ANOPLURORUM BRITANNIA. 149 



sub-emarginate, stigmatic areolas pale, lateral margin of 

 the abdomen black. 



Nirmus tenuis. Burmeister Handbuch ii. pt. ii. p. 429. spe. 14. 



Head oblong, sub-conical ; clypeus obtuse, with a bifur- 

 cate depression passing to the vertex, lateral margin si- 

 nuated before the eyes, with a quadrangular black spot at 

 the base of the antennae, and two diagonal lines from thence 

 to the occiput; eyes obscure; antennae slender, filiform, 

 pale chestnut, the second and third joints fuscous at the 

 base; prothorax light chestnut, transverse, channelled in 

 the centre ; metathorax trapezoidal, posterior margin acutely 

 angular, and much paler than the upper ; abdomen sub- 

 claviform, dull chestnut, stigrnatic spaces paler and bright, 

 lateral margin pitchy black ; legs fulvous ; anterior femora 

 enlarged and rotundate, with a pitchy spot at the apex. 

 Length I. 



Parasitical upon the Sand- Martin (Hirundo riparia). 



51. NIRMUS SCOLOPACIS. Denny. (Louse of the Snipe.) 



Plate XI. Fis:. 8. 



Bright chestnut, smooth, and shining ; clypeus broad, 

 truncate, lateral margin of the head with a deep sinus ; 

 abdominal segments, with an angular black spot on the 

 lateral margin. 



Head oblong, sub-cylindrical ; clypeus ochraceous, trun- 

 cate, lateral sinus large, pitchy black, vertex concave ; an- 

 tennae filiform, ferruginous yellow, the second joint the 

 longest, seated in the lateral sinus ; eyes small, fuscous ; 

 prothorax the width of the head, sub-quadrangular; meta- 

 thorax quadrate, lateral margin slightly concave, posterior 

 acutely produced in the centre, setose ; abdomen sub-clavi- 

 form chestnut, sutural margins and dorsal line pale, the first 



