13 



A young- larva is shown in figure 1, at d, and an enlarged abdominal 

 segment of the same in profile at e. 



The full-grown larva. — The larva when mature is of striking appear- 

 ance owing to the beautiful bluish-green color of the body. It is 

 of robust cylindrical form, about five times as long as wide when 

 extended, widest at the middle and tapering rather feebly till near the 

 anal extremity. The general color of the body is glaucous or light 

 sea-green (near verdigris green of Ridgway's nomenclature). The 

 body is deepest in color, nearly blue on the ventral surface and in the 

 thoracic region. The dorsal portion of the abdominal segments is 

 darker and strongly marked as with an overlay, with dull carneous or 

 pinkish. Segmentation is rather strong and the thoracic and abdom- 

 inal folds are pronounced. The surface is rather sparsely clothed 

 with rather long yellow hairs, short on the head and legs and longer 

 elsewhere. 



The head is a little less than half the greatest width, rather dark, 

 nearly uniform moderately shining brown in color, becoming black 

 near the trophi; inverted V-mark elongate, distinct. The first tho- 

 racic segment is a little narrower than the second and third; thoracic 

 plate strongly transverse, moderately shining' olive brown. Thoracic 

 spiracle encircled with black; just anterior to this and a little below it 

 is a small yellow chitinous patch of sub triangular shape, the apex 

 directed obliquely slightly downward toward the head. 



The first eight abdominal segments bear each a minute rounded 

 piliferous wart on the side, smaller than, and located just above, the 

 stigmata. Stigmata encircled with black. Last abdominal or anal 

 segment strongly divided transversely, giving the impression of an 

 extra segment. Anal shield weakly subtriangular, with the base 

 rounded and the angles obtuse; color rather pale yellow, with mar- 

 gins marked with four fine black spots arranged like the corners of a 

 rectangle. The three pairs of thoracic legs are well developed, as are 

 also the four pairs of abdominal and the anal prolegs. 



Length when full grown and extended, 21-22 mm. ; width, 1.2 mm. 



The mature larva is shown in profile in the accompanying figure 1 

 at/. 



After the larva has spun its cocoon and is prepared for hibernation 

 it undergoes a shrinkage, to about a third the size before its construc- 

 tion. Segmentation has become still stronger, and the body is now 

 widest at the first and second thoracic segments. The colors have 

 grown duller, the ground hue being green without the bluish tint. 



The pupa. — The chrysalis or pupa is of robust proportions, and pre- 

 sents no characters worthy of special remarks. The color is rather 

 dull olive brown, and the surface is moderately smooth and feebly 

 shining in most portions except the wing-pads. These latter are nearly 

 opaque, dull olive green, and reach in front to the bottom of the fifth 



