The Collaborative International Dictionary of English v.0.48:

Macavahu \Ma`ca*va"hu\, n. (Zool.)
   A small Brazilian monkey (Callithrix torquatus), -- called
   also collared teetee.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Teetee \Tee"tee\, n. [Sp. tit['i].]
   1. (Zool.) Any one of several species of small, soft-furred
      South American monkeys belonging to Callithrix,
      Chrysothrix, and allied genera; as, the collared teetee
      (Callithrix torquatus), and the squirrel teetee
      (Chrysothrix sciurea). Called also pinche, titi, and
      saimiri. See Squirrel monkey, under Squirrel.
      [1913 Webster]

   2. (Zool.) A diving petrel of Australia (Halodroma
      wrinatrix).
      [1913 Webster]