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ENTOMOLOGICAL SOCIETY OF ONTARIO. 



the female emerges from the chrysalis (Fig. 44), on trees, fences, stone walls, etc. They 

 are mostly laid about the middle of July, and do not hatch until the following spring. 

 Both the egg-laying and the hatching of the young caterpillars are very irregular, so that 

 the insect may he found active throughout the season. The caterpillars (Fig. 45), although 

 extremely voracious, take a long time to complete their growth. When full-grown, they 

 are nearly two inches in length, and although gaudily marked when examined closely, 

 they are nevertheless inconspicuous when at rest on trees. " The general colour of the 

 body is creamy white, thickly sprinkled with black. The ground colour shows in the 

 dorsal and lateral lines which are somewhat broken. The tubercles on each side of the 

 ■dorsal line from the second to the sixth inclusive are blue and give rise to short black 



Fig. 45. — Gypsy moth, caterpillar. 



opines. On each side of the remaining segments, except the last, the tubercles are dark 

 crimson. On the top of the tenth and eleventh segments, on the dorsal line is a small 

 cylindrical fleshy tubercle without hair or spines, the top of which is slightly inverted. 

 It is uncertain what is the function of these organs, but it is quite possible they are 

 scent organs." 



" On the posterior edge of the last segment are four bluish-white tubercles giving 

 rise to black spine-like hairs. The spiracles are oval, pale yellow, and encircled with 

 black. The legs are dark crimson and the pro-legs flesh-coloured and streaked with 

 reddish-brown." — [Fernald.) 



There are other but less conspicuous markings, which it is not necessary to men- 

 tion here. When full-grown, the caterpillars epin a small quantity of silk and change 

 to the chrysalis condition. This usually occurs in July or August, and in Massachusetts 

 the insect remains in this state from eight to twelve days. 



Fig. 46.-- Gypsy moth, male. 



Fig. 47. — Gypsy moth, female. 

 The male (Fig. 46) and female (Fig. 47) moths are very dissimilar in appearance. 

 The former measure from one and a half to two inches across the expanded wings. The 

 -ground colour of all the wings is brownish-yellow, varying in intensity in different 

 examples. The head, thorax and antennae are grayish-brown. The wings are crossed 

 by about four waved black lines which are darkest on the costal edge of the wings. 

 The terminal space is also darker than the rest of the wing, and the fringe is cut with 

 dark brown between the veins. The males fly easily, in which they differ from the 

 ffemales, which can only fly down from an elevation. 



