30 



BRITISH FLIES 



strong and conspicuous, running into the basal half of the 

 costa, but the subsequent ve\s very faint and incomplete and 

 abnormally directed ; discal, postical, and anal veins very 

 difficult to trace. Palpi porrect, not jointed. Eyes widely 

 and equally separated in both sexes. Antennse apparently 

 composed of one large joint which hea^vs a very long apical or 

 dorsal arista. Hind legs long and the femora flattened. 



•HYPOCERA— XVI. Phorid.E. 



Fig. 53. — Phoraiiiiiana i. x 10. 



The Phoridw are always small flies of greyish black or yellowish 

 colour, which may be known at once by their peculiarly characteristic 

 venation. They are quick running, humpbacked flies, and some species 

 are ahvays common on windows. 



METAMORPHOSES 

 OF THE DIPTERA ORTHORRHAPHA BRACHYCERA. 



The most elaborate systematic worker of recent times upon the 

 metamorphoses of Diptera was Brauer, who classified the whole of the 

 Diptera from larval characters (Denkschr. Akad, Wien., xlvii., 1883), 

 but one of the pioneers was Haliday, who in a little known paper (Nat. 

 Hist. Rev., iv., 177, 1857) indicated the main hues. 



This is a subject upon which I have no personal knowledge, and, 

 while I might have made an imperfect translation of Brauer's tables as 

 far as the Brachycera were concerned, I have had the good fortune to 

 cret Dr D. Sharp to write an original paper upon the distinctive characters 

 which exist in the larval stage of not only the Brachycera, but also of the 

 families {Platyijezida:, Pijmnculuke, and Syrphida-) which were included 

 in my previous volume. 



