Nominotypical ssp. was described from Yunnan and in Obayashi & Niisato opus it is written that: "We have not seen enough material for comparison and therefore tentatively treat this form as a subspecies.." var. prescutellaris sensu Pic: "Elytres relativement courts et larges (forme typique), parfois un peu relevés vers l'écusson, ou bien élytres plus longs et fortement surélevés vers l'écusson."
And I don't believe that the Pic had more material for comparison than the Japanese authors Most probably simply Pyrocorennys latipennis (Pic, 1927) is right combination, I agree. But no one establish synonimy with this name formally (in fact).