I prefer your version. Yes, the form 'snake species' is used nowadays, even though 'snake' is not technically an adjective; but I try to avoid such a usage if there is an alternative.
I would say 'species of butterfly'. 'Butterfly' is being used as a general term.

Perhaps I should start a new thread on the new use of the word 'snowflake'.

I'm more concerned about your last sentence: 'How serious is it to mandate that my international include this comma?'

It's American idiom. I've never heard it in England.

'Nervous of performing' sounds right to my ear.

I rather like the saying, "If you've got an issue, get a tissue."

Hairy - you're absolutely right: 'three laning' is indeed ugly.

@vwmoll
Welcome to the forum. If you care about the language, you'll fit in seamlessly. Yes - you're absolutely right - we can get tetchy from time to time. You'll get used to it.
Skeet

I wonder if the Duke meant 'same exact' in the modern sense. Possible he meant that the Order was 'exact', that is, neat and soldierly, just as on exercise.

WAIT HERE UNTIL RED LIGHT SHOWS.
Shows what?