THE CANADIAN ENTOMOLOGIST. 195 



readily through it to get their prey, so tliat lack of food prevented me from 

 carrying to the first ecdysis more than six nymphs out of about fifty 

 secured from ova. Of tliese nymphs, two moulted in seven days, and one 

 each in eiglit, eleven, twelve and thirteen days respectively, the shorter 

 periods being in late June and August, the longer in early June. 



Second Instar. 

 Shape : Very like the first instar, except that the head is more 

 shaped and the eyes comparatively larger. The antennae are now 

 distinctly two-jointed and a little more slender, the basal joint being 

 about one-half as long as the second. The legs are as in the first instar, 

 except that the fringing hairs and spines are naturally better developed. 



Size : Long., 6 to 7 mm.; lat., 3.4 to 3.7 mm., measured from cast 

 skins and mounted specimens. 



Colour and Markings : As in the first instar. 



Only three survivors reached the second moult, one in seven, one in 

 five, and the third in six days. My further notes were all made from 

 three individuals. 



Third Instar. 



Shape : Much as in the preceding instars, except that the abdomen is 

 perhaps a little more rounded posteriorly. The head is still nearer the 

 adult form, with the eyes a little larger. The antenna? are distinctly three- 

 jointed in this instar, still club-shaped, and about twice as long as wide. 

 The wing-pads first appear in this instar. The legs and tarsi are not 

 changed, save that the smaller of the ungues of the anterior tarsal claw is 

 much reduced in length, being barely two-fifths the length of the other. 

 The fr'nging ciliae are thicker, and the tibiae of the third pair, near the 

 tarsal joint, have two parallel comb like rows of stout bristles. The 

 various spines on the legs are much stouter and better developed. 



Size : Long., 8.5 to 9 mm.; lat., 3 7 to 4 mm. 



Colour and markings continue much the same, except, of course, for 

 a deepening of the same due to the further stage of development. 



The survivors reached the third moult in seven, six and seven days 

 respectixely. 



The colour after casting off the outgrown integument is greenish 

 yellow, the stomach contents and viscera showing as a darker brownish 

 patch, through which the nearly black pulsating dorsal vessel runs. In 

 about six hours the colour changes to the mottled grayish already noted. 



