82 MONOGRAPH I A 



wide at the base ; abdomen broad, pitchy, with a humeral 

 spot, and the last two segments ferruginous. 



Head and thorax bright chestnut, the former very large 

 and triangular, anteriorly much contracted and produced, 

 with a semicircular black line on each side, from the trabe- 

 culae towards the centre, base very broad, convex and 

 rotundate, with two curved depressed lines arising from the 

 occiput ; trabeculae acute ; antennae fulvous, rather short ; 

 eyes flat ; prothorax very small, but one-third the width of 

 the head, transverse, lateral margin rotundate, centre 

 channelled ; metathorax small, acutely angular behind, with 

 a depressed line in the centre, and one on each side ; abdo- 

 men broad, obtusely oval, depressed in the centre, pitch 

 colour, the last two segments, and a patch on the shoulders, 

 ferruginous, the first seven segments, with a double row of 

 fovea on each side, sutures setigerous ; legs ferruginous 

 and thick ; anterior femora sub-angular. Length f . 



I have found this species upon the Arctic and Pomarine 

 Skuas Lestris parasiticus and Pomarinus. W. M. Tweedy, 

 Esq. of Truro, and Rev. L. Jenyns have sent it from 

 the Common Sandpiper, Tringa Hypoleucos, and the latter 

 gentleman has also found it upon the Ringed Plover (Cha- 

 radrius Hiaticula). 



23. DOCOPHORUS PALLESCENS. Denny. (Louse of the 

 Titmouse.) 



Plate I. Fig. 8. 



Pale ochraceous yellow ; head large, produced in front ; 

 abdomen nearly orbicular, very hairy, segments sinuated 

 posteriorly. 



Head large, anterior part narrow, sinuated before the 

 eyes, front deeply emarginate, with an oblong depression, 

 base very broad, quadrate, rotundate ; eyes small, promi- 



