The Collaborative International Dictionary of English v.0.48:

Tales \Ta"les\ (t[=a]"l[=e]z), n. [L., pl. of talis such
   (persons).] (Law)
   (a) pl. Persons added to a jury, commonly from those in or
       about the courthouse, to make up any deficiency in the
       number of jurors regularly summoned, being like, or such
       as, the latter. --Blount. --Blackstone.
   (b) syntactically sing. The writ by which such persons are
       summoned.
       [1913 Webster]

   Tales book, a book containing the names of such as are
      admitted of the tales. --Blount. --Craig.

   Tales de circumstantibus [L.], such, or the like, from
      those standing about.
      [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TALES
       Template Attribute Language Expression Syntax (TAL, METAL, ZOPE)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

TALES, Eng. law. The name of a book kept in the king's bench office, of such
jurymen as were of the tales. See Tales de circumstantibus.