42 
Mr. Howard asked whether Prof. Forbes considered his experiments with the 
apple plant louse were satisfactory. 
Prof. Forbes thought not entirely but they were the best they could do under 
the circumstances. 
Mr. Fletcher asked whether the habits of different broods in species which 
migrated from one plant to another were not very different and therefore difficult 
to experiment with—as, for instance would the hop inhabiting form of Phorodon 
humuli live upon plum if placed there artificially and vice versa. 
Prof. Riley thought it would not. It is very difficult to do artificially what 
nature does in her own time and in her own way. Sometimes an insect will not 
colonize upon a plant at a certain season, to which at another time of the year it 
migrates naturally. He asked if the experiments made upon the root forms were 
done carefully as there are many species which resemble each other which have 
root forms. 
Prof. Forbes stated that great care had been taken in carrying out the 
experiments. 
Prof. Forbes read a paper “ On the life-history of White-grubs, with descrip- 
tions of new stages.” Current mistakes with regard to the life-histories of these 
injurious insects were pointed out. Several species of Lachnosterna were observed 
to reach the imago state in the autumn instead of in spring as usua lly stated and 
the differences between groups of larvee were pointed out. 
The paper was discussed by Messrs. Smith, Howard, Forbes and Riley, who 
confirmed many of the points made in the paper. 
Myr. C. A. Hart read a carefully prepared paper on “ The ee -history of Wire- 
worms,” in which he drew particular attention to distinguishing characters by 
which these larvze might be divided into groups. 
The paper was discussed by Messrs. Cook, Gillette and Bruner. 
Prof. Cook had found that one crop of buckwheat will not prevent injury the 
next year. 
Mr. Fletcher gave some “Notes upon Injurious Insects of the year in 
Canada.” Cut-worms of various kinds had been locally abundant. <Agrotis turris 
had been destructive in gardens to Howers and vegetables. Hadena arctica and 
H. devastatriz had injured fall wheat and grasses in the spring. He was more 
than ever in favour of the poisoned trap remedy for cut-worms. <Agrotis fennica 
had injured clover. The caterpillar of Pieris rape had been very troublesome, 
but was easily destroyed with pyrethrum powder diluted with four times its 
quantity of common flour or slaked lime. 
Plutella cruciferarum had also done much harm to cabbages in the 
North-west Territories and British Columbia. This is much more difficult 
to destroy with pyrethrum than the last named. The Cabbage Root-maggot 
had attacked cabbages severely, but had been successfully destroyed by 
syringing about half a cupful of hellebore tea round each root and then 
hoeing the soil well up round the stem. He had made some interesting studies 
of the Hessian fly which agreed in the main with those published by Prof. 
Forbes in a late bulletin. Spring wheat sown in the end of April had been 
attacked at the root in the same way as wheat is injured by the autumn brood. 
From the same wheat plants he had bred the Hessian fly, the Wheat Bulb-worm 
and Oscinis variabilis. Insects injurious to fruit trees had been represented by 
the Plum Curculio, the Codling Moth, the leaf roller of the apple and the Canker 
worm. All of these had been successfully treated with Paris green. Observa- 
