I am writing a mass setting that I would like to call the "Mass of the Butterfly". Since it doesn't include all of the ordinary, it's a missa brevis.
I started with Google Translate, but it is convinced I mean "mass" in the physics sense and gives me constructions based around massa. The word I think I want is papilio, and I think it should be in the genitive, so papilionis.
How do I combine all of this? Is the complete phrase "Missa Brevis Papilionis" correct (and is it idiomatic to capitalize it)?