The pupa of a multicolored Asian lady beetle, Harmonia axyridis, found on a silk tree on Union Street. This small tree is growing out of some kind of buried fuel bunker facing the Gowanus; covered over with dirt, it has long since sprouted all sorts of things. The parent tree is probably the one full of bean-like seed pods at the moment at the corner of Union and Bond.
In addition to this pupa, there was a larva crawling nearby. There are pictures of that strange-looking creature, and more information about this introduced species, here. I bought this one home for the photograph, and will transplant it, so to speak, into the Back Forty.