omy oo 
reer erewmid rhe eG The: eye ee ee 
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ARACHNIDA. 263 
The same form occurs on the blue heron, and I have taken it in 
immense numbers from the subcutaneous tissue of this bird at Ames. 
In the genus Dermaleichus and allies we have an immense number 
of forms occurring on various species of birds, scarcely any of which 
have been studied in this country. 
They will form a most interesting study, though, so far as present 
knowledge indicates, there is little of economic importance to be 
attached to them. 
THE Cystic Fow. MITE. 
(Laminosioptes cysticola Vizioli.) 
This mite is described as living normally on the surface of the skin 
or under scales, but commonly working into the subcutaneous connec- 
tive tissue, more rarely to the deeper portions, and on its death the 
presence of the dead matter results in the formation of a calcareous 
cyst or miliary body, which gave rise to the technical name of the 
species. 
Chickens, pheasants, and geese are among its hosts. 1 do not know 
of its occurrence in the United States. 
INTERNAL CHICKEN MITE. 
(Cytodites nudus Vizioli.) 
These are minute mites that live in the air passages of gallinaceous 
birds particularly, and, according to Railliet, they appear to the naked 
eye like minute active granules running over the surface of the walls 
of the air cells and in the trachea and bronchi. They appear to suck 
simply the serosity of the tissues, and, unless in great number, to 
cause no great inconvenience to their hosts, but if in great numbers 
to cause active irritation and asphyxia. 
The species has been observed in this country at Washington, D.C.,! 
and I have specimens from Dr. Hassall, of Baltimore, taken from the 
peritoneum of chicken. 
MITES INFESTING MICE. 
We may mention here two interesting little mites, Myobia museuli 
and Myocoptes musculinus, which infest mice. The former I have found 
many times on mice at Ames, and have also received it from Professor 
Bruner, of Nebraska University. 
‘Riley Am. Nat., Vol. XVII, p. 422. 
