40 
On the latter this border is broken into a series of quadrate patches 
corresponding with the segments. The young lack the definite mark- 
ings of the adults, but have nearly the same general outline of body. 
The annexed figure will doubtless enable anyone to determine with 
certainty as to specimens taken from ducks. 
(Lipeurus anseris G-urlt.) 
Under this head is recognized a species which is said to differ from 
the anseris of Linnaeus and other authors, which is referred to jejunis 
of Mtzsch. It was described from specimens taken from the domestic 
goose, but would appear to be rather a rare species since it has not been 
generally recognized. We insert it upon the authority of Piaget, who 
seems to consider it as unquestionably distinct from related species, 
though apparently in doubt as to the real form from which the descrip- 
tions were made. 
THE LIPEURUS OF THE GOOSE. 
{Lipeurus jejunus Nitzsch.) 
It is generally accepted that Redi had this species in hand as one of 
the different parasites which he figured, and it has certainly been re- 
ferred to by Linnaeus, Albin, Olfers, and others, but the description by 
Nitzsch may be taken as the first strictly technical description that 
would separate it certainly from related forms. Denny records it as 
taken from the white-fronted goose, the Brent, the wild goose, and the 
bean goose, and Piaget adds the gray goose, Canada goose, domestic 
goose, and the cvgypticus. 
It is evident, therefore, that it is generally distributed upon members 
of the goose family. 
We have not had specimens in hand, but it is described as slender, 
pale yellow-white, with a pitchy margin, the first eight segments of the 
abdomen with quadrangular bands, and the legs dusky above. 
THE TURKEY LOUSE. 
(Lipeurus polytrapezius Mtzsch.) 
This, like the variabilis, appears to have been one of the earliest 
species to receive recognition, as Linnaeus cites Eedi (Exper., t. II; fig. 
2) with the name Pediculus accipitris, while he himself uses the name 
Pediculus meleagridis, and gives a brief description, which probably 
refers to this species. Authors have quite generally, however, followed 
the name given by Nitzsch, as above. It has, doubtless, been common 
wherever this fowl has been kept and is one of the familiar species. 
It is of rather large size, 3 to 3£ millimetres (an eighth of an inch) in 
