Here are some less common muscari:
Muscari parviflorium
Muscari aucheri 'Autumn Glory' ex. Ray Cobb (thanks to a kind member of this forum)
These two are to my best knowledge the only autumn flowering Muscaries.
However yesterday in my garden I found a seedling of Muscari azureum with the flowerbud just visible. I will mark this one to see if it has the same habit next year.
Poul