PARASITES OP ANIMALS. 47 



Ixodes albipidus Packard. Figures 42, 43,44. 



This was originally found upon a tame moose by Mr. W. 

 G. Hays, but doubtless infests other animals. 

 Ixodes unipictus Packard. 



This is about a quarter of an inch long and has an oval 

 form. Is is 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 siro 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-mite (Acarus farince De Ge*er). 



This species, found in meal and flour that has been in- 

 jured is sometimes accidentally swallowed while living. 



Acarus dysmterice Linn, was found living in the excreta of 

 a person attacked by violent dysentery. It also sometimes oc- 

 curs in large numbers about wine and beer casks, and may 

 therefore be swallowed accidentally. 



Glycipliagus hippopodos has been found in the ulcerated feet 

 of horses. A species of mite also occurs in the diseased 

 feet of sheep. 



