ANOPLURORUM BRITANNIA 1 13 



margin, with small fuscous spot before the antennae, and an 

 impressed line passing to the occiput ; vertex concave ; an- 

 tennae short and cylindrical, the second joint the longest; 

 trabeculae very small ; prothorax transverse ; metathorax 

 about the width of the head, sub-conical, base angular, and 

 produced in the centre ; abdomen sub-ovate, thickly pilose, 

 hairs long and yellow, the first and last two segments deep 

 chestnut, the intermediate six with a broad transverse fascia 

 on each side, dorsal space and suture pale yellow white; 

 legs thick, pale fulvous ; anterior femora sub-triangular. 

 Length f . 



Common upon the Red Grouse (Tetrao Scoticus), and 

 Black Grouse (Tetrao Tetrix), and I suspect also upon the 

 Ptarmigan (Tetrao lagopus). From the first species I have 

 received specimens from P. J. Selby, Esq. of Twizell, and 

 William Thompson, Esq. of Belfast. In some specimens 

 the lateral margin of the abdomen is pale. 



2. NIRMUS DISCOCEPHALUS. (Louse of the Cinereous 

 Eagle.) 



Plate IX. Fig. 10. 



Bright fulvous ; head nearly orbicular, with a chestnut 

 lateral spot before the antennae, and transverse bands on 

 the abdomen. 



Nirraus discocephalus. Nitzsch. Germ. Mag. iii.p. 291. Stepli. Cat pt. ii. 

 p. 331. Bunneister Handbuch ii. pt. ii. p. 430. sp. 21. 



Head large, nearly orbicular, with a narrow chestnut 

 band, anteriorly terminating in a large spot on each side 

 before the antennae, vertex, concave, base sub-truncate ; 

 eyes small ; antennae very short and cylindrical, the second 

 joint the longest ; trabeculae short and thick ; prothorax 

 small, transverse ; metathorax transverse, posterior margin 



i 



