H. christinae inhabits subalpine to lowland areas frequenting river banks and stream sides.

Adult moths can be distinguished from similar appearing species in the genus Helastia as they have a "conspicuous transverse grey-ish white median band on the upper side of the forewing".

This species was first described by Robin C. Craw in 1987 using specimens collected by J. S. Dugdale at Roaring Meg Creek, Kawarau Gorge in Central Otago.

[3] Craw states H. christinae may be present in other parts of the South Island but that these records need further research to confirm the presence of this species.

[3] This species inhabits subalpine to lowland areas, frequenting river banks and stream sides.