The pictures I'm describing, I guess you could call it "red" in the sense it's a reddish flesh tone, but it's not a deep red like the rest of the skin, more of a pale fleshy red.
I have the epub digital codex which makes referencing a location a nightmare

In the section called "Colours of the Hive Fleets", the first picture is a Behemoth swarm fighting some Ultramarines with a Flyrant and a couple of Harpies/Crones/whatever. Later in the same section after some pictures of some Hormagaunts there's another Behemoth Flyrant, then later on there's a picture of 3 Gargoyles, one of which is a Behemoth.
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