BLOOD-SUCKING NEMATOCERA : SIMULIIDjE 127 



The water thus turned stagnant might, to complete the 

 business, be blasted with dynamite, or (with infinite caution) 

 poisoned. In the United States Phinotas oil — a heavy oil 

 that sinks — has been applied even to running streams with 

 much success. The exactly opposite course of deepening 

 and clearing the bed of the stream, so as to accelerate the 

 current and sweep away the larvae, has also been recom- 

 mended. To repel the adult flies (females) some distasteful 

 application may be used ; for animals, an ointment of tar 

 or petroleum ; for human beings, a lotion of some powerful 

 essential oil made up with a solution of quinine or an 

 infusion of quassia. 



