ATTEMPTED DIVISION OF BRITISH INSECTS. 397 



unknown ; maxillae short, their feelers apparently exarticulate, 

 short, erect ; ocelli none ; fore-wings short, not formed for 

 flying; hind-wings assuming the form of halteres, small, but 

 distinct. Inhabits the common starling. The only species at 

 present described is Camus hcemapterus.) 



Natural Order. — Hippoboscites. 



Larva, apod and nearly spherical, is nourished and attains perfection 

 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 structure is nearly as in the Muscina, 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. 

 Infects quadrupeds and birds. Hippobosca, and the genera se- 

 parated from it. 



Natural Order. — Nycteribites. 



Larva and pupa as in the preceding order. Imago, with the 

 antennae, obsolete ; the mouth situated on the back of the pro- 

 thorax, 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. 

 Infests bats. Nycteribia. Authorities for these characters, 

 Leach and Latreille ; they are not written from actual investiga- 

 tion, and appear somewhat unsatisfactory. 



Situation at present doubtful. 

 Natural Order. — Stylopites, Bee-parasites. 



Larva apod, with a hard corneous head ; inhabits the bodies of bees 

 in the imago state, feeding on those parts not positively essential 

 to life. Pupa changes in the same situation. Imago, when 

 hatched, comes from between the segments of the body, generally 

 between the protelum and paratelum ; antennae six-jointed, the 

 joints variously developed in the genera ; labrum distinct ; 

 mandibles linear and rigid ; maxillae less developed, each bearing 

 an exarticulate feeler ; labium triangular and pointed, bearing no 



