394 THE CANADIAN ENTOMOLOGIST. 



basal half. The sensoria are ralher small, transverse and not much 

 tuberculate, and the sixth jonit tapers gradually into the seventh. Fronlal 

 tubercles for antennse large, vertex hardly convex, prothorax rather long 

 and rectangular in form, and witliout lateral tubercles ; cornicles .66 mm. 

 long, cylindrical and somewhat constricted near distal end. Terminal 

 joints of abdomen prolonged into a sort of short ovipositor (for deposiiit g 

 young). Cauda short, conical, upturned ; beak barely attaining 3rd 

 coxa?: length of hind tibia? 2.6 mm. 



These winged females are fairly common yet among oviparous females 

 and young upon the under side of leaves of box elder on college campus. 

 A very active louse with long legs, and it often jumps from the leaves 

 when disturbed. 



There seems to be no apterous viviparous form in this species. 



Apterous Oviparous Female (Plate 11, fig. 6). 



Described from specimens taken at Fort Collins, Oct. 18, '07, from 

 tlie box elder. 



In general colour varying from very light greenish-yellow to a sordid 

 or even dusky yellow, becoming darker with age. Antenna very pale 

 \ fcllovv, annulated with black as in winged form \ colour of legs and 

 cornicles and eyes as in winged form. The body of this egg-laying female 

 is very peculiar in having an extremely elongated ovipositor-like end to the 

 abdomen. The distance from the cornicles to the tip of the abdomen is 

 nearly one and one-half mm., or more than one third the entire length of 

 the body. Length of body, 3.8 nun.; lengtli of antenna 5.55 mm ; joints : 

 III 1.2, IV [.14.V [. I I, VI .20, VI 1 1. 71 mm. Length of hind tibiie 2. 22 

 mm. Cornicles cylindrical, gently curved, enlarged slightly towards the 

 base, and. 6, 5 mm. in length. Prothorax without tubercles; body set with 

 scattering hairs ; joints of antenna with a few minute hairs upon' each 

 segment. The Cauda is small, broad and ui)turned, and quite incon- 

 spicuous. These females have fully-developed ova at this time, and are 

 present in considerable numbers on the under side of the leaves of box- 

 elder trees upon the college campus. I find them most common upon 

 small twigs near the trunk and upon small shoots thrown out about the 

 trunks. 



Winged Male (Plite 11, fig. 8). 



Specimens taken along with above described females. 



General colour very light green or greenish-yellow, with or without a 

 tinge of brown on head and thorax, and a deeper brown on more or less 

 of cornicles. Upon the dorsum of the abdomen are two to four black 



