Ambia melanalis is a moth in the family Crambidae. It was described by George Hampson in 1906.[1] It is found in South Africa.[2]
The wingspan is about 14 mm. The forewings are black brown, suffused with greyish and tinged with yellowish in places. There is an antemedial white spot on the costa with a slight oblique sinuous whitish line from it to the inner margin and a slight white discoidal lunule defined by black. There is also a postmedial white spot on the costa with an excurved line from it to vein 4, then almost obsolete and retracted to a white patch on the inner area below the end of the cell. There is also a white subapical point and a slight subterminal line between veins 7 and 4. The hindwings are black brown tinged with yellowish and slightly suffused with grey. There are two small white spots at the end of the cell and a postmedial line represented by a white bar from the costa and traces of a line towards the tornus. There is also a white terminal line from the costa to vein 6, angled outwards at the apex.[3]