Where did you get those from? Some of them are known only from the Art book (as far as we know) and we do not tolerate scanned pages from that book on this website.
As far as what they are, the first two are not Chroniclers. One is a Luskan Marauder, and unused concept from Munch development, the other is an early Glukkon concept from Abe development, back when they were called "Oldgers," which may be the source of the last known Chronicler design. The meech is not actually a meech, but what we call the "1%er," which is an early meetle concept. The squidgy thing in the bottom right is the meetle larva they settled on. The final image is not a Khanzumer, but an Oktigi in possession of an unspecified host. It is, however, the spitting image of Sekto, so the host's identity follows on from there.
I'm going to put this to the guys, but we need to know where those images came from. They are, however, well known pieces of artwork.
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