66 



POULTRY DISEASES 



trated in Pig. 20 and, as may be seen, is smaller than the M. biseri- 

 atum. 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. 



Goniocotes gigas. — This is the largest species of the genus Goni- 

 ocotes, and is recognizable by its large size and full-rounded head. In 

 color it is a light yellow with bands and outlines along the outer 

 border of the abdomen. The female rea .hes the length of 4 mm. 

 and the male 3 mm. This species has been found rather common in 

 North Carolina, but not apparently so in the West and Middle West. 

 It is also reported as common in Australia and reported Irom Eng- 

 land. It infests chickens. 



Goniodes cHssimillia. — This is a rather large louse and is appar- 



-;B 



--C 



Fig. 19. Menopon Bi- 

 seriatum. 



A, head provided 

 with mouth parts for 

 biting, feelers (anten- 

 nae) and eyes; H, legs 

 attached to the thorax; 

 C, abdomen. 



Fig. 20. Menopon Pal- 

 lidum. 



A, head; B, thorax; 

 l)rovided with three 

 pairs of legs; C, abdo- 

 men with hairs. 



ently rare. The head is subquadrate, the thorax short and narrow 

 and the abdomen large and globular. 



Goniocotes hologaster. — The head is nearly quadrate, the thorax 

 narrow and the abdomen short and globular. Fig. 21 illustrates this 

 species. 



Lipeurus infuscatiis. — This is another louse that may infest chick- 

 ens. It has been studied in the author's laboratory and has also 

 been reported by Osborn as occurring in Iowa. However, it is not 

 very common. Fig. 22 illustrates this louse. This louse is long and 

 slender. The front part of the head is rounded, the thorax a trifle 

 narrower than the head and the abdomen is long and thin. 



LICE OF TURKEYS 



Goniodes stylifer. — This is the common turkey louse. Its head 

 is well rounded in front, rather square cut, with scallops behind: 

 the thorax is narrow and the abdomen large and globular. Fig. 23 

 illustrates this louse. 



