238 



DIPTEEA OK TRUE FLIES. 



water and some deodorant, to deter the fly from ovipositing. 

 Salt is said to be good, but how it works is unaccountable. 

 Tartar emetic in two-drachm doses every day for ten days is 

 said to clear the "bots" out of the stomach. Other species, 

 such as G. nasalis and O. hcemorrhoidah's, live in a similar way. 



Several other "bot-flies" occur in Britain (Hypoderma diana 

 and Gephenomyia rufiharbis, both on deer). Man is attacked 

 by HyiMderma linearis and H. bovis in Europe and America 

 (so-called Creeping Disease), and by the Dennatobia cijauicrniiris, 

 or the Torcel Fly, in S. America, and others. 



Root-eating Flies (Anthomyidse). 



The Anthomyidse include a great number of flies which are 

 all more or less dull in colour, and covered with many bristles 

 and hairs. Their larvae are white footless grubs, which taper to 



Fig. 133. — Root-eating Flies. 



1, Larvix of Vhorbia brassicce ; 2 and 3, pupai'ium of P. 6rn.«(rrr ; 4 and 5, A, radif^um ; 

 G and 7, larvtp of HoDialomym ; 8 and 9, Homalomyia sp. (?) 



a point towards the head end, and are blunt at the posterior 

 end. Several are very injurious to crops. No full description 

 of the adults will be given here, as they are all much alike : 

 only specialists are able to identify them with any certainty. 



