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). Pabaninae. 
He of ~fd hanv-i s}. ( after J>ela find) 
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 Chrysops. —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. 
