ANOPLURORUM BRITANNIJE. 241 



head with four black spots, and two on the anterior part of the meso- 

 thorax ; femora with a fuscous line." (Burmeister.) Hab. Ardra 

 Stellaris. 



One specimen in the collection of the late Professor Nitzsch in the Univer- 

 sity of Halle. 



SUB-GENUS VII. PHYSOSTOMUM. (Nitzsch.) 



Burmeister, Stephens, Children. 

 SUB-GENERIC CHARACTER. 



Head oblong, temporal lobes small, not prominent, angu- 

 lated behind; antenna concealed, if any?; labrum horny, 

 excavated below ; throat prominent ; mesothorax none ; 

 metathorax continuous, with the abdomen, and marginate; 

 abdomen oblong, of nine segments? 

 All the species in this sub-genus are large, and I do not 

 think well defined, from the fact, that although I possess 

 specimens from six species of birds, only two of that num- 

 ber I dare venture to give as species, and of one of these I 

 have doubts, whether my synonym is correct. 



1. PHYSOSTOMUM MYSTAX. (Louse of the Fieldfare and 



Ring Ousel ) 

 Plate XXIII. Fig. 6. 



Pale testaceous; head and thorax the darkest, very smooth 

 and shining; lateral margin of the metathorax and abdomen 

 pitchy, occipital processes short, rather acute. 



Physostumum mystax? Burmeister Handbuch ii. pt. ii. p. 442. 



Head oblong, conical; clypeus narrow and rotundate, 

 with a slight tubercle on each side, vertex concave ; occiput 

 with an angular process in the centre, and two depressed 

 lines passing to the lateral margin, temporal processes some- 

 what acute and prominent ; eyes semilunar, passing below 



