84 INSECT PARASITES. 



Fumigating the bird's is sometimes resorted to, hut 

 it is trouhlesome and not always successful. An 

 engine named Lagrange's Exterminator has been 

 used for some time with more or less success. This 

 is simply a wooden box, in which the fowl is placed 

 in such a position that its head is out in the air and 

 its legs firmly tied down. The box being made air- 

 tight, and the extruded head being tied around with 

 a piece of thick cloth close to the opening in the box, 

 no vapour inside can escape. In this box a small 

 piece of brimstone can be burnt, the vapour soon 

 killing all the body lice. 



C. Other Insect Parasites. 



There are two Diptera or true Flies found some- 

 times infesting the Fowl and other poultry. These 

 pests are related, although distantly, to the Fleas, very 

 closely to the Sheep-Tick, which, as I have pointed 

 out, is also one of the true two-winged insects, only, 

 like the Flea, it is minus its wings. 



Diptera on Fowls. 



These bird parasites are known as OrnitJiobia 

 pallida, Mg., and Ornithomyia avicularia, L. (figs. 10 

 and 11). Both belong to the family Ilippoboscida;, 

 in which all the species pass their egg and larval 

 state in the body of the mother, instead of leading a 

 free larval life. These strange insects are born in 

 fact as pupae, or anyhow adult larvae ready to pupate. 

 Only a single egg is produced by each female, and 



