THE SAND-FLEA. 135 
a 
are so slight, both have been united into one species. The 
habits of both are identical. Human blood is to the taste of 
both, but is not preferred as being better and richer than 
that of the normal hosts. 
REMEDIES.—Fresh insect-powder, dusted or blown among 
the hairs of the infested animals, is an excellent remedy; 
it should also be dusted upon the places where they sleep. 
As the insect-powder usually bought is very much adulter- 
ated or too old, it would be best if we grew in our gardens 
the plant from which it is made. This is Pyrethrum vroseum, 
atather pretty plant, which makes also a nice border for 
flower-beds. The flower-heads should be cut off when 
fully expanded, and have to be dried in the shade. When 
needed these dry heads should be ground as fine as possi- 
ble, and excellent results will follow wherever such powder 
is used in a legitimate way, ¢. ¢. against such insects as can 
be killed by it. 
THE SAND-FLEA. 
(Sarcopsylla penetrans L.). 
This is a flea that is not found in Minnesota, being an in- 
habitant of Central and South America, where it abounds in 
and about indian lodges, wood-cutters’ camps, and similar 

Fig. 113.—Sand-fiea, female with eggs. Greatly enlarged. After Karsten. 
places free from the rank vegetation foundin those countries. 
This parasite is known by a number of names, such as Jigger, 
Chigoe, Chique, Biche, or Pique. As it has a somewhat 
different form from those mentioned before it has been taken 
