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That's good that you got hold of a specimen and were able to examine it in detail Paul.
Walter Pfeigler has an image of the female on this site at https://diptera.i...ost_123106
The rather long head seems to be the first character to notice. The occiput width being very obviously greater than in other Neria giving the head a somewhat elongated appearance.
Since you have a male is there any chance you could get drawings done of the genitalia.
Also Heige, could you be more precise about location (a lat/long would be great - just use Google Earth). And any idea about habitat would be valuable too.