2 
be swollen, elongated, or normal, and is usually more or less 
scaly ; in the $ the last two joints are long and thin except in 
iEdeomyia. 
The thorax is chiefly composed of the mid-division, the 
mesothorax, which is large and convex ; the prothorax is reduced 
to a pair of lobes — the prothoracic lobes — on each side of the 
mesothorax, between the head and the mesothorax. 
■A . MtHHHjrttph iff Cfilu-Uhtr. 
(Reproduced by permission of the Trustees of the British Museum.) 
The scutellum is very distinct, and may be composed of a 
median and lateral lobes, with a posterior border of bristles, 
or of a single lobe. The metanotum is well developed in all 
save Megarhinus and Toxorhynchites, where it is more or less 
hidden under the scutellum ; it bears neither scales nor bristles, 
