Key to the South Korean Species of Stenopogoninae 

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  1. Large, 29-33 mm; amber red flies with clouded yellow wings . . . Stenopogon koreanus sp. n. 

  -   Much smaller, darker flies . . . 2

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   2. Auxiliary cross vein aligned above (in 1st posterior cell), or positioned slightly basal to, basal vein of 2nd posterior cell; abdomen sharply conical and stout; heavily              setose flies . . . Grypoctonus aino Speiser, 1928

    - No auxiliary cross vein present . . . 3

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  3. Medium sized, 11-18 mm; antennal postpedicel yellow . . . Cyrtopogon centralis Loew, 1871 

  -   Smaller flies, 7-10 mm, darker flies, antenna entirely black/light pollinose . . . 4

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  4. Two distinct bright yellow pollinose abdominal bands on tergites 1 and 3; females unknown . . . Cyrtopogon lateralis (Fallen, 1814)

  -    Wings with 4 distinct black spots; red-brown pollen on male tergites 6 and 7; females unknown . . . Cyrtopogon quadripunctatus Hermann, 1906

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