Image of Arctornis magnaclava Holloway ♂ (holotype) — ♂ (holotype)

Arctornis magnaclava Holloway sp. n.

♂♂ 19mm. The wings are satiny white with grey fringes, though the satiny scales are sparser at the base of the hindwing and along the CuA system of the forewing. There are denser white discal patches on all wings. There is a broad rufous brown bar between the antennae that has a concave ventral boundary. The palps are rufous with darker tips. The legs are spotted in the usual places. The genitalia have an uncus as in sinuoharpe. The valves are oval with a conspicuous, club-like harpe that extends beyond the end of the valves. The harpe is irregularly sinuous and invested with small spines over the distal third.