44 THE CANADIAN ENTOMOLOGIST. 



mesothorax black ; beneath, the colour of the abdomen is a light olive 

 green ; the antennae and Legs are dusky brown to blackish ; on either side 

 of the abdomen, opposite the cornicles and beneath the lateral margins of 

 segments 5, 6 and 7 is a heavy tuft of white cottony secretion. This 

 cottony secretion, apparently, is not formed on any other portion of the 

 body, or by any other of the lice. Length of body 1.50 to 1.70 mm.; 

 length of wing 2 mm.; antenna varying from .65 to .85 mm.; third joint 

 longest and almost exactly equal to joints 4 and 5 combined ; joint 6 with 

 its short unguis equal to or slightly longer than either joint 4 or 5. As in 

 case of the stem-mother, the joints are distinctly covered everywhere with 

 very short stout hairs or points. On the terminal joints these minute 

 points are arranged in more or less distinct annulations. Joint 3 has 

 about 15 transverse tuberculate sensoria ; joint 4 two to five similar 

 sensoria ; legs distinctly shorter than in the viviparous form, the hind 

 tibia: measuring only about .51 mm. in length; veitex quite convex; 

 cornicles slightly raised above the surface, somewhat more prominent 

 than in the stem-mother ; cauda broadly rounded, scarcely elevated ; 

 anterior wings with three transverse veins, the third transverse vein being 

 twice forked ; the branch forming the second fork arises about midway 

 between the first fork and the tip of the wing ; stigmal vein moderately 

 curved ; stigma transparent, very short and hardly longer than broad ; 

 posterior wing with two cross nervures ; both wings hyaline; beak just 

 attaining second coxae. 



1 .ice that emerged during the night began depositing eggs by noon of 

 the following day. 



Viviparous Female. 



Differs from the oviparous form in having the legs longer ; tibiae of 

 hind legs measuring about .68 mm. This form also lacks entirely the 

 waxy secretion which forms upon the sides of the venter on joints 5, 6 

 and 7 in the oviparous form. 



Alate Male : Plate I, figs. 2 and 5. 



The male is much smaller than the females, and the general body 

 colour is light yellow. The compound eyes and the sides of the head in 

 front of them are black. The lobes of the mesothorax and scutellum are 

 dusky brown to black. In most specimens a distinct dusky V-shaped 

 spot occurs upon the dorsum of the head and one near either lateral 

 margin of the prothorax. Antennas and legs dusky yellow. Darker speci- 

 mens have the head largely dusky brown, and the antennas and legs dusky 



