THE DIPT ERA. 39 * 



are well shown in the case of the common house fly. The meta- 

 morphoses differ, therefore, considerably in this very natural group. 

 There are two great divisions in the order of the Diptcra 



THE METAMORPHOSES OF THE GNAT. 



characterised by distinctions in the antennae; the first section 

 have thread-shaped and the second very short antenucx, consisting 

 of three very distinct joints, and a slender thread which is 

 called a style. The first section, the Ncvioccra, have long and 



