Syllepte macallalis is a moth in the Crambidae family. It was described by West in 1931. It is found in the Philippines (Luzon). The wingspan is about 40 mm. The forewings are white, the veins buff-brown and buff-brown on the costa. The subbasal area is buff-brown on the upper half, the distal edge reaching down to the inner margin. The antemedial fascia consists of a deeply dentate, buff-brown line and the spot in the cell and another on the discocellulars are buff-brown. The postmedial fascia are buff-brown, commencing at the costa as a line, inwardly oblique to the base of a vein, sharply angled, then outwardly oblique to vein 4, where it becomes a wide suffusion to the inner margin. The subterminal fascia consists of a buff-brown line inwardly oblique to vein 4, slightly excurved to ve