222 CLASSIFICATION OF INSECTS. 



six-jointed; basal joint long, second and third long and 

 incrassated, the remaining ones short and 

 decreasing to a point ; ligula long, por- 

 rected; wings narrow, divaricating; alula 

 obsolete ; body elongate, narrow, re- 

 curved. Inhabits woods, feeding on com- 

 posite flowers, and occasionally, it is said, 

 sucking the blood of cattle. Conops. 

 Bots, breeze-flies or (Estrites. Larva 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 an- 

 tenna; 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 ob- 

 solete ; wings divaricating ; alulae moderately large ; body 

 pilose, short, stout. Inhabits meadows and commons, flying 

 about cattle in order to deposit its eggs. CEstrus, repre- 

 sented in all its states at page 24. 



Ant-lion flies or Leptites. Larva elongate, rather atten- 

 uated 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 situation. Imago with antenna 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, 

 membranous, bilobed ; the maxillary feelers long, two- 

 jointed and porrected ; ocelli three ; wings long, divaricat- 

 ing, often spotted ; alula obsolete. Inhabits moist hedges ; 

 preys on small insects. Leptis, Atherix, Rhagio. 



Downy flies or Therevites. Larva very elongate, with 

 two air-tubes at the posterior extremity, and the divisions 



