DIPTERA. 



467 



like cross-veins. The only other families of the suborder 

 Orthorrhapha in which this occurs are the two following ; 

 and the venation of the wings in each of these is very differ- 

 ent from that of the Empididae. 



The antennae are three-jointed ; the first and second 



Til, 



4+5 



VIIi 



FIG. 569. Wing of Rhantphontyia. 



segments are often very small, and then appear like a single 

 segment ; the third segment may or may not bear a style or 

 bristle. The mouth-parts are in many cases long, and ex- 

 tend at right angles to the body or are bent back upon the 

 breast. 



These flies are predaceous, like the robber-flies ; but they 

 also frequent flowers. The larvae live in decaying vegetable 

 matter, but are probably carnivorous. The pupae are free. 

 The family is a large one, containing many genera and 

 species. 



Family DOLICHOPODID^: (Dol-i-cho-pod'i-dae). 

 The Long-legged Flies. 



These flies are of small or medium size and usually 

 bright metallic green in color. The legs are 

 much longer than is usual in the families 

 belonging to the series of short-horned flies 

 (Fig. 570). This suggested the name Do- 

 lichopus (Do-lich'o-pus), which means long- 

 footed, for the typical genus ; and from this FlG S70 .- Dolicko . 

 the family name is derived. It should be 



pus lobatus. 



