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54 



OJilO E-XT^JRlirEST.^TVnOX: BULLETIN 356 



one on each side of the median line of the head, between and a little 

 above the eyes. The frontal sinuses communicate with the nasal 

 passages but are separated from the brain by a thick, bony plate. 

 Here the larvae live through the winter, feeding upon the abundant 

 mucus found there. In the spring, about shearing time or later, 





Sheep Bot — Oestrus ovis adult, larvae, puparium and young larvae 



