Color variations in same species of both vertebrates and invertebrates has been well documented on islands vs. mainland populations . Speaking from personal experience with insects such as the cicada I have found many variations in same-species due to both habitat as well island isolated populations.

Not only have variations in species been documented but also in behaviors. Recently a species of Purse web spider has been found on Tuckernuck Island off the western tip of Nantucket. It's slightly smaller than its southern Florida counterpart and exhibits different behaviors. Purse web spiders generally make a six inch long tube that extends from a tree, or grass to the ground. The Purse web spiders on Tuckernuck island only make their tub-like webs along the ground.

I know that temperature variations can cause changes in species (like determining sex) but I don't know if I've heard anyone say that temp. variations are known to cause color variations. I suppose color variations can also be caused by proximity to a molt. Then of course there's the possibility that they are a regional variation caused through breeding. I suppose there are other possibilities that I'm not thinking of as well.