mmmhm... this is the holotype male of Callimetopus longior (from Negros). Your first specimen should be a male and the second a female. The third seems to be a male (fore legs longer, last ventrite rounded at apex). According to Hüdepohl, the basal part of the antennomeres 3-5 are white (3-4 in longicollis), the elytra show numerous small spot (but no transverse pre-median band as in longicollis)... longior, longior, longicollis?