ORDER ACARINA 



29 



The attacks on the birds are made probably for the 

 most part at night, but the mites are usually well filled 

 with blood, which gives them their red color. 



The use of perclies that are solid, smooth, and free from 

 cracks, and the frequent dipping of these in liot water, and- 

 the thorough cleansing of the entire cage, using boiling water 

 if there are inaccessible cracks, will serve to destroy the 

 pests. 



Fig. 7. — Poultry tick (Derrnanyssus gallinw): a, adult; h, tarsus; c, 

 mouth parts; d and e, young — all enlarged. (After Osborn, Bur. Ent., U. 

 S. Dept. Ag.) 



The Poultry Tick {Derrnanyssus g all iiicp).— One of the 

 most ])crsistent and injurious of the pests of the hennery 

 is the little chicken mite, which gathers on the fowls, espe- 

 cially at night, and sucks their blood. It is a well-known 

 form, and has been described for many years, though in 

 many works it is confused with the preceding species or 

 considered simply a variety of that form. Its distribution 

 seems to extend pretty generally over the world where 

 domestic fowls are kept. 



