
DIPTERA. 53 
ing quickly and suddenly away a yard or two, again taking up 
the same immovable position, and in each of these movements 
turning the head to the opposite way from that in which they are 
going. ‘This naturalist is certain that on these occasions they are 
watching for the females, which they dart upon. When they 
have succeeded in doing so, they rise so high as to be out of 
sight. 
To this group belongs the genus Tabanus. 
The first species we shall mention, Tubanus autumnalis (Fig. 
33), a common species, is eight or nine lines in length, and of 

Fig. 33.—Tabanus autumnalis. Fig. 34.—Chrysops ceecutiens. 
blackish colour. The palpi, the face, and the forehead. are grey ; 
the antenne black; the thorax grey, striped with brown; the 
abdomen spotted with yellow, the legs of a yellowish white, and 
the outer edge of the wings brown. 
Another species (Tubanus bovinus) is twelve lines in length, and 
-of a blackish brown. The palpi, the face, and the forehead are 
yellow, the antennze black, with a whitish base; the thorax, covered 
with yellow hair, is striped with black ; the posterior edge of the 
Segments of the abdomen pale yellow; the legs yellowish, with 



