332 INSECTS ATTACKING STOCK AND POULTRY 



twice before adding them to your flock. This will destroy all 

 external parasites. This dip could also be used, in about this 

 strength, on other animals suffering with any external parasite. 



Other Control Measures. Infested stables or pens should be 

 sprayed with the same mixture, or with kerosene emulsion, and 

 the sheep kept away from them for four weeks. Whitewashing 

 the interior of such buildings or pens after spraying is naturally 

 a good measure. The dipping pen is an important furnishing of 



FIG. 333. Sheep badly infested with scab. 



every sheep farm. Scabby sheep should not be driven along a 

 public highway, for evident reasons. Keep sheep out of pastures 

 previously occupied by infested sheep. 



The Sheep Tick. This species (Melophagus ovinus Linn.), 

 formerly called Hippobosca ovinus Linn., is found the world over, 

 wherever sheep are kept. The sheep tick (Fig. 334) is about one- 

 sixth of an inch long, a wingless and degenerate fly, and is apt to 

 be common where sheep are kept in crowded quarters. It is only 

 when sheep are crowded together that this parasite crawls from 

 one animal to another. The adult female brings forth young in 



