EXTERNAL PARASITES 



37 



Goniodes dlssimillia. — This is a ratlier large louse and Is 

 apparently 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. 4 

 illustrates this species. 



Lipeurus infuscatus. — This is another louse that may infest 

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

 has also been reported by Osborn as occurring in Iowa. How- 

 ever, it is not very common. Fig. 5 illustrates this louse. 



Lipeurus infuscatus. — 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. 



Fig. 5- 



Fig. 4- Goniocotes Hologaster 



A, Mouth parts. B, antennae. C, booklets on free extremity of leg. 



Fig. 5. Lipeurus Infuscatus 



A, Mouth parts. B, abdomen. Drawing to right o'f head indicates actual 



size. 



Fig. 6. Goniodes Stylifer 



A, Mouth parts. B, antennae (feelers). C, legs. Drawing to right of 



head indicates actual size. 



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. 6 illustrates this louse. 



Lipeurus polytrapezius. — This is a long, slender louse, with 

 two or three bristles extending from each segment of the 

 abdomen. Its head is well rounded In front and the thorax 

 is rather broad and long. 



Lice of Ducks 



Menopon obscurum. — The head is crescent-shaped in front 

 and the abdomen has dark, lateral bands. It is dark fawn 

 colored. 



