ANOPLURORUM BRITANNIJE. 181 



linidae at first view, more especially after death, when the 

 extremity of the abdomen frequently curves upward, as is 

 the case in Oxytelus, Stenus, &c. The female is much 

 scarcer than the male, I have seen only one of the former 

 sex, though numbers of the latter. 



17. LIPEURUS BREVICORNIS. Denny. (Louse of the Shag.) 

 Plate XII I. Fig. 8. 



Chestnut, smooth, and shining ; head obtusely triangu- 

 lar ; antennae in the male short and thick ; abdomen ovate, 

 the sutures pale. 



Head obtusely triangular ; clypeus concave, slightly pro- 

 duced, a black spot on each side before the eyes, base 

 transverse and convex ; eyes small and flat ; antenna3 pale, 

 fulvous, and setaceous, in the male short and thick, the 

 first joint large, somewhat curved, second short and cylin- 

 drical, third conical, obtuse, and slightly recurved, fourth 

 and fifth very minute, the female with first two the largest; 

 prothorax transverse channelled ; metathorax subquadrate, 

 with a small fasciculus of hairs from each lateral angle at 

 the base ; abdomen oblong ovate, the first segment short 

 and rotundate, in the female, rather longer, and somewhat 

 angular in the male, light chestnut down the centre, lateral 

 margins dark ; stigmatic foveolae deep ; sutures pale ; legs 

 fulvous ; anterior femora subangular. Length *. 



I have received this species from the crested Shag (Pha- 

 lacrocorax cristatus), taken at Twizell by Mr. Selby, and 

 Belfast by Mr. Thompson. The latter gentleman also 

 found one specimen upon the Oystercatcher (Haematopus 

 Ostralegus). 



