PACKARD. TRANSFORMATIONS OF SATURNIAN MOTHS. 563 



yellowish, of the same hue as the skin. The lateral series of tubercles 

 are turquoise-blue, as before. On all the tubercles the setae are black, 

 and shorter than the tubercles themselves are high. 



The two dorsal tubercles on the front edge of the 1st or pro thoracic 

 segment are as large as those on the 2d thoracic segment, while those on 

 the 3d thoracic segment are nearly twice as high as thick, also slightly 

 smaller than in Stage III. Each bears six black setae, and an odd 7th 

 bristle in the centre. The setae are not quite so long as the tubercles 

 are thick. 



The dorsal tubercles on abdominal segments 1-7 are now small, 

 slender, scarcely half as high as the two on the 3d thoracic segment, 

 and evidently undergoing reduction ; each bears three setae of unequal 

 length, two of which are short, and one generally longer, though they 

 vary in length, the longest one being about as long as the tubercle is 

 hish. There are six setae on the medio-dorsal tubercle of the 8th 

 abdominal segment. 



Suranal plate with a rather stout turquoise-blue tubercle on each side 

 near the middle, each bearing seven short black setae ; end of the plate 

 armed with five small setiferous tubercles, and an irregular row of black 

 setae on the edge of the anal legs. 



The tubercles of the supraspiracular row are minute, yellowish, and 

 not quite twice as long as thick. 



In the few reared by Mr. Joutel the larva? were all alike, no matter 

 what their color was in the previous stages. 



Stage V. and last. Unfortunately my single larva died before as- 

 suming its final stage of growth, and I shall have to depend on Mr. 

 Joutel's drawing for the following description. Up to this stage the 

 caterpillar was in all its stages a remarkably striking and exquisitely 

 beautiful one, especially in Stages III and IV, where the tubercles were 

 of such a soft and delicate turquoise-blue, contrasting so markedly with 

 the yellow or green hues of the body. 



Length, when at rest, head down, 63 mm. ; when extended in the act 

 of walking, 78 mm. The body is now thick and fleshy, destitute of 

 tubercles with the exception of the two medio-dorsal ones on the 3d 

 thoracic segment, and the medio-dorsal one on the 8th abdominal seg- 

 ment, otherwise the body is entirely unarmed, with apparently no traces 

 of the tubercles present in the previous stages. The tubercles on the 3d 

 thoracic segments arc ( united into one), stout conical, nearly twice as high 

 as thick at the base, and with a conspicuous dark spot in front. When at 

 r< I. head down, this horn projects up in a very Conspicuous way. The 



