PARASITES OF ANIMALS. 47 
Ixodes albipictus Packard. Figures 42, 43,44. 
This was originally found upon a tame moose by Mr. W. 
G. Hays, but doubtless infests other animals. 
Izodes unipictus Packard. 
This is about a quarter of an inch long and has an oval 
form. Isis reddish brown, or mahogany-color, with a central 
silvery spot upon the back. It often attacks men and vari- 
ous animals. It has been found in New England, but is more 
common southward. 
In Europe, numerous species have been found. 
Ixodes vicinus is very troublesome to dogs. It is of a brown- 
ish violet color, crenulated posteriorly. It has five radiating 
brown spots and some brown dots. 
Ixodes reduvius infest sheep and dogs. It has a pale red or 
yellowish color, and becomes more than a quarter of an inch 
long. It must not be confounded with the ordinary “ sheep- 
tick” (see page 89). 
Mites, acarus Linn. 
This genus, which originally included all the mites, is now 
restricted to those that are allied to the cheese-mite. The 
mouth parts are prolonged into a rostrum or beak. There is 
a constriction of the body between the second and third pair 
of legs, dividing it somewhat into two parts. 
The Cheese-mite (Acarus stro Linn.). 
This species ordinarily lives in cheese and other articles of 
food; but has sometimes been observed parasitic upon man, in 
certain diseased conditions. 
The Meal-mile (Acarus farine De Géer). 
This species, found in meal and flour that has been in- 
jured is sometimes accidentally swallowed while living. 
Acarus dysenterie Linn. was found living in the excreta of 
a person attacked by violent dysentery. It also sometimes oc- 
cursin large numbers about wine and beer casks, and may 
therefore be swallowed accidentally. 
Glyciphagus hippopodos has been found in the ulcerated feet 
of horses. A species of mite also occurs in the diseased 
feet of sheep. Digitized by Microsoft® 
