segments are black on the sides low down 

 and on the under side. The separate warts on the sides of the body and on the outer sides of 

 the midabdominal legs are rather large. 



The suranal plate is rounded, as in the earlier stages, and with the anal legs spotted with 

 black, and clothed with short curly pale yellow hairs. 



Thoracic legs brownish; midabdominal legs yellow ochre, like the under side of the body, 

 but above the planta greenish-yellow. 



Stage VI: It molted for the fifth time June 12-13. 



Length of body 40 mm. ; width of the head 4^-5 mm. 



The head is now entirely black, except the base of the labrum. The sides of the body (what 

 before was straw-yellow) are now all black, this tint extending far above the blue spiracles. The 

 upper edge of this black region is irregularly dotted with white; the under side of the body is 

 also black. 



The top and middle of the prothoracic plate is white, divided into two halves by the median 

 line. The dorsal or upper side of all the segments to the end of the eighth abdominal segment is 

 cream-white. The tubercles are also greenish- white ; each bear six to seven long setae and one 

 or two central ones, which are greenish and as long as the body is thick. 



The suranal plate and anal legs greenish-yellow, with black dots and streaks. Thoracic 

 legs chestnut brown: midabdominal legs dark green with dark plantae. Mr. Joutel tells me 

 that some of his larvae had an extra stage. 



