The Great Southern White (Ascia monuste) is a little smaller than the similar Florida White (Glutophrissa drusilla) and the Cuban White (Ganyra menciae).
The best diagnostic character is the bright blue tips of the antennae.

1st, 2nd & 3rd photo: Oracabessa area, Jamaica, 20 January 2018
4th & 5th photo: Hope Gardens, Kingston, Jamaica, 18 January 2018