102 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Fahr. 



Lower zone of fatal temperature 5 to 22 



Zone of hibernation 22 to 56 



Zone of activity . 56 to 91 



Zone of aestivation . 91 to 122 



Upper zone of fatal temperature 122 to 140 



-Mr. McAtee, commenting on the hibernating insects on 

 Plummers Island, Maryland, stated that numerous specimens 

 of Bembidium and Corythuca, taken under bark, were brought 

 into the laboratory, but that none had shown signs of life. 

 The following captures were recorded : 60 Milyas cinctus 

 were found together under bark of tulip tree and 19 Pyrellia 

 cyanicolor, including both sexes, were taken from an ant gallery 

 in an old fallen log. The close packing of the flies and the fact 

 that some had crowded into small parts of the gallery were of 

 interest, as the behavior is in such marked contrast to their 

 love of freedom during summer months. 



-Mr. Quaintance commented on the economic importance 

 of a knowledge of temperatures fatal to insects. Important 

 use is being made at the present time in the control of insects 

 in mills by heating the same to a temperature destructive 

 to the common mill species. A most excellent piece of work 

 on this subject is now under way by the Kansas Agricultural 

 Experiment Station, under the immediate direction of Mr. 

 Dean. Sufficient information is at hand to indicate clearly 

 that insects infesting plants may often be destroyed by the 

 use of water heated to a temperature fatal to the insects and 

 not injurious to the plants. For instance, the employment of 

 hot water in dipping nursery stock, grafts, and scions to de- 

 stroy the common woolly apple-aphis, Schizoneiini /au/^eni. 

 The use of hot water in this way dates back many years as 

 well as against the common peach borer, Sanninoidea cxitiosa. 

 There is need of an extended investigation of the subject, as 

 it appears to offer important possibilities in insect control. 



-Mr. A. B. Gahan gave an account of a chironornid fly 

 breeding in well water. He said : 



Last fall the writer was requested to investigate a com- 

 plaint by a resident of College Park, Maryland, that his well 

 water was being rendered unfit for use by the presence in it 

 of numerous small red "worms." Accordingly, an investi- 



