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SUBORDER MALLOPHAGA. 213 
LOUSE OF THE GUINEA HEN. ; 
(Menopon numide G.) 
Giebel seems to have been the first to have mentioned this species, 
and we may infer that it is usually not abundant. Piaget speaks of it 
as Similar to the Menopon phastomum N. 
We have not had opportunity to make careful search for it, but it 
doubtless occurs on guinea fowls in this country. It would probably 
be difficult for an ordinary observer to distinguish between this and the 
common species infesting hens, and even if noticed in abundance on 
guinea fowls it would very likely escape mention. 
LOUSE OF DUCKS. 
( Trinoton luridum Nitzsch.) 
Redi seems to have been the first to give mention of this very com- 
mon species, it being figured in the Exper., Pl. XII, as the louse of the 
teal. Itis also figured by Albin (pl. 46) under the 
Same common name as quoted by Denny. Nitzsch 
described it in 1818 under the name given above, and 
the species has been fortunate enough not to have 
received any other designation since, although it has 
been mentioned in most of the works referring to the | 
parasites of domestic fowls or the parasites of birds. 
It is a very common species and occurs on a great 
many different species of ducks, so that it is unnec- 
essary to try to enumerate the hosts. So far as we 
have seen or can learn from record, however, it is not 
known to occur on birds outside of the duck family 
(Anatide). ' 
Its nearest ally is the goose louse, to be mentioned 
next, and it is easily distinguished from that by the 
difference in size and the more distinct markings in 
this species. The markings are shown in the accom- — F'6-137.—Trinotonturi- 
panying figure, their distribution on the head, thorax, _ paaniehe 
and abdomen being clearly indicated. The abdomen 
in the specimen figure is a trifle narrower and the sides a little more 
parallel than in some specimens observed. It is 4 to 5 mm. in length. 
LOUSE OF THE GOOSE AND SWAN. | 
( Trinoton conspurcatum Nitzsch.) 
This species was evidently recognized at an early date, and is said 
to be mentioned by Sulzer under the name of Pediculus anseris. Nitzseh 
