380 INTRODUCTION TO ZOOLOGY CHAP. 



Family 2. Syrphidae. 1 



Genera. Syrphus (Hover-fly). 

 Volucella. 



Eristalis (Drone-fly). 

 Family 3. Stratiomyidae. 1 



Genus. Stratiomys (the Chameleon-fly). 

 Sub-order 2. Nemocera. 



Family 1. Culicidae. Gnats. 



Genera. Culex (the Common Gnat or Mosquito). 

 Anopheles (the Spotted Gnat, the 



Malarial Mosquito). 

 Coretlira (the Phantom-fly). 

 Family 2. Chironomidae. 2 Midges. 



Chironomus (the Harlequin-fly). 

 Tanypus (the "Splay-footed fly"). 

 Ceratopogon (the Horn-bearing fly). 

 Family 3. Simuliidae. 2 



Simulium (the River Sand - fly or 



Buffalo-gnat). 

 Family 4. Tipulidae. 



Tipula (Daddy-long-legs or Crane- 

 fly). 

 Family 5. Cecidomyidae. 2 Gall-midges or Gall-gnats. 



Species. Cecidomyia taxi (the Yew Artichoke 



Gall-midge). 



Cecidomyia destructor (the Hessian-fly). 

 Cecidomyia ulmariae (the Meadow-sweet 



Gall-midge). 

 Sub-order 3. Aphaniptera (sometimes separated as a distinct 



order). 

 Family. Pulicidae. Fleas. 



Pulex irritans (the Common Flea). 



PRACTICAL NOTES ON DIPTERA NEMOCERA 



1. Examine the contents of any rain-water tub during the 

 summer months ; probably several different kinds of dipterous 

 larvae can be obtained from it with the aid of a small muslin net. 

 Sort these out, transferring some of each kind to a separate tank 

 of clean rain-water, at the bottom of which a layer of mud and 

 decaying leaves has been allowed to settle. 



1 For identification of species of these families see G. H. Yen-all's 

 British Flies, vols. v. and viii. 



2 For detailed account of these families see Theobald's British Flies, vol. i. 



