126 



mechanical damage. Since it has been calculated that it takes 1,000 

 of these insects to weigh an ounce, the number present must have been 

 enormous. 



South (F. W.). Summary of Locust Work for the 4th Quarter, 1916. 



— Agric. Bull. Fed. Malay States, Kuahi Lumpur, vi, no. 1, 

 October 1917, pp. 21-37. [Received 12th January 1918.] 



Measures against locusts for the third quarter were not concluded 

 in the Negri Sembilan, Pahang, Malacca and Johore districts till the 

 end of October, and the reappearance of hoppers early in November 

 necessitated a resumption of the work, which was not entirely finished 

 by the end of the year, though a successful result was anticipated. 



The year's locust work in the Peninsula may be regarded as quite 

 satisfactory, though there were unexpectedly large generations of 

 hoppers from March to May, probably the offspring of unknown swarms 

 from remote places. An even larger generation or succession of 

 generations followed from July to the end of October, but as only a 

 few of these swarms escaped there was a considerably smaller genera- 

 tion at the end of the year, the destruction of all the known swarms in 

 the Negri Sembilan and Malacca being probable by the end of January. 

 In all 2,911 swarms were destroyed in the Negri Sembilan, 158 in 

 Pahang, 4,952 in Malacca, and 1,877 in Johore during the year, the 

 position for 1917 appearing to be favourable, as most of the remote 

 possible breeding grounds are now known. 



Henry (G. M.). Insect Pests of Food Crops. — Trop. AgricuUuristy 

 Peradeniya, xlix, no. 5, November 1917, pp. 252-255. 



This paper contains a hst of the common pests of vegetables in 

 Ceylon and gives general recommendations for the control of each 

 class of insects dealt with. 



HuTSON (J. C). The Pink Boll WoTm.— Agric. News, Barbados, xvi, 

 no. 407, 1st December 1917, p. 378. 



In this article the great danger threatening the West Indian cotton 

 industry should Pectinophora gossypiella (pink bollworm) ever be 

 introduced into the islands is emphasised. Realising this, the 

 authorities of the Leeward and Windward Is. and those of Tobago and 

 Trinidad have framed stringent quarantine regulations ; these have 

 not yet been adopted by Barbados, though it is hoped that in the 

 near future similar action will be taken there. 



MuMFORD (F. B.). How the Station Works. — Missouri Agric. Expt. 

 Sta., Columbia, Bull. no. 151, September 1917, 68 pp. [Received 

 14th January 1918.] 



In the entomological section investigations were carried out on the 

 Ufe-history, distribution, injury, and methods of control of insects 

 injurious to nursery stock, especially the apple-leaf skeletoniser 

 [Canarsia hammondi]. Experiments showed that hydrocyanic acid gas 

 destroyed 97-98 per cent, of living scale-insects on nursery stock, while 

 miscible oil destroyed 99-100 per cent. 



