They eat each other as well, but sadly not enough.I'd say Harlequin too.. They do vary quite a lot in their markings, as @Box Brownie pointed out.
A none indigenous pest species.
Once they run out of aphids they turn their attention to our native ladybirds, caterpillar eggs, and anything similar they can shove in their gob!
I've only seen a single ladybird so far this year. I usually have loads in the garden so don't know what has happened to them this year.