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Remarks:
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palpus strongly reduced (at most as long as diameter of prementum) or absent; prementum slender, at least 4 times as long as its diameter; first postsutural supra-alar seta distinctly shorter than notopleural setae or absent; postmetacoxal area sclerotized; preapical anterodorsal seta on fore tibia distinctly longer than preapical dorsal seta; wing cell r4+5 with a petiole at least as long as 1/6 postangular section of M; abdomen sub-cylindrical
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