568 PROCEEDINGS OF THE AMERICAN ACADEMY. 



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 8th abdominal segment 



are also dark. 



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



Stage V. It moulted 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 Hue 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 seg- 

 ments beino- shallow. The tubercles are distinct, but of uniform size, 

 and about as high as thick, bearing seven rather stiff setae, one rising 

 from the centre ; the setae of tlie lateral tubercles are twice as long as 

 the dorsal ones. Behind the tubercles each segment is crossed by two 

 transverse impressed lines. On the 9th abdominal segment a few of the 

 radiating setae 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 mid-abdominal 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 ; mid-abdominal legs yellow ochre, like the 

 under side of the body, but above the planta greenish-yellow. 



Stage VL It moulted for the fifth time June 12-13. 



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



Tlie head is now entirely hlach, except tlie base of the labrum. The 

 sides of the body (what before was straw-yellow) are now all black, this 



