127 



the other species referred 1o. While spreading over the fields in the 

 wingless stages, it returns to the stubble and grass-lands for the 

 breeding season. Species of minor importance accompanying C. 

 pellucida were M. minor, M. packardi, M. gladsloni, M. davi'soni, 

 M. bivittatus and M. femitr-nibruni. The campaign of 1919 demon- 

 strated the value of effective preparation and energetic action, and 

 organisation is complete to meet the expected invasion of 1920. The 

 location of the eggs is known, and the young hoppers can be attacked 

 immediately upon hatching. Deep ploughing has destroyed many 

 eggs, especially of Melanoplus. Exposure to the sun also kills them, 

 as they cannot survive a temperature of 90° F. for many hours. 



BucKELL (E. R.). Life-history Notes on some Species o£ Acrididae 

 (Orthoptera) found in British Columbia. — 50th Ann. Rcpt. Ent. 

 Soc. Ontario, 1919, Toronto, 1920, pp. 53-61. [Received 8th 

 January 1921.] 



A list is given of the grasshoppers occurring in British Columbia, 

 with some notes on their habitat, food-plants, etc., though it has 

 been impossible to complete the life-history of many of them. 



Brittaix (W. H.). One Year's Experiments in the Control of the 

 Cabbage Maggot.— 56'//? Ann. Rcpt. Ent. Sac. Ontario, 1919, 

 Toronto, 1920, pp. 61-68. [Received 8th January 1921.] 



Experiments in the control of Phorbia brassicae (cabbage maggot) 

 were continued on the lines of the previous year [R. A.E., A, viii, 4], 

 and the results are shown in tables. Materials that gave some measure 

 of success, but that do not seem worthy of further trial in view of the 

 better results obtained Math other substances, include nicotine sulphate 

 and clay, nicotine and sulphur, para-dichlorobenzene alone, and 

 salt solution. Other materials, which actually seemed to weaken the 

 plants, were dry lime-sulphur, white arsenic, sodium arsenate, and 

 combinations of these compounds. A mixture of 40 per cent, tobacco 

 dust, 1 per cent, corrosive sublimate and 59 per cent, clav produced 

 the largest number of uninfested plants ; but a mixture of 1 per cent, 

 creosote to 99 per cent, clay gave the largest tonnage per acre, with 

 lower cost of treatment. Anthracene oil in place of the creosote, and 

 a mixture of 10 per cent, para-dichlorobenzene and 90 percent. Scotch 

 soot, both gave somewhat less success. Plots treated with this last 

 mixture come second in tonnage per acre produced, though showing 

 fewer plants free froni injury. The plants in these plots were of a 

 deeper green and healthier colour generally than those in the others. 



Treherne (R. C.) & RuHMANN (M. H.). The Control of the Cabbage 

 Root Maggot in British Columbia.— 56*/ A Ann. Rept. Ent. Soc. 

 Ontario, 1919, Toronto, 1920, pp. 68-70. [Received 8th Tanuarv 

 1921.] 



Tests are recorded in which corrosive sublimate treatment was tried 

 in comparison with the tar-paper-disc method of controlling PJiorbia 

 brassicae (cabbage root maggot) [R.A.E., A, viii, 4]. The tests were 

 made with cauliflowers, and the results clearly showed that in low- 

 lying lands tar-paper discs are unsatisfactory, as heat acting on the 

 subsoil rnoisture produced condensation beneath the disc, causing 

 a condition known as wilt. Corrosive sublimate in three treatments 



