XXIII 



IN SECT A : DIPTERA 



349 



the thorax. The pupa may swim in the water, though it 

 usually rests motionless at the surface. In time the pupal 



Fig. 271. — Pupa of Chironomus. 

 (Its real size is shown in the .small figure.) 



skin splits, and after a very brief pause, of a few seconds 

 only, the perfect Harlequin-fly rises into the air.^ 



The Larva. 



The " Splay-footed " Fly ^ {Tanypus). 



Another frequent inmate of the same rain- 

 water tub as the larvae of the gnat and the 

 Harlequin, is the Tanypus larva, a small, yellow-brown, 

 thread-like creature which swims actively through the water 



' For a full detailed account of Chironomus see The Harlequin Fly, by 

 Miall and Hammond. 



^ The name refers to the peculiar appendages of the larva. 



