It emerges from this list that...Melko has a son ('by Ulbandi') called Kosomot: this, it will emerge later, was Gothmog Lord of Balrogs, whom Ecthelion slew in Gondolin.
I lent my LT2 to a friend so someone who has it - could you check the index for references about Gothmog, Ulbandi, and Kosomot to see if we can find any more references of this sort?
For that matter, other volumes of HoME too.
This strange origin of Gothmog gives more root to the notion I had that Balrogs were somewhat similar in appearance to Morgoth. :/