@chriselidie : I think H. diffundens caterpillar has red dashes along the sides. Yours certainly looks like a Geometrinae, but I do not know one with the lateral eyespot on the first abdominal segment. It would be great if you could rear it to discover its species.
Thanks donhe, that's interesting. It does have a different spot pattern, just thought it was an individual variation. I took it in yesterday and will see how it develops.