353 



CHAPTEK XXVII. 

 D i p T E R A. (continued). 



BRACHYCERA, the second large section of the Pro- 

 boscidae, contains seventeen families : 



1. Stratiomidae (Soldier-flies) . 



2. Xylophagidae. 



3. Tabanidae (Horse~flies). 



4. Acroceridae. 



5. Asilida3. 



6. Leptidae. 



7. Bombylidae (Bee-flies). 



8. Scenopiuidae. 



9. Empidae (Snipe-flies). 



10. Dolichopidae. 



11. Lonchopteridae. 



12. Platypezida?. 



13. Pipunculidae. 



14. Syrphidas (Dragon-flies, dc.). 



15. Conopidae. 



16. Muscidae (Houseflies, &c.). 



17. (Estridas (Gadflies). 



These families- form three groups, distinguished chiefly 

 by the character of the metamorphoses. 



In the two first the pupa remains within the skin of 

 the larva, which retains something of its original 

 form. 



A A 



