177 



Veitch (R.) & Greenwood (W.). The Food Plants or Hosts of some 

 Fijian Insects. — Proc. Linn. Soc. A'.5.IF., Sydney, xlvi, pt. 4, 

 no. 184, 23rd December 1921, pp. 505-517. 



In the course of investigations of sugar-cane pests of the Fiji Islands, 

 a considerable number of food-plants and host records were obtained ; 

 a list of these is given, arranged under the orders of the insects by 

 which they are attacked. 



Fenton (F. a.) & Ressler (I. L.). Artificial Production of Tipburn, 



— Science, Garrison-on- Hudson, N. Y., Iv, no. 1411, 13th January 

 1922, p. 54. 



By the injection, into leaves of potato plants, of small amounts of 

 emulsion made by crushing the adults of both sexes of Empoasca mali 

 in water, an injury was produced similar to, if not identical with, 

 tipburn. The injection of an emulsion made from crushed nymphs 

 only produced slight injury in a few cases. From further experiments 

 it is evident that the insects contain some toxic substance that causes 

 the injury. Bordeaux mixture does not apparently prevent tipburn 

 by its action on the leaf, but rather by its action on the insect. It 

 acts so slowly on the nymphs that tipburn was produced on sprayed 

 leaves colonised with nymphs. 



E^■ANS (W.). Cryptohypnus riparius, a Click-beetle as a possible 

 Agricultural Pest. — Scottish Naturalist, Edinburgh, no. 119-120, 

 November-December 1921, pp. 181-182. 



Cryptohypnus riparius, F., is the commonest click-beetle occurring 

 in Scotland, and may be responsible for a great deal of the damage 

 caused annually by wireworms. It is found almost anywhere in open 

 country, both in cultivated and uncultivated areas. The adults 

 occur from February to October, though most abundant in the spring. 



Jackson (D. J.). Notes on the Distribution of Weevils of the Genus 

 Sitona in the North of Scotland. — Scottish Naturalist, Edinburgh, 

 no. 119-120, November-December 1921, p. 178. 



The species recorded are : Sitona lineata, L., on peas, beans, tares, 

 wild vetches, and occasionally on clover ; 5. hispidula, F., common on 

 clover, but rare in fields near the sea ; S. fiavescens. Marsh., common 

 on clover ; S. punciicollis, Steph., on clover, especially on low ground 

 or near the sea; S. sulcifrons, Thunb., abundant amongst clover; 

 5. crinita, Hbst., rare on clover ; S. regensteinensis, Hbst.,- fairly 

 common on lupins and amongst low growing herbage; S. tibialis, 

 Hbst., common on tares, wild vetches and meadow vetchling {Lathyrus 

 pratensis) ; and S. suturalis, Steph., rare, only taken by sweeping 

 clover. 



Da\'idson (J.). Biological Studies of Aphis rumicis, L. A. — Appear- 

 ance of Winged Forms. B. — Appearance of Sexual Forms. — 



Sci. Proc. R. Dublin Soc, xvi, no. 25, 29th August 1921, pp. 304- 

 322, 3 figs. [Received 1st February 1922.] 



From a long series of breeding experiments and cytological inves- 

 tigations on Aphis rumicis, the author is led to the conclusion that 

 the sequence of winged and apterous forms is largely due to some 

 internal inherent tendency, and not to food and temperature conditions, 



