130 NOTES ON A BRUSH-TONGUED MOSQUITO 



are unmitigated cannibals. One of these is Culex Tigripes 

 a number of these bred in a tub in the yard attached to 

 my place of business last year. I have a slide here of one 

 which has killed one of the yellow fever mosquitoes larva. 

 The Scotch Grey larva also kill all those within reach. 

 But both of these are also blood suckers, so that they only 

 kill to leave the ground clearer for their own depredations. 

 But in the Toxorychites we believe we have a vegetarian, 

 which does no harm to any human being, and is at the 

 same time a deadly foe to the young of other kinds of the 

 genus. It can be hired on very reasonable terms. Its 

 working hours are not limited, and it is very unlikely ever 

 to go on strike. It works in the very places where it is 

 needed. All the specimens of larva I have seen have been 

 got in old tanks about human habitations, just the working 

 ground where it is of greatest use. So that we have in it 

 an ally, which, if used, may be the means of greatly 

 reducing the numbers of those which are not only a 

 nuisance, but a danger to the health of the community. 

 No attempt has ever been made in any country to use 

 them for this purpose, so that Queensland might have the 

 honour of leading the van in the contest. 



