the Australian brown snake even tho it ain't brown prob a relative, also known as easten brown.
Illinois has many snakes. Look at the pictures and decide which snake you mean.
https://en.wikipedia.org/wiki/List_of_snakes_of_Illinois
From your description - it sounds like a California King Snake (non-venomous)
Cottonmouth (white mouth). The answer's in the question.
Sea Kraits are white with black stripes. Or black with white stripes if you like to look at it that way.They're a sea snake, highly venomous, but only aggressive when provoked repeatedly.King snakes are also black and white, striped. They are non-venomous, land based and eat other snakes.Hope this helped!
There are several different types of black snakes with white rings. I'll list those that I know of: Death Adder Stephen's Banded Snake Bandy Bandy California Mountain King Snake Long Nosed Snake I can't really think of anymore right now, but try typing these names into Google image search and see if you recognise any of these.
The red-bellied black snake, which is native to eastern Australia, is black with a distinctive pink-red belly.
its a Black & White Desert Phase California Kingsnake
what does a white snake with black diamonds on the back mean
One possibility is the common jumping spider, which has a black body and white rings around its legs. Its scientific name is phidippus audax.
Diamondback rattlesnake
The yellow-bellied sea snake has black on the top. It has a yellow belly. It also has black dots.
The gopher snake, it's not venemous
Red, Black, & White.