Nocloa Smith, 1906, Jour. New York Ent. Soc., 14: 13.
Type species: Nocloa plagiata Smith, 1906. Subsequent designation by Hampson, 1910, Catalogue of the Lepidoptera Phalaenae in the British Museum, 9: 253.

Nocloa consists of two distinct groups of species. The first group contains the type species Nocloa plagiata and the second group consists of the two other species in the genus, rivulosa and pallens. There are significant differences in both superficial appearance and the male genitalia. However I am uniting the two groups in an attempt to avoid over-spliting generic names, something too easy to do in this tribe. Nocloa plagiata has well defined maculation in the forewing, but the markings of both rivulosa and pallens is much more obscure, particularly in pallens. The clasper of the valve in the male genitalia is c-shaped in plagiata but more convential and not c-shaped in rivulosa and pallens. Nocloa plagiata appears to be a late summer species, but both rivulosa and pallens are collected more commonly in the spring. The latter group of two species appears to be somewhat intermediate between Nocloa and the undescribed genus Nocloini New Genus 2.

I have defined the genus Nocloa primarily on the basis of the shape of the frontal process of the head. This frontal process consists of a large ring with a round central prominence. The lower margin of the ring is confluent with the clypeal shelf and there are breaks on the ventral ends of the lateral margins of the ring.

The larva and its foodplants are unknown.