DIPTERA. 



103 



viduals are so exceedingly numerous, the genera are 

 few ; Mr. F. Walker enumerating only five. 



Some of the Phlehotomidce are allied to the preceding 

 family, and are blood-suckers, while others are harmless. 

 The extremely common little insects so often seen on 

 window panes with broad sloping wings is one of this 



Daddy-Long-Legs {Tipida oleracea.) 



family. Its wings are thickly covered with hairs, and 

 it is not unlike a small moth. Its name is Psychoda 

 phalcenokles ; the larva inhabits diy cow dung and 

 decayed vegetable matter. It is often popularly, though 

 erroneously, called a midge. 



The Tipulidw are distinguished at once by their very 



