356 



STOMOXYS 



CH. 



held closer together. The most abundant species is Stomoxys 

 calcitrans, the common stable-fly of this country, but in addition 

 to this insect, 5. nigra is also supposed to be concerned in the 

 spread of disease. 



Auxiliary v,ein 



Anl-erior cross-vein 



Fig. 8 1. Wing venation of Stomoxys calcitrans. 



Stomoxys calcitrans Linn. 



General description. This insect closely resembles the 

 common house-fly in colouration and general appearance, but 

 as mentioned above, may be easily recognised by the pres- 

 ence of the biting proboscis and the attitude of the wings. 

 In addition 5. calcitrans is distinguished by the following 

 characters : 



Fig. 82. Side view of head of Stable-fly ; A, proboscis in resting position 

 B, proboscis extended. (After Graham-Smith.) 



