THE HOUSE FLY 



77 



ones with aching hearts and the haunting fear that at 

 any moment they might be stricken down, and the pity of 



FT,. 20 



THE BITING STABLE FLY (Stomoxys calcitrant], which transmits 

 infant paralysis. It differs from the House Fly not in size, 

 but in being more distinctly spotted with grey and black ; by 

 the flagellum of the antenna? (i) being hairy on one side only ; 

 by the third long wing vein (2) being less bent than the same 

 vein in the House Fly ; by possessing a hard proboscis (3) 

 containing a lancet, instead of a soft sucking apparatus, as in 

 the House Fly ; by the posterior part of the compound eye (4) 

 being concave instead of straight as in the House Fly. 



(Drawing by Mr. Ignaz Matausch. in " The American Museum 

 Journal'' May 1913.) 



it was they knew not from where the blow would be aimed, 

 and consequently were powerless to prevent it falling. 



