The Underpass Hugate appears to be an adult form of a regular ant. Unlike their siblings, "hugate" has no definition; the word "huge" was probably added as a prefix, hence their large size. They all carry swords and wear snake-like armor.
Attacks
Underpass Hugates have only two attacks. One is where they will make a front slice, and another is where it will dash at the player with its sword swung.