I almost stepped on this little critter. It blended into my garage floor. It is about about the size of my hand, with huge bulbous eyes that immediately caught my attention. There was a distinct white bump below\between the eyes. It froze when I turned on the light and did not move at all until I turned the light off. Then it moved faster than my eyes could follow in the direction of my garden.
I am on an island in the San Francisco Bay, California. The current temperature is ranging from 50 (night) to 65 degrees and rainy season has just started (late this year). It blended so well with the garage floor that my camera had problems focusing on it.