There is an interesting story to this plant. It was recently given to me by someone I helped with an orchid problem. She has literally dozens of divisions of this; the parent plant belonged to her late father-in-law. He grew species, but the tag is long since gone. To me, it looks like bowringiana. The growth habit is right, the flower size is right, the base of the pseudobulbs is right, and the flower form and markings look right.
And we all know that I may be as wrong as rain. The flower color is not true in the close up; it is darker than that, and closer to the color in the photo of the whole plant.
Help? I need an expert opinion.