What Is The Scientific Name Of The Biggest Ant In The World?

Ants can be as large as 52 mm
 Source:  en.wikipedia.org references 24 and 25:

1. ^ Hölldobler & Wilson (1990), p. 589
2. ^ Shattuck SO (1999). Australian ants: Their biology and identification. Collingwood, Vic: CSIRO, p. 149. ISBN 0-643-06659-4.

The Bulldog ant (Myrmecia brevinoda), found in Australia can be over 40 mm (over an inch long) 
  Source:  en.wikipedia.org

Another source claims that the male Siafu ant is the largest, but it's not likely to be found outside the nest.

These are giANTs!