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green, thickly dotted with black ; body rather elongated, tapering 

 somewhat posteriorly from the sixth segment ; back apple- 

 green, shading off laterally into pale blue, which is bounded by 

 a distinct bright yellow line just above the spiracles ; next to 

 the yellow line is a slightly broader line of pure white ; venter 

 and legs apple-green, assuming a slight bluish tint in the mid- 

 dle. Each segment above is covered with fine black points ar- 

 ranged in transverse rows ; on each segment are six minute 

 black tubercles, from which fine black bristles arise ; these 

 stand in the position of the points of equilateral triangles with 

 their bases forwards. The chrysalis is somewhat larger than that 

 of A. hyantis, and the long palpi-case is bent around backwards 

 into a sickle-shape, giving the pupa a remarkable appearance. In 

 many particulars of shape the pupa is not unlike that of Terias 

 nicippe, and I believe that this species is the nearest to Terias 

 of all our Anthocharis. 



I will give a brief description of the larva which I suppose 

 to be that of P. occidentalis ; it is certainly a Pieris, and can 

 hardly be any other species than this. 



Head black with white dots ; collar distinct, whitish ; body 

 striped transversely with yellow, black and white, the yellow 

 predominating. In the middle of each segment (except the 

 second and third, where it is obsolete), is a narrow black cross- 

 line, sometimes faintly lined with whitish in the middle ; this 

 black line terminates just above and behind the spiracles, and is 

 surrounded by white, thus giving dorsally two white cross- 

 stripes. In front of the anterior white stripe of each segment 

 is an irregular blotched stripe of black, consisting of a median 

 rounded dot, a constriction on either side, and an irregularly 

 triangular spot, with blunt apex forwards, reaching the seg- 

 mental fold. The rest of the back and sides of the caterpillar 

 is bright yellow, except a sub-spiracular band of irregular black 

 blotches just above the prolegs. The chrysalis is black with a 

 few lighter points. 



This caterpillar is found with those of A. hyantis^ but is 

 much more subject to the attacks of ichneumon-flies, so that I 

 obtained but two chrysalids and no perfect insects, although I 

 must have taken altogether more than a dozen of the young 

 larvas. Theodore L. Mead. 



