CLASSIFICATION OF INSECTS. 197 



distinct. Inhabits the common starling. No 

 British genus. 



698. Horse-flies (Hippoboscites). Larva, apod 

 and nearly spherical, is nourished and attains per- 

 fection in the ovary of its parent. Pupa changes 

 in the same situation, and is produced in the state 

 in which it undergoes the final change ; its struc- 

 ture is nearly as in the Musettes, excepting an 

 evident indentation at the end, which becomes the 

 lower extremity of the future imago. Imago 

 with triarticulate antennae, the second joint most 

 developed, and the third originating in a hollow 

 or socket near the base of the second ; mouth 

 apparently adapted for suction, its component 

 parts appear to be two mandibles, two maxillae, 

 and a sheath-like labium ; tarsi five-jointed ; 

 occasionally with the fore wings developed, and 

 the hind wings appearing as poisers. Infests 

 quadrupeds and birds. Hippobosca, and the 

 genera separated from it. 



699. Bat-flies (Nycteribiites). Larva and pupa 

 as in the preceding order. Imago with the an- 

 tennae obsolete ; the mouth situated on the back 

 of the prothorax, in which the head seems sunk ; 

 parts of the mouth obsolete or unascertained ; 

 wings entirely obsolete ; legs, with the femora and 

 tibiae, each two-jointed, the tarsi five-jointed. In- 

 fests bats. Nycteribia, 



