We get them here in OK. I've seen several sizes, anywhere from about 3/4" to maybe twice that size. That's length, width maybe 1/4" - 3/8". You can google it and see a picture with description.
What Is The Exact Size Of An Average Sized June Bug?
They are around 1 to 11/2 inches long! Not very big!
About 1 inch long and half an inch wide