Marshall, Trans. N.Z. Inst., 28, 1896, p. 289.
As understood by Marshall this genus is characterized by the presence of a small basal cell formed by the base of Cu2 and A; however in some closely-related forms this little cell is not complete. The diagnosis of the genus should, therefore, be established as follows: Sc short, ending free, M simple; Cu2 sinuous, vein A ending in its elbow and forming thus a little basal cell, or ending free at some distance before the elbow of Cu2, the little cell not being then completely closed.
Genotype: C. flava Marsh.
This genus is apparenty confined to New Zealand.
The antennae and palpi were not seen by Marshall; the first ones are about as long as the thorax in the male and noticeably shorter in the female in which the flagellar segments are about as long as wide only; the palpi are rather short with the segments subequal to each other.