THE CANADIAN ENTOMOLOGIST. 



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on the inner margin and grayish on the outer margin with a dot near 



the middle, a spot near each angle and several 

 longitudinal streaks along the hind margin dark 

 brown. The hind wings of the male are brown- 

 ish or dirty white, those of the female dusky 

 brown ; the body is light brown, the thorax 

 p,v n of a darker shade. 



The female deposits her eggs in a cluster on the under side of a leaf 

 during the month of July, where they shortly hatch into tiny caterpillars, 

 which at first consume only the substance of the under side of the leaf, 

 leaving the upper surface unbroken, but as they increase in size they 

 devour the entire leaf. When not eating they lie closely together on the 

 twigs and sometimes entirely cover the branches they rest on ; they attain 

 their full growth during August or early in September. When mature the 

 larva presents the appearance shown 

 in fig. Id. Tlie head is coral red 

 and there is a lump on the back on 

 the fourth segment of the same 

 color ; the body is traced length- 

 wise by lines of black, yellow and 

 white, and has two rows of black 



Fig. 



spines along the back, and other shorter ones upon the sides from each 

 of which there arises a fine hair. The hinder segments taper a little and 

 are always elevated, as shown in the figure, when the insect is not crawling. 

 It measures when full grown about one and a quarter inches long. 



They entirely consume the leaves of the branch on which they are 

 placed, and when these furnish insufficient food to bring them to maturity, 

 the adjoining branches are laid under tribute. When handled they dis- 

 charge from their bodies a transparent fluid of a strong acid smell, which 

 doubtless serves as a defence from their enemies, especially birds, since 

 their habit of feeding openly in large flocks renders them particularly 

 liable to attack from these active foes. 



When full grown they all disappear about the same 

 time, descending from the trees to the ground, where they 

 conceal themselves under leaves upon or slightly under the 

 earth. Here, after a long time, the larva changes to a 

 brown chrysalis, fig. ii, and remains in this condition until 

 late in June or early in July of the following season. They are very 



Fig. II. 



