ANOPLURORUM BRITANNIA. 137 



pitchy-brown, base rotundate; metathorax quadrangular, 

 with a subtriangular pitchy spot on each side; abdomen 

 oblong ovate, the last segment chestnut, the first six seg- 

 ments with a pitchy-brown lateral band ; legs thick, pale 

 yellow ; tarsi chestnut. Length | . 



Found on the Eared Grebe ( Podiceps auritus), and com- 

 municated by Mr. Thompson from Belfast. 



35. NIRMUS RALLINUS. Denny. (Louse of the 

 Water Rail.) 



Plate VIII. Fig. 7. 



Pale yellow- white, shining, smooth, and depressed; head, 

 thorax, and lateral margin of the abdomen pale fulvous, 

 the former elongate ; metathorax with the anterior angles 

 protuberant. 



Head elongate, conical, with a pale chestnut, lateral band 

 anteriorly, and an angular spot before the eyes ; vertex with 

 a somewhat oval depression, occiput truncate ; eyes small, 

 nearly obscure ; antennae pale fulvous, thick, filiform, the 

 first two joints the largest ; trabeculae small and acute ; 

 prothorax quadrangular, depressed in the centre ; meta- 

 thorax sub-quadrate, rather widest at the posterior margin, 

 with a slight protuberance on each side anteriorly; abdo- 

 men elongate and acute, lateral margin pale fulvous; legs 

 rather thick, femora enlarged. Length $ \ $ 1. 



I obtained this species from the Water Rail (Rallus 

 aquaticus) . 



36. NIRMUS ALCJE. Denny. (Louse of the Razor-Bill.) 



Plate IX. Fig. 1. 



Head and thorax bright fulvous yellow, and shining, the 

 former oblong, with a sinuated band on each side of deep 



