444 ANIMALS INTRODUCED UNAWARES 



labourers discharging the cargoes in order to keep them at 

 work. In several widely scattered places in Europe, Africa 

 and America the presence of.the Grain Mite has been betrayed 

 by its evil deeds. 



ALIENS IN BISCUITS 



How many voyagers on ships, rejecting " weevily " bis- 

 cuits put before them, have realized that they were helping 



Fig. 72. Piece of Dog Biscuit perforated by Biscuit Beetles (Sitodrepa panicca). ' 

 Lying on the surface are other insects found amongst biscuits. Natural size. 



to add new elements to old faunas ? It is matter of common 

 knowledge that biscuits carried on board ship during a long 

 voyage become riddle'd by the grubs and adults of Biscuit 

 Beetles, especially Sitodrepa (Anobiuni) panicea, and this 

 even although the greatest precautions are taken in packing 

 and preserving the food. Many species of Beetles, and of 

 Moths as well, have been distributed over the world through 

 the unconscious wanderings of biscuits. Even before the 

 Great War, the ration biscuits supplied to the widely scat- 

 tered outposts of our Empire were frequently found unfit 



