What is "trogolegnum"

Trogolegnum is a genus of moths in the Sphingidae family, containing only one species, Trogolegnum pseudambulyx, which is known from Mexico.

The forewing is strongly excavate below the apex especially in males. The proboscis is very short and weak. The forewing colour and pattern are similar to Adhemarius donysa but the subbasal band extends to the costal edge.