After reading your description of the slightly different description, and darker bands found inland, I did more Internet research, focusing on photos. I wanted to see any examples of darker, wider bands.

Then I began finding “hits” on photos of Jalisco milk snakes, found just to the east of Nelson’s. Usually, Jalisco snakes have bands of fairly uniform width, looking like common Milk snakes. However, I found a photo of one having very wide, black bands. I found another photo of a Jalisco that was almost all black, with only patches of red. (I double checked to see if it was a Black Milk mislabeled, it was not.)

I found no examples of Nelson’s Milks have very wide black bands, and none that were almost black in color.

I’m wondering if the snakes that you saw that matched neither Sinaloans nor Nelson’s traits were either intergrades with a Jalisco, or a Jalisco from adjacent regions to the east?

Ameron
Portland/Vancouver

1.0 Boa constrictor imperator (Hog Island)
1.0 Lampropeltis triangulum nelsoni
1.0 Agrionemys horsfieldii kazakhstanica

Flicker link below shows my 55-gallon vivarium & snake photos.
Link

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