430 ANNUAL REPORT OF NEW-YORK 



CURRAXT. LEAVES. 



distinctly point it out hereafter to every one into whose hands it 

 may come. 



The larva is gray with two or three deep transverse wrinkles at each suture, 

 the bottoms of which wrinkles are black and their summits whitish. On the 

 fore part of each of the abdominal segments is a whitish band which on each 

 side is interrupted by two oblique black spots. Each of these segments also 

 has a pale tawn}' yellow spot above the breathing pore and a smaller one below 

 it, with prickles placed in each of these spots. The head is white with black 

 dots, and is very rough from Lumerous short white spines of different sizes, 

 and placed upon its summit are two black prickles with numerous branches 

 which are mostly white with black tips. The two upper prickles upon the 

 second ring are also black like those upon the head, those upon all the other 

 segments are white, mostly with black tips, their branches white, towards the 

 forward end of the body becoming tipped with black more and more. The first 

 ring or neck is destitute of long branching prickles and has only a belt of short 

 spines around its middle, similar to those covering the head. A few similar 

 spines also occur upon the sides of the following segments and on the outer 

 face of the pro-legs. The legs and pro-legs are dull pale reddish, their outer 

 sides black. The mouth is dull reddish and the under side of the body white 

 mottled with brownish dots and short lines. 



From this description it will be seen that in its larva as in its 

 perfect state this species is intimately related to the White-C. The 

 Progne however has but one brood each year, the butterflies 

 appearing in the month of July. The two larvae which were 

 sent me were found on the morning of June 29th to have cast 

 their skins and assumed their pupa form the preceding night, one 

 of them suspending itself from the stalk of a leaf, the other 

 attaching itself to the side of the net in which they were inclosed. 

 And on the morning of July 11th both were found changed to 

 butterflies, the pupa state thus lasting but twelve days. Dr. 

 Harris reports having obtained a Progne butterfly so late as the 

 eighteenth of August, its pupa state having continued but eleven 

 days. The few instances in which I have met with this butterfly 

 have all been in the month of July. 



The PUPA is 0.80 long and of a gray color with obscure olive clouds. It has 

 a deep excavation across the middle of its back in which on each side of the 

 middle is a burnished silvery-golden spot and outside of these spots is a black- 

 ish streak at the margin of the wing-sheaths. On the opposite side of the body 

 and above this excavation is another similar excavation, at the base of the ven_ 

 ter and tips of the antennae-sheaths — these excavations giving to the pupa a 

 very humped and deformed appearance A broad dusky olive stripe in which 



