1913 



ENTOMOLOGICAL SOCIETY. 



105 



five per cent., and not every apple that had been punctured was sufficiently 

 deformed to consider it a cull though very few could be classed as No. 1. 



I regret that descriptions of nymphs were not made with sufficient care to 

 be reliable, and that we have not yet had a chance to make a study of the life 

 history of each species. So far as I can see, however, from the fact that the 

 attacking nymphs are very small when the apples are just forming and that both 

 nubilus and colon seem to keep pace with mendax in development, the life history 

 of the former two will probably closely correspond to that of Lygidea mendax and 

 Heterocordylus malinus as given by Crosby. 



It may perhaps be of interest to note that Mr. Van Duzee states that he 

 usually finds Neurocolpus nubilus on Sumach and Paracalacoris colon on Bladder- 



Fig. 41. — Tips of tender shoots killed by young plant bugs. 



Nut. I examined carefully sumachs about half a mile from the orchard, but could 

 find no Capsids on any part of them. There were no Bladder-Nut bushes near. 



I have taken specimens of Heterocordylus malinus on a couple of occasions 

 in the vicinity of Guelph, but have not yet been able to prove that they cause 

 any damage to apples in Ontario. Professor Parrot has found that another 

 Capsid, Lygus invitus, does considerable damage to pears. I have not yet hap- 

 pened to observe any injury from it in this Province, though probably it is 

 doing some. 



Almost every place I go, and especially at Institute meetings deformed apples 

 and pears are brought in by farmers who are anxious to know the cause. From 

 the nature of these deformities I feel that a large field for investigation is etill 

 open to entomologists, though of course a good many deformities come under 

 the province of the plant pathologist equally as much as under that of the ento- 

 mologist. 



