136 



Tar (pine tar) is useful for painting surface wounds, 

 after the maggots have been removed ; it also prevents 

 the access of flies for further infection. 



Cotton soaked in any of the mixtures given above may 

 be used to plug deep wounds, or the mixtures may be 

 used for bathing shallow wounds, Great care shoud 

 be taken to remove all maggots and to maintain the 

 utmost cleanliness of the wounds, in order to promote rapid 

 healing, and to prevent blood poisoning. 



EOT FLIES. Diptera. 

 The bot flies of horses, cattle and sheep occasionally 



Fig. 145. Sheep bot fly. Fig. 146. Sheep bot. 



Enlarged. (Fiom U. S. Larvae of different ages. Naturol size. 

 Dept. Afjric.) (From U. S. Dept. Agric ) 



occur in small numbers in the West Indies. Since these are 

 important in other countries they are briefly considered here. 



The bot flies are related insects" 

 of the order Diptera. The sheep bot 

 (Oestrus ovis, L.) infests the nasal 

 cavities and head of the sheep (Fig. 

 145). The maggots (already hatched 

 from the egg) are deposited by the 

 female parent in the nostrils of 

 the sheep. (Fig. 146). The larvae 

 then make their way up the nasal 

 passages into the head, where they 

 grow and develop throughout the 

 larval period which occupies 8 to 

 10 months. At the end of this time, 

 the full-grown larvae are expelled 



Fig 147. Sheep bot. 



Pupa. Enlarged. (From 



U. S Dept. Agric.) 



