FEATHERLICE 1 53 



addition, species of another rather large genus {Omithobius). It is 

 interesting that this louse, as well as the one found on the wings, is pale 

 in colour, as if to match the white plumage of its hosts. The head 

 species has retained the usual brown colour characteristic of the 

 members of the genus {Anatoecus) which parasitises all the Anseriformes. 



Pelecaniformes 



Genera of Mallophaga recorded in Britain : Eidmanniella (Ambly- 



cera); Pectinopygus (Ischnocera). 



The cormorant, the shag and the gannet each have species of only- 

 two genera, one belonging to the superfamily Amblycera and one to the 

 Ischnocera (Plate XXIIb). It is interesting that there is no louse 

 adapted to the head niche, and it may be that the short feathers of the 

 head do not provide sufficient covering for the lice of birds which 

 spend some time under water. The grebes and divers also have no 

 head lice. 



Procellariiformes 

 Genera of Mallophaga recorded in Britain : Austromenopon, 

 Ancistrona (Amblycera) ; Halipeurus, PerineuSj Trabeculus, Saemunds- 



sonia (Ischnocera). 



Mallophaga have been recorded from three of the resident British 

 petrels — the storm-petrel, the manx shearwater (Plate XXIIIc) and the 

 fulmar. The manx shearwater has five species of Mallophaga, one of 

 which belongs to a genus of large species {Ancistrona). Species of this 

 Amblyceran genus on related shearwaters {Puffinus) have been found 

 with eggs and adults of a parasitic mite attached to their abdomens. 

 The only other record of this mite {Myialgopsis trinotoni) is from the genus 

 ( Trinoton) found on ducks, geese and swans — the species of which are 

 also among the largest of the Mallophaga. 



PODICIPITIFORMES AND COLYMBIFORMES 



Genera of Mallophaga recorded from the grebes in Britain : 

 Pseudomenopon (Amblycera); Aquanirmus (Ischnocera). Genus 

 recorded from the divers in Britain : Craspedonirmus (Ischnocera). 



The British grebes and divers each have one characteristic genus of 

 Ischnocera. These genera do not appear to be related to each other nor 



