Wappes identified a specimen of mine from Cerro Jesus as N. ruatana, and it doesn't exactly look like the photos on Bezark's website. My specimen doesn't exactly match yours. I don't know what to tell you. Species in this tribe do have variability, and again, if you have but a single specimen, then it is really hard to get an identification unless the species is well known, or unless there is something unusual in it is morphology. By the way, I agree that it is not N. mexicana.... I have seen hundreds of them from southern Texas and they are quite different.