THE BOT- OR WARBLE-FLY 37 



through a lens it was seen that they enter perpen- 

 dicularly to the surface, evidently cutting into the 

 epidermis with their mouth-hooks and occasionally 



Fig. 11. — Entrance hole of H. lineatum 

 maggot into the skin of a cow. The hairs 

 around the hole have been clipped short. 

 The white incrustation is due to a discharge 

 from the hole, which has hardened. Magni- 

 fied 12 times. (From Carpenter, Hewitt, 

 and Reddin, Journ. Dept. Agric, Ireland, 

 XV., 1914.) 



bending their bodies. Mr. R. G. Whelan, A.R.C.Sc.I., 

 Superintendent of the Ballyhaise Agricultural 

 Station, kindly helped in the observations and con- 

 firmed them. Six hours after being placed on the 

 calf, the maggots disappeared completely. Next 

 morning the spots where they had entered were 



