ANTHOCHARIS I. 



and afforded a firm support (7 magnified). I have not noticed this peculiarity in 

 the shape of the button in any other species. It woukl be useful, considering 

 that nearly a year must pass before the butterfly will issue. Immediately after 



the skin dropped the thorax was a little prominent (4) — no indication of this 

 had been given by the larva — and it enlarged almost imperceptibly, while the 

 dorsum remained arched. This was the attitude up to fifteen minutes. At 

 twenty the depth of thorax was .14 inch ; the process .1 inch long, .03 wide at 

 base, partly raised, semi-translucent (being hollow, a thin shell), not yet rounded 

 (5) ; the abdomen and all the dorsum still retained the larval colors, even to the 

 yellow band, every tubercle and spot having its corresponding pale black spot 

 or point ; the wing cases and under side of head and the process dark brown. As 

 the depth of the thorax increased the girdle was tightened, and the dorsum bent 

 in; and when at thirty minutes the projection touched the stick the dorsum was 

 bent in at an angle which fell a segment below the girdle. The pupa had thus as- 

 sumed its final shape (6), the process meanwhile having straightened, and rounded, 

 becoming .18 inch long and .06 broad at base. The depth of thorax was now .17 

 inch. At about twenty-four hours the pupa had assumed its final colors, losing 

 the resemblance to the larva. Fig. 1 represents the attitude of the larva for a 

 time before pupation began. 



