Black, the antenn♀, palpi, labella and front corners of the first two abdominal segments pale yellow, the last segment and hind edge of the preceding orange yellow. Front at narrowest part one-fifth as wide as either eye, the upper three pairs of frontal bristles much larger than the others, one pair beneath insertion of antenn♀, facial ridges strongly diverging below antenn♀ slender, almost as long as the face, the third joint five times as long as the second.