u 



CLASSIFICATION. 



DESCRIPTION OF DIPTERA. 



1st. — Wings: Two, as organs of flight, membra- 



nous, vems 



irregular 



back of the 



are two little ]^:nohs on stems, answering as 

 balancers ; these represent the second pair of 

 wings. 

 2d. — Mouth jycirts, for swQXdwg and piercing, con- 



of an absorbino: 



called the 



tongue, and the jaws developed as sheathe, 

 ) answering the purposes of lancets. 

 3d. — Iransformations, complete. The larva3 are 

 fleshy, cylindrical, footless grubs, though 

 among some species are representative legs ; 

 head of the larvre in this sub-order alone is 

 soft, flesliy and variable. 



Breathino' oro-ans in most from the end of 

 the body — aquatic and terrestrial. Pupa in- 

 complete or coarctate. 



FAMILIES OF DIPTERA. 



Culicidfe mosquitoe and gnat family). 

 Cecidomyida) (gall fly family). 

 Tipulidie (crane fly family). 

 Mycetophilidse, empidas. 

 PulicidtT3 (flea family). 

 Simulidae, bibionidse. 

 Stratiomyid?e (weapon flies). 

 Tabanidffi (horse fly family). 

 Asilida^ (robber fly family). 

 Therevidae (dagger flies). 

 Syrphida3 (plant lice eaters). 



