Diptera 



265 



bov'n) of the Ox ffig. 145), live just beneath the skin through which 

 they bore holes when full fed and bury themselves in the ground for 

 the pupal stage. The family is not numerous in genera and species 

 but is very widely distributed. 



The three next families of the Cyclorrhapha may be distinguished 

 from the Syrphids and allied families by the short basal cell of the 

 wings, and from the CEstridz by the presence of w^eil-deveioped 

 sucker and palps. They form the group Muscaria and include the 

 most familiar flies. 



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Fig. 147. — Larva of Hiematobia. a. Side, and b. ventral views of head and 

 fore-body, magnified (with vestigial feeler and spiracle more highly magni- 

 fied) ; c. dorsal view of hinder-end of larva with spiracles ; e. ventral view 

 with anal plate ; d. anal plate of puparium, magnified. From Riley, Insect 

 Life, vol. 2 (U.S. Dept. Agr.). 



Muscidae. — The MuniJa- are an exceedingly large family, dis- 

 tinguished from the other two families of the Muscaria by the 

 presence of scales behind the wing-bases, in conjunction with a sharp 

 bending upwards of the median ; fourthj nervure towards the ulnar, 

 which it touches, or almost touches, on the wing-margin. The 

 Muscida; are, for the most part, ash-coloured or metallic flies of mod- 

 erate size, often with many stifl" bristles ; only four to six abdominal 

 segments are visible (fig. 146;. The larvae are white, fleshy maggots, 



