39 



1. Hind tibiae with spurs at the tip ; ocelli in 

 most cases present Pangoninae. 



2. Hind tibiae without spurs at the tip ; no ocelli 

 (simple eyes) Tabaninae. 



Fig. 121 



i . Pangoninae 



(1) Genus Pangonia. Face and front in ? without 

 tubercles or - callosities. Proboscis often long, thin, 

 horizontal. In some, three to four times length of 

 body, piercing, even when the fly is on the wing. Third 

 segment of antenna, eight rings. Species about two 

 hundred and fifty. 



(2) Genus Cbrysops. Front with a tubercle or 

 callosity. Three ocelli. Second segment of antenna 

 almost as long as first. Eyes golden green. Flight 

 silent. Wings' widely separated ; spotted. Hind 

 tibiae spurred. Species about a hundred and fifty. 



Ch. caecutiens attacks the eyes especially. 



