52 
LOUSE OF THE GOOSE. 
(Trinoton lituratum Nitzsch.) 
This quite distinct species of louse has been known to entomologists 
since 1818, when it was described by 
Nitzsch. Denny, however, did not re- 
cognize the application of the descrip- 
tion to this form and redescribed it 
under the name of Trinoton squalidum. 
Later writers, however, have adopted 
\jj the earlier name and there will probably 
\^(L be no further confusion regarding it. 
It is quite easily distinguished from 
the other species of Trinoton, being 
considerably shorter, smaller, and of 
a nearly white color. 
It occurs, according to Denny, on 
Anser albifrons, the domestic goose, 
and on Anas clypeata. It is also re- 
ferred to the Smew, and Piaget states 
that it is has been taken from Dendro- 
cygna arborea and Anser albifrons. 
Fig.39. — Trinoton lituratum. (Original.) v j J 
THE PIGEON LOUSE. 
(Colpocephalum longicaudum Nitzsch.) 
Nitzsch described this form, which occurs on pigeons, in 1818, but it 
was again described by Denny in 1842, who gave it the name of turbi- 
natum. Giebel retained both these names, evidently considering that 
they referred to distinct species, but Piaget has placed them together. 
The species would not seem to be so abundant as some of the other 
species of Pigeon lice, and it has not been found as yet on pigeons that 
we have had an opportunity to examine. 
It does not appear to have been found on any other birds, but has 
been taken from the common domestic pigeon and also the Turbot. 
THE SWAN LOUSE. 
(Colpocephalum minutum Rudow.) 
Eudow seems to have been the first to recognize this species, though 
its occurrence upon the swan (Cygnus musicus) makes it rather strange 
that it should have escaped observation so long. It is a very small, 
species, as would be inferred from the name, and this may account in 
part for its not having been earli- r noticed. 
