ANOPLURORUM BRITANNIA. 227 



white ; head semilunar, with short oblique chestnut bands 

 on the lateral margin ; prothorax obconical, with a trans- 

 verse line in front. 



Head produced in front, somewhat semilunar, posterior 

 angles acute, base concave, two short oblique chestnut fasciae 

 on each side, and an impressed line to the occiput ; eyes 

 obscure ; prothorax obconical, base truncate, the anterior 

 part with a transverse line ; metathorax transverse, sub- 

 conical ; abdomen ovate, paler than the head and thorax, 

 pubescent, the hairs of variable lengths, black and white ; 

 legs pale fulvous; femora short and thick. Length . 



This species I received from my brother, who took it on 

 the Turnstone ( Strepsilaris collaris), in Norfolk. 



15. MENOPON RIDIBUNDUS. Denny. (Louse of the 

 Black-headed Gull.) 



Plate XX. Fig. 3. 



Pitchy, shining and pubescent; head semilunar, deep 

 chestnut, with a black patch on each side, sutural margins 

 paler ; legs thick. 



Head semilunar, deep chestnut, with an angular black 

 spot on each side before the eyes ; occiput concave, with 

 several hairs on the margin ; prothorax sub-triangular, base 

 rotundate, a transverse impressed line in front, united to a 

 semicircular one on the basal margin ; metathorax not so 

 wide as the head, transverse ; abdomen oval, pitchy-black, 

 sutural margin of each segment paler ; legs deep chestnut ; 

 femora thick, the anterior pair rotundate on the superior 

 margin. Length . 



1 have seen only one specimen of this species, which I 

 found on the Black-headed Gull (Larus ridibundus). 



Q 2 



