POULTRY DISJ2ASLS AND THElIR TR]iATME;N'r. 1 39 



Fig. 32. Photograph of the six-legged larva of Kneinidocoptes 

 {Dcrinatoryctcs) fuutans. (After Haiduk). 



The mites bore under the scales of the foot and leg and bur- 

 row deeper and deeper into the tissue. They set up an irritation 

 which leads to multiplication of cells and the exudation of serum. 

 This accumulation forms crusty deposits beneath the scales. 

 These crusts contain many depressions in which are imbedded 

 female mites containing eggs. The larvje and the males are 

 usually found beneath the crusts. The relations just described 

 are shown in fig. 33, which is a picture of a section of the skin 

 of a ''scaly" leg. 



