124 THE ENTOMOLOGIST. 



both head and general area were thickly covered with tubercles 

 and spines, the tubercles in the general area being white in 

 colour. The dorsal area between the subdorsal stripes was 

 slightly narrower towards the head, and considerably more so 

 towards the anus. The light spiracular line was narrow. 



In this stage the larva ate the whole of the clover-leaf away, 

 leaving the midrib only. On August 11th it ceased feeding pre- 

 paratory for the next change ; it was then 13 millim. in length, 

 and stout for its length. The spiracular line was now much 

 more prominent, white, and tinged towards the anal extremity 

 with orange ; the spiracles were brown, the subdorsal lines 

 cream-colour ; the general area green, of the colour of a clover- 

 leaf ; the head was lighter and duller green, the spines on it 

 were black. 



The larva changed into the fifth and last instar on August 

 12th ; immediately this occurred it was 13 millim. in length ; the 

 head was now of the same green colour as the clover-leaves ; the 

 remainder of the segments were very dark moss-green, with the 

 white spiracular and light yellow subdorsal stripes showing 

 much more prominently than in the previous stages ; it was 

 thickly covered with white tubercles emitting black spines. The 

 spiracles were now light crimson, especially those nearest the 

 anal extremity. During this stage the subdorsal stripes were 

 red on the upper sides, except for a few segments next the head, 

 on which they were yellow ; these tints were caused by the 

 tubercles in the upper portion of the stripes being red or yellow 

 respectively. The spiracular stripe was tinged with light crimson 

 on the lower border from end to end ; neither subdorsal or spi- 

 racular stripes extended through the anal segment; the spiracles 

 were brown. 



In this stage the larva grew with great rapidity, and on 

 August 15th it had increased in length to 23 millim. ; the width 

 was then 4 millim. The colour was still moss-green, but of not 

 so dark a tint as when last described. The subdorsal stripes 

 were now red on the upper borders for the whole length. 



On August 17th the larva had attained a length of 26 millim., 

 and was then apparently full-grown. On this day it ceased to 

 feed, and remained stretched out at full length upon its food, 

 evidently being prepared to hybernate, had its natural conditions 

 been obtained. Unfortunately, I could not manage to bury it 

 for the succeeding nine months under several feet of snow, and 

 keep the surrounding temperature many degrees below freezing- 

 point. The best I could do was to place it on a piece of muslin 

 in an airy cage and keep this in a cool cellar. Under these 

 conditions the larva remained quite quiescent, and gradually 

 decreased in size, until at the end of September it was only 

 13 millim. in length. 



On December 18th it was apparently healthy, and had not 



