Looks ok for A. porosus. A. boisduvalii can look similar in the area with relatively poorly developed black markings on the elytra. This seems to have the fringes of white setae at the side margin of the pygidium characteristic of A. porosus.
These seem to be two different species, but neither of them is A. concolor. First one may be A. porosus (but would need a view of the rear to confirm), second one A. montanus.
I do not believe this is Paropsisterna octosignata, described as having 4 spots on each elytron This only has three and as described "with three red spots, one of which is the largest near the thorax, two placed transversely near the apex" Though the colour is not red this is probably a yellow morph of Paropsisterna sexpustulata
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