COMMON FLIES AND HOW TO TELL THEM APART 151 



cata. However, these slits are not directed toward those of the opposite 

 plate but are sub-parallel to them. The stigmal field is strongly depressed 

 to form a deep pit, and the stigmal plates are at the bottom of this pit. 

 The segments of the body bear complete rings of spinose areas, and often 

 supplementary pads on the sides. 



Sarcophaga larvae prefer animal matter, breeding extensively in car- 

 casses. They have been found in cheese, oleomargarine, pickled herring, 

 dead insects, and human feces. A species was also reared from decaying 

 vegetables. 



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vols., London, 778 pp. 52 pis., 108 figs. 

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Observed in the City of Liverpool, with Suggestions as to the Best 



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