286 THE CANADIAN ENTOMOLOGIST. 



After the first moult the females are about .625 mm. in length, .3 mm. 



in width ; bright orange in colour, somewhat rounded at the anterior and 



posterior ends. 



The antennae are .19 mm. long, and have seven segments. The basal 

 segment is quadrangular in outline and quite short. The seventh is the 

 longest, being nearly as long as the three preceding taken together. 



It is difficult, if not impossible, to separate the first and second 

 nymphal stages, except by rearing them and noting the time of moulting. 

 The characters of length and size of the antennae are of doubtful value) 

 and not to be depended upon. The antennae of a nymph, near the latter 

 part of the first stage, measured over .19 mm. This is the length usually 

 found in the nymphs at the beginning of the second stage. 



Third Nymphal Stage. 



The second moult occurs, on the average, about 15 diys after the first. 



« 



The antennae now consist of eight segments, and are .26^ mm. in 

 length. The basal segment is quadrangular in outline, and the eighth is 

 nearly as long as the three preceding taken together. The character and 

 the number of the antenna! segments readily distinguish this stage from 

 the preceding ones, but are absolutely of no value in separating it from the 

 mature or last stage. In other characters they do not differ materially 

 from those of the preceding stages. 



As all previous workers have considered the antennae in the first 

 nymphal stage as consisting of only six segments, I would like to draw 

 attention to the fact that in all specimens which I have examined there 

 were seven clearly-defined segments in the first and second nymphal stages 

 and eight in the third, as well as in the adult female. 



Adult. — Female." 

 The third and last moult takes place, on an average, about 13 days 

 after the second. I found it very difficult to secure many observations on 

 the exact time of this moult on account of the roving habits of the nymphs 

 under observation. 



After this moult the females do not usually move about, but remain 

 practically motionless. Egg-laying commences in from 15 to 20 days 

 later, and continues for from 10 to 14 days. An interesting observa- 

 tion worth recording is that the females are usually not of uniform size 

 at the time when they commence egg-laying. This has been pointed out 

 by Reed in his thesis, and I had many opportunities of verifying his 



