Packard,] 10^ [March 17, 



Stage V and last. — Length, 35-38 mm. (Jewett says from two to 

 two and a half inches when fiillj' grown). The head is now not anguhir 

 but rounded, thougli slightly narrowing and produced above ; dark pea- 

 green, considerably darker than tlie body ; with a broad yellow band 

 beginning on the antennae and foding out on the vertex. The ocelli are 

 black ; the mandibles black ; the anterior lobes of the labrum brown, 

 including the palpi. The head is about two-thirds as wide as the body, 

 the surface covered with line minute granulations arranged in groups 

 (only seen under a strong Tolles lens). 



The body is thick ; the prothoracic segment short, and not so wide as 

 the second thoracic segment. It is unarmed, its front edge with a trans- 

 verse series of white bead-like warts set close together. Behind, the 

 body is thick, being of the same thickness as far as the eighth abdominal 

 segment. Second and third thoracic segments each with two pairs of 

 very large spines which are about two-thirds as long as the body is thick ; 

 the outer one of each pair is slightly shorter and slenderer than the inner, 

 but those of both pairs are alike in size ; they are roseate, pale coral-red 

 and not so near iti tint to the spines of the food-plant as in the young ; 

 when the caterpillar is at rest tliey are held close together in a recurved 

 position and in the grown-up larva when touched they are not moved or 

 the body jerked in response to such stimulus. They are adorned with 

 •white blunt spines, which are often tipped with black. 



"The ' silver horns' on the fifth to the tenth segments are now one- 

 sixteenth to one-eighth of an inch long, bright pink inside and burnished 

 silver externally. The number of these 'silver horns' varies in different 

 larvae, some having them only on the seventh and ninth segments ; 

 others have them on the fifth, seventh and ninth segments ; still others 

 have them on the fifth, seventh, ninth and tenth segments " {Papilio, ii, 

 49). "I have now to add that this year I reared three larvae having these 

 silver horns on every segment except tiie twelfth ; still the imagines from 

 these three larvae did not differ from the ordinary form " (Jewett, Papilio, 

 ii, 144). 



The horn on the eighth abdominal segment is now only about one- 

 fourth shorter and thicker than the thoracic spines, and is of the same 

 color and structure, the spiuules being conical, rounded, blunt, white, and 

 bearing a fine bristle. 



On abdominal segments 1-7 are two dorsal rows of acutely conical 

 spines, which are recurved and directed backwards. Those on the fourth 

 and sixth segments are twice or thrice as large as those on the other seg- 

 ments (1-3 and 4 and 7) and provided with three or four blunt spinules ; 

 the spines themselves are roseate on the inner side, and externally bril- 

 liantly painted with a pearly silvery white, giving off all the colors of the 

 rainbow during the movements of the animal. The corresponding spines 

 on the other segments are painted in the same fashion though less bril- 

 liantly. 



On the side of the body from the third thoracic horns to the eighth ab- 



