376 ANOPLURA. 



CASE mandibles, and are principally, although not entirely, confined to 

 birds. The other (Hsematopina) subsists on the blood of the 

 animals they infest, for which purpose they have the usual sucking 

 apparatus of the Hemiptera. These are restricted to mammals. 



We left off the parasitic mites at the feather-eating species, and 

 v/e naturally commence the lice with the species having similar 

 habits. 



For the most part these insects have two simple eyes, but some- 

 times, as in Gyropus, they are without any. The antennae vary 

 even in the same genus, but the tarsi and claws are constant, and 

 furnish the best characters for dividing the family into groups. 

 We have accordingly given figures of the different variations in 

 these. 



Family MALLOPHAGA (Feather and Hair Eaters). 

 The name of this section was given to it by Nitzsch with 

 reference to their food, and is derived from the Greek word uaXXos, 

 a fleece, and (f)ay(o, I eat. It has been subdivided into several 

 genera depending upon the form of the antennae, and the number 

 of joints composing them, &c. 



Sub-family Liotheid^ (Burm). 

 Antennae four-jointed, mouth with strong mandibles. This sub- 

 family is divided into two sections ; the one with one claw to the 

 tarsi (genus Gyropus— the louse of the guinea pig), and the other 

 with two claws, containing among others the following, viz. : — 



Genus Menopon {Nitzsch). 

 Head semilunar or trapezoidal. No deep sinuosity on the 



Nos. 



lateral margin. 



^.lENOPON PALLIDUM {Nitzsch).—\, Specimen ot ditto ; 2. Enlarged fi-ure ot 

 ditto ; 3. Illustrative vignette (cocks and hens). 



Domestic poultry seem to have more than their fair share of 



