Metallarcha erromena is a moth in the family Crambidae. It was described by Turner in 1908. It is found in Australia, where it has been recorded from Queensland.[1]
The wingspan is about 39 mm. The forewings are dark-fuscous with orange-ochreous markings. There is a small spot at the base of the costa and another on the mid-base, as well as a large quadrangular spot before the middle, unequally divided by a fine fuscous line on the median vein. The hindwings are orange-ochreous with a dark-fuscous antemedian spot and terminal band.[2]