Image locations: Doi Suthep-Pui National Park Chiang Mai.
Additional notes: Michael Geiser "I've just checked type material of T. variceps and Palpoxena indica (which was formerly placed in Platyxantha, based on its similarity with variceps). It's neither of the two, because the antennae look different. Also the closely related T. occipitalis differs in the shape and colour of certain antennal segments. All these characters are base on males, but I assume that yours is a male, because of the yellowish fore-head (females have either completely black or completely yellow heads). Your beetle looks very much like a species that I've got here (from Tak and Mae Hong Son prov., NW Thailand). It may actually still be new, but I still need to double-check some of L.N.Medvedev's "Platyxantha"-species which are unknown to me".