ANOPLURORUM BRITANNIA. 103 



with an interrupted transverse impressed line, two dark 

 chestnut, semicircular, transverse fasciae before the antennae, 

 united with two bands passing to the occiput ; trabeculae 

 and antennae short, the second joint the longest ; prothorax 

 sub-conical ; metathorax transverse, slightly channelled, with 

 a deep chestnut spot on each lateral margin ; base semi- 

 circular, ciliated with strong white hairs ; abdomen obtusely 

 ovate, white, the first and last segments, together with the 

 lateral transverse fasciae, deep ferruginous, the latter con- 

 fluent and abruptly truncate, with a dark chestnut spot on 

 the lateral margin ; legs tawny yellow. Length i. 



A common parasite on Ducks. I have found it on the 

 Mallard (Anas Boschas), Wigeon (Mareca penelope), Scaup 

 Pochard (Fuligula Marila), common Pochard (Fuligula 

 ferina), Shoveller (Anas clypeata) ; the Rev. L. Jenyns sent 

 it me from the Goosander (Meigus merganser), White- 

 fronted Goose (Anas albifrons), upon the Scaup and Sho- 

 veller ; it has also been found by Mr. Heysham at Carlisle ; 

 Mr. Thompson has sent it from Belfast, where he found it 

 upon the Teal (Anas crecca) ; Dr. Burmeister states that it is 

 also found upon the Smew (Mergus albellus). 



49. DOCOPHORUS THALASSIDROTOE. Denny. (Louse of 

 the Stormy Petrel.) 



Plate II. Fig. 6. 



Head and thorax tawny yellow ; abdominal fasciae deep 

 pitchy black, with two large foveola. 



Elongate, smooth and shining ; head sub-triangular ; cly- 

 peus narrow and produced, with an oblong depression, two 

 deep liver-coloured transverse fasciae before the antennae, 

 uniting in the centre, from which pass two perpendicular 

 impressed lines to the occiput, (which are sometimes rather 



