24 



Traps or artificial breeding-places for Oryctes monoceros, 01. (coconut 

 beetle), have been kept working regularly since 1913, and details are 

 given of the results in various localities. Up to 31st March 1918, 

 with a total of 350 traps, 5,259 dead palms have been destroyed, and 

 eggs or individuals of 0. monoceros in varying stages to a total of 

 209,345 have been captured. The cost is estimated at about 5s. 

 per trap per annum. 



An account is given of the cultivation of silk, an industry which it 

 is hoped may be much improved, and the report of the Imperial 

 Institute on eri silk from British East Africa is appended. 



DopwELL (H.). Annual Report of the Foreman Plant Instructor 

 on Coconut Beetle Trap Work and Native Coconut Cultivation 

 for the Year ending 31st March 1918. — Brit. E. Africa Dept. 

 Agric. Ann. Kept. 1917-1918, Nairobi, 1921, pp. 99-104. 

 [Received 10th November 1921.] 



A detailed account is given of the working of traps for the coconut 

 beetle [Oryctes monoceros] and of coconut cultivation by the natives 

 [see preceding paper]. 



Hopkins (A. D.). U.S. Bur. Ent. Bioclimatic Zones determined 

 by Meteorological Data. — Mthlv. Weather Rev., Washington, D.C., 

 xlix, no. 5, May 1921, pp. 299-300. [Received 11th November 

 1921.] 



In the present paper the determination and characterisation of 

 the bioclimatic zones is discussed [cf. R.A.E., A, ix, 506]. Tempera- 

 ture is the most reliable guide to the preliminary interpretation of 

 the distribution and range of the zones. The application of the 

 thermal mean principle of identifying bioclimatic zones must be 

 based on a table of sea-level constants for the sea-level isophanes of 

 the continents of the northern and southern hemispheres, computed 

 from the records at an intercontinental base. By means of this 

 table, a preliminary preparation of which has been made with 

 Parkersburg in West Virginia as the intercontinental base station, 

 the zone represented by the geographical position of any meteorological 

 station in the world may be indicated by comparing its recorded 

 means with the corresponding thermal constants of the table. This is, 

 however, only one of many methods of identifying the zone represented 

 by a geographical position and is only intended to supplement the 

 others. Its great value in making preliminary predictions, when no 

 other method is available, is shown by the fact that the predictions 

 based upon it for over a thousand stations in many cases agree as 

 closely with the facts as those determined by any method short of a 

 detailed survey 



Allen (R. H.). Report of the Division of Plant Pest Control. — 



Massachusetts Ann. Rept. Dept. Agric, Year ending 30th 

 November 1920, Boston, Publ. Doc. no. 123 [1921], pp. 71-79. 

 [Received 8th November 1921.] 



During the year the department has been chiefly concerned with 

 the inspection of nurseries and nursery stock, and with the European 

 corn-borer [Pyrausta nubilalis. Wo.]. As this moth was found to 

 be present in a large number of new food-plants, the quarantine of 

 the previous year, which prohibited the movement of maize, has been 



