476 



THE STUDY OF INSECTS. 



Family CONOPID/ (Co-nop'i-dae). 

 The Thick-head Flies. 



With the members of this family the head is large, being 

 broader than the thorax. The body is more or less elon- 

 gate ; sometimes the abdomen has a long, slender pedicel 

 like that of certain wasps. The body may be naked or 

 thinly clothed with fine hair, but it is rarely bristly. 



The ocelli may be either present or absent. The an- 

 tennae are prominent, and project forward; they are three- 

 jointed ; and the third segment bears either a dorsal bristle 



V, 



Vlh+TX 

 FIG. 582. Wing- of Conors affinis. 



or a terminal style. Vein III of the wings (Fig. 582) is only 

 three-branched. The last branch of vein III and the first 

 branch of vein V end near together or coalesce at their tips. 

 Cell V 2 is divided by a cross-vein. Vein V 3 coalesces with 

 vein VII, for nearly its entire length. Veins V1I 2 and IX 

 coalesce at their tips, and sometimes for 

 nearly the entire length of vein VII,. 



The adult flies are found on flowers. 

 In some genera the abdomen is long, with 

 a slender, wasp-like pedicel (Fig. 583). In 



others the abdomen is of the more usual 

 F IG . s *3.-co*ot*. form The ] aryae are paras j t j C; chiefly upon 



bumblebees and wasps, but some species infest locusts. 



