CLASSIFICATION OF INSECTS. 193 



mainder forming a seta attached to the third, 

 near its base ; ligula stout, dilated, bilobed : wings 

 as in the Chrysotoxites ; body glabrous, brown, 

 banded with brighter colours. Flies in the sun- 

 shine, settling on flowers. Ascia, Sphegina, 

 Baccha, Eumerus, Psilota, Pipiza, Chelosia, 

 Scceva, Syrphus. 



687. Sun-loving flies (Helophilites). Larva 

 obese, generally furnished with a long tube at the 

 posterior extremity, through which it breathes ; 

 inhabits mud, and all kinds of semi-liquid filth. 

 Pupa changes in the air, attached to walls, &c. 

 Imago with antennae and mouth nearly as in the 

 preceding order ; ocelli three ; body more linear ; 

 hind femora often incrassated and curved ; colours 

 brilliant. Flies in the sunshine, settling on flowers. 

 Helophilus, Xylota, Eristalis. 



688. Bee-flies (Volucellites}. Larva less elon- 

 gate, spined at the posterior extremity ; inhabits 

 the nests of humble bees, feeding on the wax. 

 Pupa changes in the same situation. Imago with 

 antennas six-jointed; the portion forming the seta 

 plumose ; parts of the mouth nearly as in the two 

 preceding orders : ocelli three ; body obese, often 

 very hirsute. Flies in the sunshine, settling on 

 flowers. Criorhina, Sericomyia, Volucella. 



689. Long-tongued flies (Rhingiites). Larva 

 and pupa unknown. Imago with antennae six- 

 jointed, the third joint somewhat cordate ; the 

 portion forming the seta perfectly naked : ligula 



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