What is Allocato Comitatu?

Legal Definition
In old English practice. In proceedings in outlawry, when there were but two county courts holden between the delivery of the writ of exigi facias to the sheriff and its return, a special exigi facias, with an allocato comitatu lssued to the sheriff in order to complete the proceedings. See Exigent.
-- Black's Law Dictionary
Legal Definition
An old writ used in outlawry proceedings.
-- Ballentine's Law Dictionary