Collicroana Holloway^{Gen. n.}

Type species: berlyi sp. n.

The features of this taxon are unusual enough to set aside the principle of not basing a description, particularly at generic level, on a single specimen, and no obvious genus could be found for even a tentative placement. Even the association with the Throana Walker group of genera needs further investigation. Indeed, the specimen was held over from description in Parts 15 & 16 for this last reason because the genitalia lack the defining features of migration of the ostium forwards into the seventh sternite; this sternite is also unmodified, though trapezoid and somewhat shorter than the tergite. The ostium is set between the seventh and eighth sternites and is unmodified, the ductus bursae runing from it, somewhat fluted, to expand into a irregularly pyriform corpus bursae.

The general appearance and dark brownish grey, almost black, coloration of the body and wings is reminiscent of the geometrid genus Collix Guenée, but such species have a prominent black discal mark on the forewing rather than a white bar in the orbicular position, and also have a strongly banded pattern on the underside of the wings. The underside is more uniform in Collicroana, with fasciae reproduced paler, though the forewing has a black bar in the discal area with the white orbicular mark recurring strongly just basal to it, the feature that associates it with the Throana group. All wings above and below have a black spot anterior to M3 on the distal margin, and also fine, pale-edged, irregularly zigzag postmedial and submarginal fasciae and a blackish medial.

The labial palps have the deeply scaled second segment curved downwards to twice the length of the head, with the almost straight, slender third segment continuing its line and being about 20% longer.