^28 ELEMENTARY ENTOMOLOGY 



o 



ovipositor long 

 and jointed ; 

 wings usually 

 pictured. Fruit- 

 flies. 



TRYPETIDAE 

 QQ. Anal cell not pro- 

 duced ; antennae 

 usually elongated 

 and decumbent. 

 Rather small 

 elongate flies. 



PSILIDAE 



JJ. Squamae large ; front of male narrowed or 



eyes contiguous ; thorax with complete 



transverse suture . . . CALYPTERAE 



A'. Oval opening small ; the mouth-parts 



small or vestigial. Larvae parasitic upon 



mammals. Bot-flies. (Fig. 461) 



OESTRIDAE 



KK. Oval opening of usual size, not vestigial ; 

 hypopleuras with a tuft of bristles ; first 

 posterior cell narrowed or closed ; arista 

 bare or somewhat pubescent. Larva 

 parasitic upon the early stages of other 



insects TACHIXIDAE 



Z. Arista bare on the outer half ; dor- 

 sum of the abdomen rarely bristly 

 on the anterior part. Larva usually 

 feeds on decaying animal matter. 

 Flesh-flies . . SARCOPHAGIDAE 

 LL. Arista entirely plumose ; dorsum of 

 the abdomen usually bristly on the 

 anterior part ; legs long. Larva para- 

 sitic on other insects . DEXIIDAE 

 M. Arista plumose ; abdominal seg- 

 ments without bristles except 

 near the tip ; first posterior cell 

 narrowed or closed. House-fly, 



etc MUSCIDAE 



MM. Arista plumose, pubescent, or 

 bare ; first posterior cell very 

 slightly or not at all narrowed 

 at the margin. Larva are vege- 

 table feeders. ANTHOMYIIDAE 



