The ones I have are very variable. Some have stripes on the apical half of the elytra, others are dark. It may retire tails to separate them but my limited experience with tails has not been very successful.
a picture from PT (P. obliquemaculata) in the FREY collection (Basel) fits the pictures quite well, the diff to P. philippensis I don't know, Breuning's key is not helpfully again.