DIPTERA PUPIPARA. 



753 



the mouth-parts are much modified. Hippobosca equina (Fig. 481) is the 

 Horse- or Forest-fly well known in Britain. Melophagus ovinus (Fig. 482), the 

 sheep tick, has lost all resemblance to normal Diptera ; it is wingless and 

 creeps amongst the 

 hairs of sheep. There 

 are other species which 

 attack birds, and these 

 for the most part retain 

 their wings. 



Fam. 72. Braulidae. 

 Antennae not so well 

 hidden as in the pre- 

 ceding family, from 

 which this one differs 

 also in the structure 

 of the mouth-parts. 

 Eyes imperfect. This 

 family consists of a 

 single, minute, wing- 

 less species, Braula 

 coeca, which lives on bees, usually on the thorax (Fig. 483). 



Fam. 73. Streblidae. Winged insects with halteres, and narrow, 

 free head. The insects of this family are rare and live on bats. The 

 larvae are said to live in the dejecta of their hosts. 



Fam. 74. Nycteribiidae. Head upright or bent back on to dorsal 

 surface of thorax. Wings absent. Legs long, borne on the upper surface 

 of a chitinous plate formed by the meso- and meta-sterna ; so that the 



FIG. 483. Braula coeca. 



(after Meinert). 



FIG. 484. Nycteribii, sp., from Xantharpyia straminea. Aden. A upper surface of female 

 with head in the position of repose ; B under surface of male, x V. From Sharp. 



z in 3 c 



