catflap.org Online Dictionary Query

  Jigger \Jig"ger\ (j[i^]g"g[~e]r), n. [A corrupt. of chigre.]
     1. (Zo["o]l.) A species of flea ({Tunga penetrans, or
        Sarcopsylla penetrans, or Pulex penetrans), which
        burrows beneath the skin; called also jigger flea. See
        Chigoe.
        [1913 Webster]
  
     2. (Zo["o]l.) Any one of several species of small red mites
        (esp. Tetranychus irritans and Tetranychus Americanus)
        of the family Trombiculidae, which, in the larval or
        leptus stage, burrow beneath the skin of man and various
        animals, causing great annoyance. Also called chigger.
        [Southern U. S.]
        [Webster 1913 Suppl. +PJC]

  jigger flea /dʒˈɪɡə flˈiː/
  Sandfloh  [zool.]
           Note: Sarcopsylla penetrans
     Synonyms: sand flea, chigger
  
   see: sand fleas, chiggers, jigger fleas