To quote "Bucky O'Hare"...... "Let's croak us some toads!!"
And yet, ironically, the Meskeen do not exist in the SFU ISC - they were added to the Concordium in SFC2, but are so far not a feature of the ISC you read about in the likes of the Prime Directive RPG.
In fact, I don't even know if the Meskeen are able to show up in the likes of Prime Directive at all (even as a minor ISC member race) or if IP issues prevent this.
(In the 'proper' ISC, the Veltressai are the most prominent of the Five Races - and the capital world of the ISC is Veltrassa.)
Oh, and as an aside - ISC fans might be interested to look out for SFB Module Y2 - it's going to introduce the early ISC as a new 'setting', and thus feature the ships flown by the Five Races prior to the construction of the unified fleet, as well as the first generation of unified hull designs!