Source : Webster's Revised Unabridged Dictionary (1913)

Simpai \Sim"pai\, n.[Malay simpei.] (Zo["o]l.)
   A long-tailed monkey ({Semnopitchecus melalophus}) native of
   Sumatra. It has a crest of black hair. The forehead and
   cheeks are fawn color, the upper parts tawny and red, the
   under parts white. Called also {black-crested monkey}, and
   {sinp[ae]}.