144 THE AMEBIC AX NATURALIST [Vol. XLVII 



mon to both hosts. The flamingoes, constituting the 

 order Phcenicopteriforrnes, are parasitized by four spe- 

 cies of Mallophaga of four different genera. 



The Anseriformes, swans, geese and ducks, are repre- 

 sented in the host-list by sixty-four species, seven being 

 swans, nine geese and the rest ducks. The swans have 

 a Mallophagan genus, Ornithobius, peculiar to them, 

 which occurs on four out of the seven species. The spe- 

 cies bucephalus of this genus occurs on two old world 

 and one new world species. Six of the seven swan kinds 

 belong to the genus Cygnus. Three of these are old 

 world, two new world and one circum-polar in range. 

 Trinoton conspurcatum has been recorded from the three 

 old world and the single circumpolar species, and Doco- 

 phorus cygni from two old world and one new world spe- 

 cies. Cygnus cygnus of Europe has six Mallophagan spe- 

 cies. The curious Australian swan Chenopsis atrata has 

 two parasite species neither of which occurs on any other 

 swan. Among the geese are three species of Anser, two 

 of them old world and one new world, with the parasite 

 Lipeurus jejunus common to them all, and four species 

 of Branta, one of which also carries Lipeurus jejunus. 

 This Mallophagan species also occurs on the domestic 

 goose. The forty-four species of ducks of the list are 

 parasitized by forty-two species of Mallophaga. Of these, 

 Docophorus icterodes is recorded from eleven duck spe- 

 cies, Lipeurus squalidus from fifteen and Trinoton luri- 

 dum from nineteen, these duck kinds including African, 

 Asiatic, European, North American, South American and 

 cosmopolitan species. A duck kind from Australia and 

 Malaysia has four parasitic species, all peculiar to it. 

 Three species of ducks have the three most familiar duck- 

 infesting Mallophaga, mentioned above, common to them 

 all. Anas boschas, the ancestor of the domestic duck, has 

 these three and just one more. But so far only one of 

 the three has been recorded from the domestic duck. 

 While many species of ducks, and most individuals of the 

 species, are parasitisized, it is rare that more than two 



