V 



Genus Chrysops. 



Front with a tubercle or callosity. Three ocelli. Second 

 segment of antenna almost as long or as long as first. Eyes 

 golden green. Flight silent. Wings widely separated ; spotted. 

 Hmd tibiae spurred. Species about a hundred and fifty. 



.Ch. caecutiens attacks the eyes especially. 

 Genus Silvius. 



Second antennal segment very much shorter than first. 

 Wmgs without any spots. Third antennal segment five rings 

 as in Chrysops. Species about twenty-six. 



S-l ..lU Cl.T 



Fig. 92 



2. Tabaninae 



The two most numerous genera are Tabanus and 

 Haematapota. 



(a) Front much longer than broad. Frontal tubercle 

 when present not transverse. 



Genus Tabanus. 



Proboscis short and thick ; vertical in the female, oblique 

 in the male. Antennae scarcely longer than head. Third 

 segment five rings. First ring is characteristically notched in 

 shape of a crescent with a basal process {Vide Fig. 91). Eyes bare. 

 Large flies with humming flight. Species about a thousand. 



(6) Front as broad as it is long or broader. Frontal 

 tubercle transverse, about four times as broad as long. 



Genus Haematapota. 



Terminal segment of antennae not crescentic. Third segment 

 has four rings. Wings adjacent like the side of a roof. They 

 hav.e transparent markings. No ocelli. Flight silent. About 

 fifty species. 



B 1 



