225 



G. B. Doses d'ars6niate de soude et d'ac6tate de plomb pour obtenir 

 rars§niate de plomb. [Quantities of sodium arsenate and lead 

 acetate required, for obtaining lead arsenate.] — Rev. Vitic., Paris, 

 xliv, no. 1132, 9th March 1916, pp. 194-195. 



Lead arsenate, for use against Clysia ambiguella and Polychrosis 

 holrana, may be obtained commercially or may be prepared from 

 sodium arsenate and lead acetate. The quantities required for 62| gals. 

 are 30 oz. sodium arsenate and QQ oz. lead acetate, the latter salt being 

 gradually added to the former. Lead arsenate is in a better physical 

 state when it is mixed with acetate of copper (verdigris) than when 

 incorporated into a copper sulphate spray. 



Fletcher (T. B.). Agricultural Entomology. — Reprint from Ann. 

 Rept. Bd. Scientific Advice for India, 1914-1915; Calcutta, [1916] 

 Economic Zoology, pp. 1-15. [Received 1st April 1916.] 



The first part of this paper deals with work done at Pusa. Experi- 

 ments are still in progress to test the relative immunity of different 

 varieties of cotton to attacks of bollworm {Earias). The bollworms 

 found were also examined for the presence of parasites, which w^ere 

 bred out, recorded and liberated in the experimental area. So far as 

 noted hitherto the infestation of Earias [insulana] by Rhogas [lefroyi] 

 is less than 5 per cent., even under the most favourable conditions. 

 The life-history of the Cercopid, Machaerota plamtiae, was studied. This 

 insect lives in a calcareous tube on cotton stems and frequently stunts 

 the growth of the young shoots. With a view to sending parasites 

 of Chrysomjphalus (Aspidiotus) anrantii to Italy, a study was begun of 

 the parasites of this scale, which occurs commonly at Pusa on Citriis sp., 

 but very few parasites could be obtained. A large amount of material 

 was collected with a view to finding parasites of Coccus {Lecanium) 

 viridis in the coffee districts of South India, but most of the local 

 Lecaniinae were free from Chalcid parasites ; only those scales found 

 on Ficus religiosa and Ricinus communis were parasitised to any extent. 

 Life-histories of Aleurodes citri, A. bergi and A. ricini were studied 

 and attempts made to procure parasites. The complete life-history 

 of the Fulgorid, Pyrilla aberrans, was worked out during the year. 

 Chalcid, Dryinid and Stylopid parasites were also reared, some of these 

 being new. It is stated that three species of Pyrilla (P. aberrans, 

 P. perpusilla and P. piisana) are found on sugar-cane at Pusa, all of 

 which were formerly confused under the first name. Much time was 

 given to the outbreak of Nephotettix bipirnctatns (rice leaf-hopper) in 

 the Central Provinces. Of six control measures tried, it was found 

 that putting up lantern traps in the fields was the most efficacious 

 and the most readily adopted by the cultivators. 



In the insectary some two hundred insects were studied which had 

 not been previously reared. Among the beetles were many predaceous 

 species, including an unidentified Carabid predaceous on a Cydnid bug ; 

 a species of Chlaenius predaceous both in the larval and adult stage on 

 caterpillars of Utetheisa pulchella, and several Elaterid beetles. Of 

 these last a single grub of Agrypnus sp. destroyed more than 200 

 Scarabaeid grubs in the course of about three months, and another 

 Elaterid larva was found to exercise a considerable control on Tene- 

 brionid grubs feeding at the roots of gram and other crops. It was 



