126 



THE EEPORT OF THE 



No. 36 



The newly emerged winged form has the antennae and legs very light yellow, 

 almost transparent; the eyes dark red and very conspicuous, the head, prothorax 

 and abdomen rufous red, the mesothorax yellowish, streaked with red. The wings 

 are crumpled up at first and dark green in colour, with the exception of the costal 

 nerve, which is yellow. The green colour remains for some time after the wings 

 are finally resting roofwise over the back of the insect. 



The waxy excretion does not make its appearance in any quantity until some 

 twenty-four hours after the winged form has emerged from its pupal covering. 



Migration. Experiments were carried out in Stanley Park two years ago 

 with the object of confirming the former observations on the secondary host tree. 

 Opening galls were placed in cages along with fresh branches of Sitka Spruce 



Stem mother on Sitka spruce. 



Experimental cage in Stanley Park. 



(P. sitchensis), Douglas Fir {Pseudotsuga mucronata) and Western Hemlock 

 {Tsuga heterophylla) , these three trees being the only conifers within the precincts 

 of the Park. The experiments showed beyond all doubt that the secondary host 

 tree was the Douglas Fir; only a few lice locating on the spruce and hemlock, on 

 which they apparently do not thrive ; whereas they were found settling freely on the 

 needles of the fir, as many as 7 being found on the same needle, 2 or 3 being a 

 common number. A few figures of the cage experiments are given beloAv: 



Nos. of Lice Settjling on Each Tree. 

 Cage. Spruce. Douglas Fir. Hemlock. 



1 



2 1 



3 15 



4 



