DISTRIBUTION OF INJURIOUS INSECTS 3 



{Dactylopius nipce, Maskell) new to Britain has been sent to me 

 on palms from Blackheath. It was originally described from 

 Demerara, and has also occurred at Bournemouth in Hampshire. 

 The introduction of injurious insects can only be stopped by 

 legislation. We find that most ot the countries of the world 

 have regulations protecting them from foreign importations, 

 such as " An Act to prevent the introduction and provide for 



R K A N S A S 



Mexico 



Fig. I.— Area in Louisiana infested by the 

 Cotton Boll Weevil in December 1904 

 (after Newell). 



'MEXICO 



Fig. 2. — ^Area in Louisiana infested by the 

 Cotton Boll Weevil in November 1905 

 (after Newell). 



the eradication of disease affecting orchards and gardens" in 

 New Zealand. 



We may also get greatly increased local distribution by 

 natural methods. As an instance of rapid natural distribution, 

 we may mention the Cotton Boll Weevil. The beetles migrate 

 in definite directions, and at certain times of the year. How 

 great this distribution may be we can best judge by a glance 

 at the figures showing the range of this serious cotton pest in 

 Louisiana in 1904 and 1905 (figs, i and 2). 



