86 PARASITES OF THE DOMESTIC ANIMALS 



segments. Entire insect long and narrow. General color grayish. 

 Female 4 mm. in length (Fig. 56). 



A common species. 



4. Trinotum lituratum {Trinoton lituratum). — Shorter and smaller 

 than the preceding species, with head, thorax, and abdomen relatively 

 broader. Legs broad and stout. Abdominal segments bordered by 

 darkened spots. Color white. 



This species occurs upon domestic geese. 



Lice of Swan 



Philopterus cygni and Ornithonomus cygni are species of Philopteridse 

 harbored by swan. 



1. Philopterus cygni {Docophorus cygni). — Head about as broad as 

 long, rounded in front. Thorax short and narrow. Abdomen sacular, 

 white in center, darkened at sides. Head, thorax, and legs reddish 

 brown. Female 1 mm. in length (Fig. 57). 



This is the "Little Red Swan Louse." It is quite common. 



2. Ornithonomus cygni (Ornithobius bucephalus; 0. cygni). — Head 

 massive and nearly as broad as long. Thorax about the same length as 

 head. Abdomen narrow oval, tapering toward apex; black points on 

 outer margins of four of the abdominal segments. The body is trans- 

 parent and much flattened. General color white. Female 4 mm. in 

 length (Figr 58). 



Occurs in great abundance on all species of swan. 



Lice op Pigeons 



The more common Philopteridse of pigeons are Goniocotes compar, 

 Goniodes damicornis, and Lipeurus columbw. 



1. Goniocotes compar. — Head large, nearly as broad as long, rounded 

 in front. Thorax narrow. Abdomen broad oval. Color dirty yellow. 

 Pemale about 1.3 mm. in length (Fig. 59). 



Found quite frequently. 



2. Goniodes damicornis. — Head about as broad as long, roimded in 

 front, angular behind. Legs stout. Abdomen broad and short. Color 

 brown. Female 2 mm. in length (Fig. 60). 



Not as common as preceding species. 



3. Lipeurus columbce (L. baculus). — Characterized by its extreme 

 slenderness. Head long and narrow, as is also the thorax and abdomen. 

 Upon the abdominal segments are brownish patches. Head and thorax 

 brownish red in color; abdomen dusky. The female is 2 mm. in length. 



Occurs abundantly. 



