39 1 



(3) Genus Silvius. Second antennal segment 

 very much shorter than first. Wings without any spots. 

 Third antennal segment five rings as in Chrysops. 

 Species about twenty-six. 



Fig. 122 



2. Tabaninae 



The two most numerous genera are Tabanus and 

 Haematapota. 



(a) Front much longer than broad. Frontal 

 tubercle when present not transverse. 



(1) 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 (Fide Fig. 121). Eyes 

 bare. Large flies with humming flight. Species about 

 a thousand. 



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

 tubercle transverse, about four times as broad as long. 



(2) Genus Haematapota. Terminal segment of 

 antennae not crescentic. Third segment has four rings. 

 Wings adjacent like the side of a roof. They have 

 transparent markings. No ocelli. Flight silent. About 

 fifty species. 



