Wyat:
Arched rows are typical of Sioux-style beadwork since the stitch is placed next to the previous lane. Cheyenne-style beadwork is often "flatter" since the thread on one lane is hooked into the thread from the previous lane. The technique and flatter appearance is usually a true measure of Cheyenne-style beadwork -- if the colors and patterns used aren't an automatic giveaway. The book "Native American Beadwork" by Georg J. Barth shows and explains both techniques quite well. If you don't have a copy, it will be a great addition to your library. I hope this helps.
