Lice Infesting Birds. 97 



abdomen round almost as broad as long, with eight wrinkled 

 rings ; hairy ; head thorax and legs chestnut, abdomen dull white, 

 lyength 1.3 mm. 



LICE OF GUINEA-PIG. 



Gyropus Gracilis, (gyrus circle). Thin G. As one of the 

 bird lice (non-suckers) this is remarkable for the narrowness of 

 both head and body ; the head and thorax are about y^th of the 

 entire length, the abdomen about ^^th. Length 1.2 mm. Anten- 

 nae and legs short ; color white or yellowish. 



G. Ovalis. Oval G. This is distinguished by its broader 

 head, and its broad oval abdomen with two rows of hairs on each 

 ring. Body white, with dark spots : tarsi and claws black. 

 Length 1.2 mm. 



Menopon Extraneum. Foreign M. Head large, temples 

 round, with three long and three short hairs ; thorax longer than 

 the head with three sternal spots ; abdomen oval, hairy. Head 

 and spots yellow, thorax yellowish white, bands black. Length 

 1.7 to 2 mm. 



LICE INFESTING BIRDS. 



The lice infesting birds are so numerous that a full description 

 of each may be omitted. In place of this we append the charac- 

 ters of the different genera, and the student will find the species 

 and their various hosts named in the general list. 



Genus Ornithobius. Body long, narrow, sides almost paral- 

 lel ; antennae in 5 segments, the two first being the longest in the 

 males, a temporal band forms a fold behind the eyes : last abdo- 

 minal segment is pointed in the male. The one species, O. Bu- 

 cephalus of the Swan is 3.5 mm. long. 



Genus Lipiurus. Body long, narrow, sides almost parallel, 

 antennae in 5 segments, the third bearing an appendix in the 

 male, last abdominal segment in male notched. Eight species are 

 described as infesting the pigeon (i), chicken (2), pheasant (i), 

 turkey (i). Guinea-fowl (i), duck (i) and goose (2). 



Genus Goniodes (gonios corner). Body flat, broad, abdomen 



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