104 MONOGRAFH1A 



darker), base large and rotund ; occiput sub-truncate ; tra- 

 beculse acute ; antennae pale yellow ; prothorax small, trans- 

 verse, channelled in the centre ; metathorax as wide as the 

 head, lateral margin rotundate, posterior semicircular, deeply 

 channelled, shaded on the sides with chestnut ; abdomen 

 elongate ovate, pale tawny white, the sutures deeply im- 

 pressed, posteriorly sinuated, lateral transverse fasciae pitchy 

 black, with two large foveolae ; legs thick, pitchy brown. 

 Length j. 



Communicated by W. M. Tweedy, Esq. of Truro, from 

 the Stormy Petrel (Thalassidroma pelagica), to whom I am 

 indebted for much valuable assistance. 



50. DOCOPHORUS PASSERINUS.- Denny. (Louse of the 

 Wag-tail.) 



Plate V. Fig. 12. 



Head and thorax chestnut, yellow, the former small, sub- 

 pyriform ; abdomen acuminate ; lateral fasciae deep chestnut. 



Head sub-pyriform ; clypeus slightly emarginate, with an 

 acuminate depression, two deep liver-coloured bands from 

 the antennae to the occiput, contracted in the centre ; tra- 

 beculae strong and curved ; antennae short ; prothorax small, 

 transverse, chestnut ; metathorax small, margins deep chest- 

 nut, base semicircular, ciliated with stiff white hairs ; abdo- 

 men acuminate, dull yellow white, the lateral transverse 

 fasciae and last two segments deep chestnut ; legs thick and 

 strong, tawny yellow ; anterior femora angulate. Length . 



Communicated by the Rev. L. Jenyns from the Pied 

 Wagtail (Motacilla alba), by Mr. G. R. Denny from the 

 Yellow Wagtail (Motacilla flava) ; I once took a specimen 

 from the Sedge Warbler (Sylvia Phragmitis). 



