260 the canadian entomologist 



Proceedings of the Entomological Society of Nova Scotia for 1918. — 



No. 4. February, 1919. 89 pp., 7 plates. 



In this volume we again have proof of the vigorous condition of our Mari- 

 time Branch. It contains 13 papers, many of which are important contributions 

 to Canadian Entomology. Six of these papers deal mainly with the life- histories 

 of particular insects, four with general questions of natural and artificial control, 

 while only one is strictly taxonomic. 



The following is a list of these papers: — 



A few notes on ant history and habits. By Rev. H. J. Eraser. Pp. 6-9. 



The meaning of Natural Control. By John D. Tothill. Pp. 10-14. An 

 analysis of the factors operating in the natural control of Lepidoptera, 

 with special reference to the Forest Tent Caterpillar and the Fall Webworm 

 in New Brunswick. Tables are given, showing the average history of an egg- 

 raass of each of these species during certain years. 



Further notes on the Apple Maggot (19l'8). By W. H. Brittain. Pp. 15-23. 

 In this paper tables are given to show the dates of emergence of 640 adults 

 during the season of 1918, with maximum and minimum temperatures and 

 associated climatic conditions. The time of emergence in early spring is prac- 

 tically the same, whether the season is early or late. Two other tables give 

 dates of emergence according to the variety of apples infested. Experiments 

 were also made to determine the length of the pre-oviposition period, under 

 conditions of control in cages and in the open. It is shown that in certain 

 orchards formerly infested by the apple maggot, but which were rid of the pest 

 by spraying, these insects are now increasing, owing to the orchards having 

 been untreated for two years. 



The Salt Marsh Caterpillar (Estigmene acraea Drury). By H. G. Payne. 

 Pp. 24-31. A detailed account of the life-history of this "woolly-bear," with 

 descriptions of all the stages and a table giving dates of hatching, lengths of 

 instars and other data on the seasonal history. The paper is illustrated by an 

 excellent half-TOne from a photograph. 



A Copper Dust. By G. E. Sanders and A. Kelsall. Pp. 32-37. Gives the 

 results of experiments with a mixture of powdered dehydrated copper sulphate, 

 arsenate of lime and hydrated lime, containing 5 per cent, of metallic copper 

 and 2 per cent, of metallic arsenic. Methods of preparation, storage and cost 

 are also discussed. According to laboratory tests this mixture does not decrease 

 the killing value of arsenicals to the same extent as liquid Bordeaux. Late 

 potato blight was effectively controlled by it. 



Notes on the life-history and immature stages of three common Chrysomelids. 

 By W. E. Whitehead. Pp. 38-50. The species discussed are Disonycha 5- 

 vittata, Chrysomela scalaris and Gastroidea polygoni, all of which are illustrated 

 on plates 2 and 3. Full data on the seasonal history of each is given in tabu- 

 lated form. 



A modified Bordeaux mixture for use in apple spraying. By G. E. Sanders, 

 and W. H. Brittain. Pp. 51-61. An extended discussion of the properties 

 and actions of the various formulae used in the preparation of Bordeaux mixture, 

 particularly with reference to the proportion of lime in its effect on the mixture 

 as a fungicide. Conclusions believed to be correct for Nova Scotian conditions 

 are given on pp. 59-60. 



