214 INSECTS AFFECTING DOMESTIC ANIMALS. 
described it in 1818 under the name which has been universally adopted 
since, and it has received frequent mention since that time. Itis very 
similar to the Trinoton luridum, but may generally be easily separated 
by the more diffuse coloring and its larger size, being 6 mm. (3 lines 
according to Denny) in length. The two species are not known to 
infest the same kinds of birds. This louse occurs on a number of 
species of geese and swans, and on one gull; according to Denny, on 
the common domestic goose, on the Larus canus, and Cygnus bewickii; on 
Cygnus olor, according to Burmeister; on C. musicus and olor, according 
to Piaget; and on Anser rujicollis, according to Grube. 
While the Trinoton luridum we have found to be rather common in 
America, the conspurcatum has not been met with, but the opportunities 
for examining geese have been limited. 
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 recognize the application of the description to this form and rede- 
seribed it under the name of Trinoton squalidum. Later writers, how- 
ever, have adopted the earlier name, 
and there will probably be no fur- 
ther 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 
referred to the Smew, and Piaget 
states that it has been taken from 
Dendrocygna arborea and Anser albi- 
Srons. 
THE PIGEON LOUSE. 
(Colpocephalum longicaudum Nitzsch.) 
Fic. 138.—Trinoton lituratum—enlarged oceurs on pigeons, in 1818, butit was 
(author's illustration). : ° : 
again described by Denny in 1842, 
who gave it the name of turbinatum. 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 
Nitzsch described this form, which 
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