1915 



ENTOMOLOGICAL SOCIETY. 



107 



the growth of the tree and forms a brown inerusted area the under surface of which 

 is then invaded by the Pliytoptid mites, and these eat away the tissues underneath 

 the bark and in that way separate the bark and cause the spreading of these brown 

 incrustations which are not therefore really produced by the Empoasca. In that 

 way the whole story was brought together. 



It is most interesting to find that Prof. Brittain has discovered it in Nova Scotia. 

 There is a very great deal to be learnt regarding these various forms of mites. 



Prof. Brittain : The mark caused by the mites has a very much more metallic 

 appearance. The lustre is more metallic, while the other has a softer gloss. 



The President : They hibernate under that incrustation in finormous numbers. 



CHERRY FRUIT FLIES. 



L. Caesar, 0. A. C, Guelph. 



In 1910 "as the result of a complaint about insects attacking a cherry orchard 

 at St. Catharines, I found that the pest was Rhagoletis cingulata. In 1912, when 

 examining another orchard near by R. fausla was discovered. 



1. R. fausta has a black abdomen. R. cingulaia has white cross bars on the 

 abdomen. 



2. The markings on the wings are quite different. 



/ ice /^frcfs/'er.s Aid ) 



Fig. 22. — A female Black-bodied 

 Cherry Fruit-fly {Rhagoletis 

 fausta.) Note the arrangement 

 of the dark markings on the 

 wings, and also the black abdo- 

 men without white crossbands. 



Fig. 23.— A female White-banded 

 Cherry Fruit-fly {Rhagoletis cin- 

 gulata.) Note the arrangement 

 of the dark markings on the 

 wings, and the presence of white 

 crossbands on the abdomen. 



Distribution of the Flies. 



R. cingulata in Canada has apparently been reported only from Ontario. In 

 Ontario it is found in a number of orchards and gardens from Oakville to Niagara 

 Falls, a distance of about 75 miles. Either it or fausta occurs at Cobourg and pro- 

 bably at Berlin. R. fausta has practically the same range in Ontario fruit districts, 

 but has also been found in British Columbia and on one occason in North Ontario 

 at Kearney. It has not been reported from any other part of Canada and is very 

 scarce in British Columbia. 



R. cingulata is on the whole the more aboindant, but there are many exceptions. 

 Some badly infested orchards will have 99 per cent, cingulata, others within two 

 miles 99 per cent, fausta. 



