270 



ORDER DIPTERA 



They cause a good deal of annoyance. One is called the chin 

 fly (Gastrophilus nasalis), whicli lays eggs on the jaws. 

 Another, the red-tailed botfly (Gastrophilus Jiceniorrhoidalis), 

 also deposits eggs in the vicinity of the mouth. 



Bot Fly of the Ox ( Ilypoderma lineaia).- — The hot fly of the 

 ox illustrates another method of development, but seems 

 to have been derived from that of the one occurring on the 

 horse. It is known in some parts of the country as the 

 Texas heel fly. It occasions a great deal of loss to the cattle 



Fig. 214.— Hypodc 



1 lincala: female — natural size 

 line. (From Insect Life.) 



I ted by side 



industry. The lar\;e perforate the hides. They develop 

 luidcr the skin and on maturing pass through the skin, 

 leaving a lot of openings. Such hides are docked one-third 

 in the market. Eggs are laid on the hairs of the legs, and as 

 he found none on the hairs of the back, Dr. Curtice concluded 

 that the larvae were taken into the mouth and travel by way 

 of the esophagus and through the tissues of the thoracic 

 region up through the tissues of the back as their normal 

 route. The puncture is made after the larva is under the 



