57 



CHAPTER IV. 



FLIES (CONTINUED) AND FLEAS. 



{DIPTEBA AND APHANIPTEBA). 



Gout Fly, Cattle Flies, Flea, &c. 



Fig. 47. — Wheat-bulb Fly (Hijlemyia coarctata), magnified, and 

 lines showing nat. size ; mafrgots and chrysalids, nat. size and mag. ; 

 mouth apparatus, and extremity of tail, with tubercles, mag. ; 

 infested plant. 



Looking at the many hundreds (or perhaps it might 

 rather be said thousands) of species which exist of 

 British FHes, and also considering the great resem- 

 blance which many of them, as well as of their 

 maggots respectively, bear to one another, it is plainly 

 impossible for anyone who does not give special 

 attention to the subject to know more than a limited 

 number with certainty. But still something may be 

 done towards gaining a useful knowledge of them, by 



