SWINE INSECTS 151 



streams ; these flies often become abundant and in- 

 jurious to cattle and horses but they do not produce 

 'Svarbles" or bots. 



Control — Success has been obtained by putting 

 kerosene oil on pools of water frequented by these 

 flies. They are killed by coming in contact with 

 the oil. Certain repellant mixtures may be put on 

 cattle but diflicult among large herds. Nets on 

 horses are a protection. 



A PEST OF HOGS 



The hog louse ^^ (Hcumatopinus urhis) 

 Order — Hemiptera 



Occasionally this species appears in great num- 

 bers on swine; a full-grown louse measures one- 

 fourth inch or more in length; it is gray in color 

 and has sucking mouthparts. 



Control — Washes of dilute carbolic acid (i to 

 30) or the tobacco extracts or kerosene emulsion 

 will control these lice; a wallowing trough of ce- 

 ment with a film of oil on top is a very good method 

 of control. 



OTHER INSECTS INJURIOUS TO LIVE STOCK 



Turkey gnat (black-flv) (Simulium mcridion- 

 ale). 



Buffalo gnat (black-fly) (Siniuliuin pccuanim). 

 Brown gad-fly (Tabamis exiil). 

 Ear-fly (Chrysops vittafus). 

 Stable fly (Stomoxys calcitrans) . 

 Screw-worm fly (Paralucilia maccUaria). 

 Lone star tick (Amblyonima unipuiicfa). 



Repellants for flies on live stock 

 Many mixtures have been recommended for ap- 



12 Lewis— Oklahoma Expt. Stat., Bull. 72. 



