1912 ENTOMOLOGICAL SOCIETY. 33 



Cabbage Maggot we tested several different substances, such as Cliffs Manurial 

 Insecticide, Apterite, Soft Coal Soot, and also the tarred-felt-paper discs. The 

 latter alone gave satisfactory results, scarcely any plants being killed where the 

 discs were used. We tind that most of those who use the discs make one of several 

 mistakes which interfere with good results. First, many use tar-paper instead of 

 thin tarred felt-paper. Second, the discs are not put on soon enough after setting 

 out the plants. They should be put on at once; the delay of a single day may 

 allow the flies to lay their eggs before the discs are in position. Third, the cultivator 

 is often used soon after the discs are put on and earth is thrown over them and 

 against the plant. When this is the case the discs will in many cases not prevent 

 injury. The earth should either be removed with a small! whisk or the ground 

 left uncultivated for about two weeks or more after setting out the plants. Fourth, 

 the discs are not fitted neatly and closely around the stem. 



Squash Bug (Anasa tristis). This insect seems to have done very little 

 damage this year. Two years ago it threatened to become very abundant, but 

 climatic conditions seem to have been unfavourable. 



Perillus hioculatus, var. claudns, has been found in many counties this year. 

 Evidently it ranged almost all over the southern and western part of the province, 

 and, at lieast, as far ea^t as Toronto. In some potato fields it was present in large 



Fig. 22. 

 Perillus cireumcinctus. 



This insect closely resembles P. biooulatus, var. claudus. 



numbers and destroyed many of the adult Colorado beetles and also the larvae. 

 Apparently it attacked the eggs also, but ISIr. Baker and I were not quite sure on 

 this latter point. Some farmers wrote saying that they did not have to spray their 

 potatoes this year to destroy the Colorado beetles, and attributed their decreased 

 numbers to this insect. P. claudus, both in the adult and nymph stages, feeds on 

 the potato beetles. We found the insects in all stages : eggs, nymphs and adults. 

 The eggs are black and quite conspicuous and laid in clusters on the leaves. The 

 female adult dift'ers from the male in having white or cream markings instead of 

 red. 



At Fonthill I found another Pentatomid feeding in the same way on the 

 beetles and larvas. 



Grain Chops, etc. 



Hessian Fly (Mayetiola destructor). In Peel county many fields of wheat 

 were severely attacked by Hessian Fly. I gathered a considerable number of the 

 puparia hut only parasites emerged. 



Chinch Bug (BUssus levcopterus) . It was a surprise to us to find that the 

 Chinch Bug was right in our midst last summer. In June the nymphs were 

 "found destroying the grass in a lawn in Guelph. Later on we obtained as many 

 adults as we needed for class purposes from this same lawn. This is the first time 



3 E.S. 



