Not a question, just a suggestion. There's a sizeable collection of herps from Hawai'i at Carnegie Museum if you need additional samples. They are from the Island of Hawai'i, collected in 1967.
Thanks Stephen. I'll bear it in mind ... the timing of the collection is interesting. My group spent a few months in Hawaii in 2015, and the 1967 sample is a long way back in the invasion history .. .morphology might be instructive.