Vol. XI] 



COLE AND LOVETT—LIST OF OREGON DIPT ERA 



297 



613. Myopa vicaria Walk. 

 Hood River, V-19 (Cole). 



614. Myopa willistoni Banks 

 Corvallis, V-20. New name for pictipennis Will. 



Family CESTRID^ 



Fig. 31. Gastrophilus nasalis Linn<eus. 



Bot-flies are medium sized to quite large and have aborted 

 mouth parts. Some are hairy and bee-like in appearance and 

 others blue-black with spots of white bloom. Certain species 

 are well known to all farmers and stockmen. The larva 

 live under the skin of animals, in the nasal passages, and in 

 the stomach. The bot-flies are thus an important family 

 economically. 



615. Gastrophilus haemorrhoidalis (Linn.) 

 Occurs generally over North America, as do the other 

 horse bots. 



616. Gastrophilus intestinalis DeGeer 

 Commonly known as the "horse-bot." 



617. Gastrophilus nasalis (Linn.) 

 Known as the "nose-fly". 



618. GSstrus ovis Linn. 

 The sheep bot. 



619. Hypoderma lineata (DeVill.) 

 The ox-bot. The only specimen with data was taken at 

 Burns, V-19 (B. G. Thompson). 



