Masdevallia eurynogaster

Masdevallia eurynogaster is a small species from Ecuador and Peru.  It is another of the Saltatrices group, with a belly-like bulge at the base of the flower and glandular hairs lining the inside of the sepaline tube.  The name "eurynogaster" means "big-bellied."  The plant is 8 cm and the flowers very nearly that size.  I have two plants, one with darker flowers than this.