96 SCIENTIFIC REPORTS OF THE AGRICULTURAL RESEARCH 



A. hierocosma has been reared at Pusa in September and 

 October from larvae mining leaves of N. litchi. Only one 

 moth could be reared from the larva? in the fruits and this 

 is slightly different from the leaf -mining form, although 

 it is probably the same species. This fruit-infesting larva 

 is referred to in Indian Museum Notes, Vol. V, pp. 121-122, 

 t. 15, if. 4, 4«, where it is unnamed. 



Life-histories of Insects. Besides the various insects 

 mentioned above, a large number of insects has been reared 

 during the year and observations made on life-histories and' 

 habits. In a Report of this nature it is only possible to 

 mention a few of these even by name. 



(1) Monohammus versteegi. Eggs of this longicorn 

 beetle borer in orange stems were collected in June 1918 at 

 Haflong in North Cachar. The adult has been reared out 

 and found to have one generation annually. 



(2) Grubs of a longicorn beetle borer in jak stems 

 (Plate IX, fig. 1.) were collected in Sylhet in June 1918. 

 These are still (July 1919) feeding and will probably live 

 another year, so that the larval stage extends over a period 

 of two or three years in this case. 



(3) C ryptorrhynchus gravis. This serious pest of 

 mango fruits in Eastern Bengal and Assam was formerly 

 supposed to lay its eggs in the flowers. This year it was 

 definitely ascertained that the eggs are laid, not in the 

 flowers, but in the fiuits, even well-grown ripening fruits 

 not being immune. The period of oviposition is an extend- 

 ed one. The shortest period for completion of the life-cycle 

 is about three weeks or even less. Local observations and 

 experiments extending over a whole year are necessary 

 for the suggestion of preventive or remedial measures. 



(4) Balaninus c-album. Short details of the life-his- 

 tory of this weevil infesting Eugenia jambolana fruits 

 were given in last year's Report. A quantity of infested 

 seed was kept buried at a depth of about two feet; no weevil 

 succeeded in emerging from these seeds. Collection and 

 adequate burial of the seeds should therefore keep this 

 weevil in check. 



