THE STABLE-FLY 127 



is concave, and the antennae bear hairs on 

 the upper side only and not above and below 

 as they do in the domestic fly. 



As a biting-fly and a blood-sucking fly, 

 the habits of Stomoxys naturally differ from 

 those of Musca domestica ; but, like the latter, 



Fig. 39. — Wing of Musca domestica above, 

 and of Stomoxys calcitrans below. 



its distribution is almost world-wide. It is 

 found in all temperate and tropical countries, 

 and extends as far north as Lapland. But it 

 is perhaps most abundant (or shall we say 

 it has been most observed ?) in temperate 

 climates and during the summer months. 



In any farm or country house large numbers 

 of Stomoxys calcitrans are found in and about 

 the cowsheds and stables, and in warm weather 

 the same is true wherever cattle are grazing 



