Bui. 553, U. S. Dept. of Agriculture. 



Plate I. 



The Chicken Mite (Dermanyssus gallinae). 



Upper left, eggs; upper center, larva, dorsal view; upper right, first-stage nymph before feeding; 

 below, old roost showing spots of excrement. All much enlarged except the lower figure, which 

 is somewhat reduced. (Original.) 



