122 FEATHER-LICE OF DUCKS, ETC. 
They occur upon many species of aquatic birds like ducks 
and geese. This species is about 1mm. long. The head and 
thorax are of a bright red color with dark bands; the abdo- 

Fig. 98, — Biting-louse of ducks, etc. Greatly 
enlarged. Original. 
men is whitish in the center, and has broad and horny bands 
of a dark reddish color at the sides, which possess a still 
darker spot at the margin (fig. 98). 
Docophorus cygni Denny. 
This small parasite, only 1mm. long, and of a robust 
form, is found upon the swan. Its roundish head, the nar- 
row thorax, and the legs are bright reddish-brown; the ab- 
domen is white in the center, while the harder plates on the 
sides are brown. 
Lipeurus tadorne Denny. 
According to Prof. Comstock this feather-louse is found’ 
upon the goose; others have been found upon the sheldrake. 
This parasite is white, with a smooth and shining surface 
and of an elongated form; its heart-shaped head, the thorax, 
and the abdomen possess black spots along the margins. 
Lipeurus squalidus Nitzsch. 
Most species of wild ducks, as well as the domesticated’ 
ones, are infested with this parasite. It is a large insect. 
measuring about 4mm. in length. Its elongate form is of a 
light-yellowish color with a darker border of the thorax and. 
