36 



POULTRY DISEASES 



short and globular. They are provided with 

 three pair of legs which are attached to the 

 thorax. The free extremity of the legs is pro- 

 vided with two hooklets or claws which enable 

 them to hold on to their host. The body and legs 

 may be covered with a greater or less quantity of 

 hair or bristles. 



The lice of birds are placed under the follow- 

 ing genera: Menopon, Goniodes, Groniocotes, 

 Lipeurus, Docophorus and Nirmus. 



Fig- 2 Fig. 3 



Fig. 2. Menopon Biseriatum 



A, Head provided with mouth parts for biting, feelers 



(antenna:) and eyes. B, legs attached to the 



thorax. C, abdomen. 



Fig. 3. Menopon Pallidum 



A, Head. B, thorax provided with three pairs of 



legs. C, abdomen with hairs. 



Lice of Chickens 



Menopon biseriatum (the large chicken louse). — This is 

 the largest louse found upon chickens. It is about one-twelfth 

 of an inch in length. It is light in color. Fig. 2 illustrates 

 this louse much enlarged; the short mark at the right shows 

 the actual length of this louse. This parasite is common on 

 the heads of young chickens. 



Menopon pallidum (the small chicken louse). — This louse 

 is illustrated in Fig. 3 and, as may be seen, is smaller than 

 the M. biseriatum. In some parts of the country this louse 

 is the more common of the two and is a source of considerable 

 trouble. It may spread from chickens to other animals and 

 birds. 



