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Sepedon aenescens Wiedemann
Approx. 8~12mm. Very similar to Sepedon found in the West, but once source says that the oriental population has been classified as a separate species based on coloration, male genitalia, etc: http://www.nativefishlab.net/library/tex... (p. 57). That source also mentions S. violacea as a possibility, but since my photos don't have enough detail, it is futile to try to distinguish it further.
Low low to medium grasses.
I thought Penthetria or Bibionidae were possible, but am not familiar enough with them to figure it out.