186 



parasitised by 0. limnilis or D. tryoni, the death of these usually results 

 from starvation or suffocation or possibly by the absorption of toxic 

 excretions of the Tetrastichus larvae. Since this parasite does not 

 exert any perceptible control of the fruit-fly, its introduction must be 

 regarded as detrimental owing to its interference with the work of 

 0. humilis. 



The superiority of 0. humilis over the other introduced fruit-fly 

 parasites in Hawaii is clearly proved, and the decided restraint placed 

 upon it by the unfailing cannibalistic activities of the larvae of 

 D. tryoni in particular, and of other parasites in part, show that 

 results detrimental to a certain extent have arisen from the liberation 

 of parasites other than 0. humilis, the value of which has been reduced 

 to that of a secondary parasite. 



McKay (J. W.). Annual Report of the Karimganj Agricultural Experi- 

 ment Station for the Year ending the 30th June 1917. — Ann. Rept. 

 Agric. Expts. & Demonstrations in Assam for the Year ending 

 30th June 1917, Shillong, 1917, pp. 68-82. [Eeceived 12th March 

 1918.] 



The control of hairy caterpillars infesting the jute crop has been 

 successfully effected by hand-picking the leaves on which the newly- 

 hatched larvae were clustered, and placing them in hot water 6r 

 kerosene. 



The rice bug {Leptocorisa varicornis) is the cause of immense annual 

 loss to the rice crop, but is effectively checked by the following method : 

 Two boys take a light cloth about 15 ft. long and 4 ft. wide, holding 

 the opposite ends with a corner in each hand. By approaching the 

 hands to a distance of 18 inches they form a long narrow bag with 

 which they sweep across the tops of the plants by running quickly up 

 and down the plot. The bag is then closed and twisted at each end to 

 destroy the many bugs that are captured in this manner. 



The adult moths of the stem-borer are easily destroyed by means of a 

 lamp suspended over a barrel of water covered with a light film of 

 kerosene. 



Insect Pests of Tea in North-East India during the Season 1916. — 



Qtrly. Jl. Scient. Dept. Indian Tea Assoc, Calcutta, Pt. 3, 1917, 

 pp. 75-79. [Received 12th March 1918.] 



The insects attacking tea in North-East India in 1916 were : 

 Helopeltis theivora, Waterh. (tea mosquito) which, though it did no 

 damage of exceptional severity, occurred in districts usually considered 

 free from attack ; Empoasca flavescens, F., of which imusually severe 

 attacks were experienced in some districts, generally following severe 

 hail ; Tetranychus bioculatus, W.-M. (red spider), which was less 

 serious than usual ; Heterusia magnifica, Butl. (red slug), the damage 

 done by which was negligible ; Biston suppressarius, Guen. (looper), 

 which occurred in much smaller numbers than in 1915 ; Clania spp. 

 (faggot and bag worms) and Thosea spp. (nettle-grubs), little damage 

 from which was reported ; Physothrips setiventris, Bagn., and an 

 undescribed species of thrips, the attacks of which were of normal 

 intensity ; Brachytrypes achatinus, StoU (cricket), reported as causing 

 damage in nurseries ; and Termes {Odontotermes) sp. (termites), which 



