AiNOPLURORUM BRITANNIA. 71 



in the centre ; metathorax the width of the head, acutely 

 angular behind, posterior margin deep liver brown, ciliated 

 with stiff hairs ; abdomen short, ovate, yellow white, with 

 numerous white hairs, the first seven segments with the 

 lateral patches shading from liver brown to chestnut, the 

 first three broad, the four following long, narrow, uniting 

 in the centre, the eighth chestnut, the last white, the 

 under side with a large brown spot near the anus ; legs 

 pale, variable, the anterior short ; femora somewhat securi- 

 form, the posterior very large and thick ; the femora acutely 

 angulated or toothed beneath ; tibiae much flattened and 

 armed at the extremity with two prominent spines ; ungues 

 when closed upon the apex of the tibiae scarcely visible. 

 Length . 



Parasitical upon several of the Insessorial Birds. The Rev. 

 L. Jenyns found it upon the common Bunting ; Mr. Double- 

 day upon the Crossbill ; my brother sent me specimens 

 from the Bullfinch and Nuthatch, and I have found it 

 myself upon the Green Grosbeak, Yellow Bunting, Spar- 

 row, and Lesser Whitethroat. 



9. DOCOPHORUS VARIABILIS. Denny. (Louse of the 

 Dunlin.) 



Plate III. Fig. 4. 



Head and thorax bright chestnut, the former elongate, 

 triangular ; abdomen ovate, milky white, with deep liver- 

 coloured fasciae. 



Head bright chestnut, elongate, triangular, anterior 

 part much contracted, with a somewhat obtuse depres- 

 sion, and deeply sinuated before the antennae, from which 

 proceed a transverse and two diagonal impressed lines 

 extending to the occiput, base broad and sub-trun- 



