Introduction. xxxiii 



Hexapoda — continued books and papers damaged by book-worms {Atropos 



divinatoria) and by CTielifers or tailless scorpions in 

 India, also by Lepisma. Clotbing also damaged in 

 India by Anthrenus vorax. 



Cbilopoda and Diplopoda None. 



Tunicata to Birds None. 



Mammalia Mice and rats (occasionally). 



Survey of Sub-group C. 

 animals injurious to man's food and other stores. 



Protozoa to Crustacea None. 



Acarina A few acari attack food — housebold raites (^Olyciphagus) ; 



cheese mites (Tyroglyphus) ; sugar mites (GlycipJiagus). 



Hexapoda Numerous insects attack man's food and other stores, 



both dry goods and fresh — com weevils {Calandra) ; 

 bacon beetles {Dennestes) ; cheese fly {Piophila) ; blow 

 flies {CallipJuyra) ; cockroaches {Blattidx) ; cigar 

 beetles (Lasioderma) ; drug beetle {Atiobium paniceum) ; 

 death-watch (4 fropos divinaUn-ia) ; silver fish (Lepisma). 



Chilopoda and Diplopoda None. 



Mollusca Slugs attack corks. 



Tunicata to Birds None. 



Mammals Rats and Mice. 



GROUP G. 



Animals which are known as " Beneficials " on account of their 

 being destructive of or checking the increase of the 

 injurious Animals classed under Groups D, E, and F. 



The animals falling in this group, spoken of as a rule as " natural 

 enemies," are best treated in connection with the pests enumerated in the 

 groups D, E and F. They may be beneficial, either by (i) being pre- 

 daceous, or (ii) being parasitic upon the pests of crops, animals, and man. 



Survey op Group G. 



Protozoa None. 



Porifera to Echinoderma None. 



Platyhelmia Parasitic cestodes help to keep down certain noxious 



birds and mammals (rabbits, sparrows, and others). 



Nemertina None. 



Nematoda Act the same as Platyhelmia. 



Crustacea None?. 



Arachnida Spiders by destroying noxious insects; mites (Der- 



manyssus) by being parasitic on destructive birds. 



Hexapoda Many insects prey upon other insect pests. Hover flies 



(Syrphidie) and lace-wing flies (Henicrobiidx) feed upon 

 Aphides ; dragon flies {Odonata) upon mosquito larvae, 

 butterflies, etc. ; carnivorous ground beetles (Carabidm, 

 etc.), lady birds (Coccincllidai) upon Aphides and scales. 



C 



