I'm not agree with you Dan. It is most likely Dymasius huedepohli Tavakilian & Nearns, 2014 female, because gracilicornis is located in China, Vietnam and Laos. I would like to see a picture of gracilicornis if you've got one?
Philippe, You should research names in TITAN before making comments. D. gracilicornis Hudepohl and D. gracilicornis (Gressitt) are not the same. The name D. gracilicornis Hudepohl was replaced with D. huedepohli Tavakilian & Nearns in 2014.