The Gad-Flies or Horse-Flies 



and hibernates in the larval stage, the adults mainly emerging in 

 July after a short pupal period, the eggs being laid without delay 

 and producing larvae a v/eek later. The egg is about 2.5 mm. 

 long, with a diameter of .4 mm., dark-brown, sub-cylindrical, 

 more or less tapering at the end. As they are laid in masses they 

 point obliquely upwards, and are stuck in four or five tiers, one 

 above the other, and all gummed together in a firm mass. The 

 larva is shining and of a transparent, whitish color, with a 

 greenish tinge, marked with conspicuous dark-brown or gold- 

 green irregular bands. The egg is parasitized by the little 

 Hymenopterous insect known as Phanurus tabanivorus Ashm. 



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