hey eric, some of the tetraspis clones like 'c#1' will occasionally have flowers like this; they are actually breeding to try and get more of the red. tetraspis can have spots of color here and there, actually in recent past times breeders were trying to select for 'alba' clones that didn't have any of the red spots as they viewed it as a 'defect'; now they are trying to bring it back. tetraspis is possibly supposed to be a mix of something with the speciosa that hasn't been seen in a long time which was all dark red. there was a variety of speciosa supposedly that could have mostly red and then white here and there, but I don't know if taxonomists agree on anything; so tetraspis could be a variety of speciosa that just has been losing it's color to a genetic defect because of lack of habitat and inbreeding (speciosa was only known from a very small locality way back, and I think that one habitat is now gone...). so if it's labeled tetraspis it's likely that's what it is
nice mexipedium!