ANOPLURORUM BRITANNIA. 153 



tawny, conical, posterior margin circular ; metathorax much 

 wider, transverse, lateral margins rounded, and posterior 

 obtusely angular in the centre ; abdomen pale ashy-white, 

 obtusely ovate and depressed, a broad ferruginous marginal 

 band, extending on each side from the anus to the protho- 

 rax, the sutures deep chestnut on the lateral margin ; legs 

 pale tawny-yellow, anterior femora large ; tibiae long, with 

 several strong spines towards the base. Length 1 to 1|. 



A common parasite on all varieties of domestic Pigeons, 

 the Rev. L Jenyns has sent it to me from the Stock Dove 

 (Columbus CEnas) and Ring Dove (C. Palumbus). Mr. 

 Tweedy sent me some specimens from the Turtle Dove (C. 

 Turtur), and 1 have also found the same on the last bird 

 myself, which I am disposed to consider as a variety of the 

 G. Compar. It resembles the latter in every respect, 

 except in being uniformly smaller. It is not the immature 

 insect, because young specimens of Compar of the same 

 dimensions are not so perfect in symmetry, and much paler 

 in colour. Although I here give it as a variety, I am by no 

 means satisfied, but considered it better to do thus for the 

 present than be accused of unnecessarily increasing the 

 number of species. I may remark in favour of its specific 

 identity, that although I have found it upon the other 

 kinds of Pigeons, I never found the true Compar upon 

 the Turtle Dove. 



2. GONIOCOTES HOLOGASTER. (Louse of the Domestic 

 Fowl.) 



Plate XIII. Fig. 4. 



Head, thorax, and legs pale-yellow, with pitchy black 

 marginal bands and spots ; abdomen with pale ash-coloured 

 lateral fasciae, bordered with black. 



