318 INSECTA. 
In the Diptera of which we have hitherto spoken, we have 
found a sucker received into the superior canal of a tubular 
sheath, more or less membranous, geniculate at base, most 
frequently terminated by two lips, and accompanied by palpi. 
The antenne, except in the last subgenus or Phora, have 
always appeared to be inserted near the front. The larve 
of these Diptera, although susceptible of being hatched in 
the venter of the mother, live abroad and feed on various 
substances, vegetable or animal. ‘These Insects have formed 
our first general section which is divided into five families. 
Those of the second differ in all these respects and in some 
others that are less general, and this dissimilarity has even 
induced Doctor Leach to form the latter into a particular 
order, or that of OmaLopreRA. ‘Those which terminate it, 
and which are destitute of wings and halteres, have a certain 
affinity with the Hexapoda and Aptera that compose our 
order of the Parasita or the genus Pediculus of Linnzus. 
This second section will form our last family of the Diptera. 
FAMILY VI. 
PUPIPARA. 
These Insects, at least the Hippobosce, were distinguished 
by Reaumur, under the analogous appellation of Mymphipara. 
Their head, viewed from above, is divided into two dis- 
tinct are or parts. One posterior, and more particularly com- 
posing the head, gives origin to the eyes and receives the 
other part in an anterior emargination. The latter is also 
divided into two portions, the pesterior large and coriaceous, 
bearing the antennz on its sides, and the other constituting 
the apparatus of manducation. ‘The inferior and oral cavity 
of the head is occupied by a membrane; from its extremity 
issues a sucker arising from a little bulb or projecting pedi- 
