Sept., '02] ENTOMOLOGICAL NEWS. 227 



noted, however, that the lime, forming a granular coating on 

 the tree, has a tendency to prevent the proper attachment of 

 the waxy covering, thus causing a slight percentage of the 

 young scales to slough off. 



On the lime-sulphur-salt and the sheep dip trees the young 

 scales attempt to settle but die in situ, and thousands of them 

 can still be seen clinging to the bark, apparently held in place 

 by the mouthparts. 



Although the coating on the lime-sulphur-salt trees is much 

 finer than on the lime-salt and lime trees, that is not a satis- 

 factory explanation, because on the trees treated with sheep 

 dip there is no apparent coating and the young scales die in 

 the same way, showing that the soluble compounds form the 

 essential part of the mixture. This is an important practical 

 item here in the Colony,— good quicklime being both expensive 

 and hard to obtain, — for it greatly reduces the cost of the wash 

 as well as the difficulty in application. 



The meteorological record shows a total rainfall of 10.145 

 inches from August 13, 1901 to January 3, 1902, distributed in 

 45 rains, not counting 4 " trace" records, as follows : August 

 13th, 0.005; 2ist, 0.02; 22d, 0.04; 23d, 0.07; 24th, trace; 

 25th, 0.22; September ist, 0.04; 2d, 0.04; 3d, 0.12; 7th, 

 o. 1 1 ; 8th. 1.44; 9th, o.io; iith, 0.48; 12th, 0.37; 15th, 

 0.72; i6th, trace; i8th, 0.18; 28th, 0.04; 30th, 0.17; Oc- 

 tober ist, 0.35 ; 4th, 0.75 ; 5th, 0.02 ; 6th, 0.14 ; 20th, 0.07 ; 

 2ist, o.oi ; 24th, trace; 25th, 0.20; 28th, 0.03 ; 30th, 0.02 ; 

 31st, trace ; November 4th, 0.04 ; 5th, 0.13 ; 9th, 0.76 ; loth, 

 0.07; i8th, 0.57; 19th, 0.63; 20th, 0.29; 2ist, o.ii; 28th, 

 0.02; December 2d, 0.02; 8th, i.oo; 9th, 0.02; nth, 0.09; 

 2oth, 0.02 ; 26th, 0.05 ; 29th, 0.34 ; 30th, o.oi ; January 2, 

 1902, 4.05 ; 3d, 0.17. 



It will be noticed that the first heavy rain came September 

 8th, twenty-six days after tests i and 2, allowing ample time 

 for the destruction of the old scale, but as stated above, very 

 few seemed to succumb. Its effectiveness is limited to the 

 destruction of the young scales, thousands of which emerged 

 but, as far as can be determined, none of them have survived, 

 although on the control trees the .second generation is appear- 



