188 GRAMMAR OF ENTOMOLOGY. 



oblong ; feeds in the stomachs, frontal cavities, or 

 backs of quadrupeds ; when full fed it falls to the 

 ground. Pupa changes in the earth, or, if the 

 larva inhabit the stomach, in the dung of the 

 animal it has preyed on. Imago with six-jointed 

 antennae ; basal and second joints short, scarcely 

 distinct ; third large, globose ; the remaining three 

 forming a seta, which is incrassated at the base ; 

 organs of the mouth obsolete ; wings divaricating ; 

 alulae moderately large ; body pilose, short, stout. 

 Inhabits meadows and commons, flying about 

 cattle in order to deposit its eggs. CEstrus. 



676. Ant-lion flies (Leptttes). Larva elongate, 

 rather attenuated at the anterior end; inhabits 

 funnel-shaped holes, which it constructs in loose 

 sand, to serve as a pitfall to small insects, on 

 which it feeds. Pupa changes in the same situa- 

 tion. Imago with antennae five-jointed ; the basal, 

 second, and third joints short, and somewhat 

 globose, but varying much in the genera; the 

 fourth and fifth closely united, and forming a long, 

 slender seta ; ligula large, membraneous, bilobed ; 

 the maxillary feelers long, two-jointed, and por- 

 rected ; ocelli three ; wings long, divaricating, 

 often spotted ; alulae obsolete. Inhabits moist 

 hedges ; preys on small insects. Leptis, Atherix, 

 Rhagio. 



677. Downy flies (Therevites). Larva very 

 elongate, with two air-tubes at the posterior extre- 

 mity, and the divisions of its segments very distinct ; 



