Lachlathetes gigas is a species of antlions in the subfamily Palparinae.

[1] The species was named by Dalman in 1823, based on an insect figured by Dru Drury as a variety of Myrmeleon libelluloides.

Head, neck, and thorax yellowish brown, with a black longitudinal stripe running along the middle.

Abdomen yellowish brown in preserved specimens (probably green when living).

Wings of equal length, the anterior being broadest, all marked with a great number of red-brown spots, and clouds of various shapes and sizes, and appearing to be composed of fine lattice-work like gauze, and perfectly transparent where they are not clouded.