HIPPOBOSCA. INSECTS. 391 



forehead ; abdomen ferruginous, elongated, conical, terminated 

 in the female by a long perforator ; feet pale yellow, or ferrugi- 

 nous. Inhabits Europe Nouv. Diet. xxi. 441. 



SECTION II. 



The proboscis in this section consists of a sucker of two setae, arising from the in- 

 terior of the buccal cavity, and covered by two plates or palpi in place of a sheath. 

 The ordinary sheath, or the part analogous to the lip, is wanting or only rudimen- 

 tary. Sometimes the head is received posteriorly into a notch of the thorax, or al- 

 most fixed to it ; in other ca'ies it appears under the form of a tubercle inserted ver- 

 tically upon the thorax. The hooks of the tarsi seem double or triple. Many are 

 destitute of wings. The larvae live in the interior of the parent, and when extruded 

 pass immediately into the pupa state. The cocoon formed by the primitive skin 

 resembles a bean, with a rounded space at one of the ends of a darker colour. The 

 perfect insect lives on mammalia and birds. Its skin is elastic, and resists ordinary 

 pressure. 



FAMILY V. PUPIPAR.E. 



TRIBE I. CORIACEJS. 



Many have wings ; head and eyes of ordinary form and size ; 

 thorax square. 



I. With wings and balancers. 



Gen. HIPPOBOSCA, ORNITHOMYIA. 



II. Wings none or imperfect ; no balancers. 



Gen. MELOPHAGUS. 



Gen. HIPPOBOSCA, Lat. 



Body oval, flattened, covered in the greater portion with a co- 

 riaceous elastic skin ; head small, rounded, horizontal and 

 attached to* the thorax by a neck ; antennae inserted near the 

 mouth, and each lodged in a cavity ; eyes large, oval, on the 

 sides of the head ; sucker filiform and projecting ; thorax 

 large ; scutellum transverse ; wings large, horizontal, with 

 strong nerves near the sides ; abdomen soft, not distinctly 

 annulated ; feet short. 



H. equina, Lin. Eyes blackish ; head yellow, flattened ; thorax 

 coloured brown and yellow ; abdomen broad, short, yellow, with 

 brownish spots ; under part of the body pale yellow ; wings white 

 transparent, much longer than the body, and rounded at the ex^ 

 tremity ; all the body slightly covered with hairs. 5 lines long" 

 Inhabits Europe, on horses, oxen, and dogs. Shaw, vi. pi. 114.* 



These animals suck the blood of horses, and horned cattle, and are often found 

 upon the dog. They attack the parts least covered with hair. 



TRIBE II. PHTHYROMYLE. 



Body always apterous ; head very small, and in the form of a 

 capsular tubercle implanted on" the thorax ; eyes small, gra- 

 nulated ; thorax semicircular. 



Gen. NYCTERIBIA, Lat. 

 Head distinct from the thorax ; two short antennae, of two joints, 



