THE CANADIAN ENTOMOLOGIST. 143 



method of control, I have never met an orchid grower who practised 

 it. Most of them prefer to cut off and destroy the infested buds. 

 If this operation is kept up persistently by an experienced man, 

 it is only a question of time until the insect is eradicated. The 

 man, however, must be experienced in detecting the infestations, 

 otherwise many healthy buds will be destroyed. Many growers 

 become quite eiKpert in this, and can distinguish at a glance be- 

 tween a healthy and infested bud, both of which will seem perfectly 

 normal to the ordinary observer. This insect also is undoubtedly 

 being continually introduced in orchids imported from South 

 American countries. 



Aphrophora parallela Say. (Homop.). During June, 1915, 

 many pine trees in a nursery at Elizabeth were observed to be 

 rather plentifully infested by the above spittle insect, the white 

 frothy masses giving the trees the appearance of having been 

 decorated for Christmas. No injury to the trees could be detected, 

 but it was somewhat unusual to find them occurring in such com- 

 paratively large numbers. It was noticed after collecting the 

 nymphs that their bodies shrunk in five or six hours to one-third 

 of their normal size. 



Cecidomyia resinicola O. S. (Dip) During June, 1915, many 

 characteristic whitish masses of pitch inhabitated by numerous 

 orange-coloured larvae of the fly were observed on the undersides of 

 pitch-pine branches in nurseries at Springfield and Elizabeth. 

 They attracted considerable attention from the nurserymen on 

 account of their noticeable numbers, but no apparent damage was 

 being done. 



Corythuca arcuata Say. (Hemip.). Every summer this lace 

 bug and its curious groups of eggs, which resemble certain forms of 

 fungi, may be found on the leaves of oaks and other trees in various 

 parts of the state. As a rule, it receives very little attention, 

 although some seasons it is abundant enough to cause a whitening 

 and withering of the foliage. Some day when it transfers its 

 affection from forest to lawn trees, it may rank as more of a pest. 



Harry B. Weiss, New Brunswick, N. J. 



AspiDioTus uLMi Johns. 

 I have taken this insect on the following host plants in Missouri: 

 Catalpa catalpa; Ulmus sp.; Ptelea trifoliata and Juglans nigra. 



