SIPHONAPTERA. 493 



The Chigoe (Chig'o) or Jigger, Sarcopsylla penetrans 

 (Sar-co-psyl'la pen'e-trans), is a small flea found in the West 

 Indies and South America, which often causes serious 

 trouble to men by burrowing beneath the skin of the foot 

 It is the fertile female that does this, and soon after enter- 

 ing its host the body of the flee becomes distended with 

 eggs and acquires the size of a pea. 



In the southern United States the names Chigoe and 

 Jigger are improperly applied to the harvest-mites, which 

 are the immature six-legged forms of various mites that 

 attach themselves like ticks to the skin and become gorged 

 with blood. 



