PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 751 



The statement is sufficiently self-explanatory. 



In No. 18, i.e., the strsiw pura (Plate 114, fig. 3), the places where 

 the grain was affected are the two ends indicated by dots in Plate 118,, 

 fig. 1. The ends of the longitudinally arranged straw making up the 

 lining inside converge at the ends but leave enough openings for the 

 insects to creep in. Out of 468 lb. 2 oz. left in January 1918 about 117 

 lb. was fairly damaged (1 grain in about 8 bored) and the rest was good. 



In No. 19, i.e., in the straw momi (Plate 116), the places where the 

 grain was affected in the column of the wheat (the column was about 

 5 feet high, 5 feet in diameter at the top and 41 feet in diameter at the 

 base) are indicated by dots in Plate 118, fig. 1. At the top the infection 

 spread up to a layer of about one inch all round and at the bottom to 

 a depth of about two inches. Of the total weight obtained in January 

 1918, about 320 lb. was slightly damaged (about 1 grain bored in every 8) 

 and in about 100 lb. one grain in every 4 was bored. The rest was good. 

 It should be mentioned here that in September 1917 about 320 lb. of 

 affected wheat was cleaned in the Insectary compound at a distance 

 of about 50 yards from the mwai. Millions of weevils spread all round 

 and many reached the morai too over ploughed-up fields. 



As noted above, the agents of the damage were Calandra oryzce^ 

 There were, however, some Tenebroides mauritanicus, Triholium 

 castaneum and Lcemo'phlceus pusillus grubs and adults in almost all 

 samples kept inside the godown. 



It will be observed that free air, light and sun had no effect on the 

 rice weevil. The sand, of course, gave the best result. 



Experiment XVI. 



Fumigation with Nitro-benzol. 



13th January 1918 ; 10-30 a.m. . In a wooden fumigating-box measuring 2' 6" 



on all sides a quantity of the affected wheat 

 from the previous experiment was placed to 

 a depth of about 2 feet. On the top of the 

 wheat was kept a flat porcelain dish with 

 45 cc. of Nitro-benzol and the cover of the 

 box put on and made air-tight by means of 

 water in the water- channel. 



14:th January 1918 ; 10-30 a.m. . The box was opened. A strong smell of Nitro- 

 benzol was perceptible. Only about 4 cc. 

 of Nitro-benzol had evaporated. Within 

 about one inch of the surface of the wheat 

 Calandra oryzce and Tribolium castaneum 

 adults and Tenebroides mauritanicus grubs 

 were quite active. 



At 3 p.m. . . . . There was vet sufficient smell of Nitro-benzol 



present in the wheat, although it was left 

 quite exposed 



VOL. 11 Y 



