DIPTERA. 495 



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 antennae, except one 

 subgenus or Phora, have always appeared to be inserted near the 

 front. The larvse 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. 



This second section will form our last family of the Diptera. 



FAMILY VI. 

 PUPIPARA.(l) 



These insects, at least the Hippoboscae, were distinguished by 

 Reaumur, under the analogous appellation of Nymphipara. 



Their head, viewed from above, is divided into two distinct areae 

 or parts. One posterior, and more particularly composing 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 

 posterior large and coriaceous, bearing the antennas on its sides, 

 and the other constituting the apparatus of manducation. The in- 

 ferior and oral cavity of the head is occupied by a membrane; from 

 its extremity issues a sucker arising from a little bulb or projecting 

 pedicle, composed of two closely approximated threads or setae, and 

 covered by two coriaceous, narrow, elongated, and pilose laminae 

 which form its sheath. 



The body is short, tolerably broad, flattened and defended by a 

 solid skin almost of the consistence of leather. The head is more 

 intimately united to the thorax than in the preceding families. The 

 antennae, always situated at the lateral and anterior extremities of 

 the head, sometimes form a tubercle bearing three setae, and some- 

 times little hairy laminae. The eyes vary as to size; in some species 

 they are very small. 



(1) Born in the pupa state. 



