122 FEATHER-LICE OF DUCKS, ETC. 



They occur upon many vSpecies 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-loixse 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). 



Docopliorus cygni Denn3^ 



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. 



LipexiTus tadoriKje 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 abdonaen possess black spots along the margins. 



Lipeurus S(/ualidus Nitzsch. 



Most species of wild ducks, as well as the domesticated 

 ones, are infested with this parasite. It is a large insect 

 measuring about 4-mm. in length. Its elongate form is of a 

 light-yellowish color with a darker border of the thorax and. 



