262 



thought might be Ela]:>s corallinus. Mr. Maingot placed on the 

 table two stone axes from Venezuela, which he said were remark- 

 able on account of their size the quality of the stone and the 

 marked contrast they exhibited in the graining. Sir John Gold- 

 ney made some remarks about these flint implements and the 

 manner they were split in some parts of England, and the 

 similarity of ther shape to the iron ones used by the nativ^es of 

 the remote districts of Singapore. After a vote of thanks to the 

 President the meeting adjourned at 10 p.m. 



COCCID^, OR SCALE INSECTS. 



By T. D a. Cockerell, F.Z.S., F.E.S., Curator of Museum 

 Institute of Jamaica. 



(Fromthe Jamaica Botanical Department Bulletin.) 



(Concluded.) 

 Very full accounts of the gas treatment, with figures of the 

 apparatus, will be found in the Reports of the U.S. Department 

 of Agriculture and other works, which may be consulted in the 

 library of the Institute of Jamaica. If any one resident in the 

 country is desirous of using these remedies, and wishes for more 

 complete details, I shall be happy to give any information in my 

 power ; but the essential features of the remedies are given above, 

 and doubtless the exact method of working and kind of apparatus 

 used would have to depend in each case on the available facilities, 

 the kind of plant attacked, and so forth. 



I shall be greatly obliged to all those who try these remedies, 

 if they will communicate the result to me, so that it may be pub- 

 lished for the benefit of the community. The kerosine emulsion 

 has proved very successful on Orange trees near Kingston, but 

 there has been very little ex2Derimenting with these remedies in 

 Jamaica. 



Natural Enemies. 

 Nature has methods for destroying scale-insects which are 

 more efl'ectual than anything which can be accomplished by human 

 means. These consist in other insects preying upon them, either 

 predaceous in the ordinary v.'ay, or infesting them as parasites. 

 They may be grouped as follows : — ■ 



Hymenoptera. 

 (1.) Family Chalcididce. — Minute four-winged insects, the 

 larvae or grubs of which are mostly parasitic within the bodies of 

 insects. They can be at once distinguished from the larger 



