J3 



56 



STOMOXYS 



[CH. 



held closer together. The most abundant species is Stomoxys 

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

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

 spread of disease. 



Auxiliary vein 



An^erio^ cross-vein 



Fig. ,'*r. Wing venation of Stomoxys calcHrans. 



Stomoxys calcitvans Linn. 

 General description. This insect closely resembles the 

 common house-fly in colouration and general appearance, but 

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

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

 In adchtion 5. calcitrans 

 characters : 



is distinguished by the tollo^^ing 



Fig. S2. Side view of head of Stable-fly ; A, proboscis in resting position 

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



