My reference, Insects, Their Natural History and Diversity, shows saturalis as dark like this one and says it's "boldly striped". It also shows the notch on the top of the black stripe near the "shouler". According to this reference I think we have some calligrapha in the zygogramma section. The Calligrapha lunata is a more red-brown stripe and doesn't have that notch in the stripe near the "shoulder". Lunata also does have a "notch" about half way back on the lower brown section. zygogramma's is rounded but smooth.

Here are the images that match the ones in this book.


Z. suturalis


C lunata

However, I don't know the variability in markings for each species. As you can see in my image, it has both the shoulder and the side notches, plus the dark coloring. So perhaps the shoulder notch is a good field mark and the side notch isn't?