Theoxena is a monotypic moth genus in the family Geometridae erected by Edward Meyrick in 1883.

[7][3] In 1883 Edward Meyrick placed the species into the newly created genus Theoxena.

Forewings narrow, hindmargin rather strongly sinuate; dull white, slightly sprinkled with dark fuscous; a curved dark fuscous median streak from inner margin near base almost to apex, sharply defined above, suffused beneath; a black dot in disc, and a row of dots on hindmargin.

Hindwings elongate, narrow, apex broadly projecting; white; a blackish dot in disc, and a row on hindmargin.

[14] It has been hypothesised that the host species for T. scissaria larvae may be in the genus Carmichaelia.

[15] This moth is classified under the New Zealand Threat Classification system as being nationally vulnerable.