Larva of CEstrus Ovis in the Nasal Sinuses of Sheep. 117 



Prevention. Some turn up a furrow in the pasturage, in which 

 the sheep may burrow their noses and evade the fly, others lay 

 down quickUme in covered boxes which has the further advant- 

 age of inducing sneezing and favoring expulsion of the entering 

 parasites. But perhaps the best plan is to procure a log and bore 

 a number of holes in it with a two inch augur ; place salt in the 

 holes and smear their margins with tar, and renew it often. The 

 sheep then takes a protective dressing with every lick of salt. 



CEstrus Purpureus (Brauer) is a species which infest the 

 nose, etc., of the Syrian sheep, and Cephalemia Maculata 

 (Wedl) one which infests the nasal chambers of the Egyptian 

 buffalo and camel. 



