Sorry but Please understand me II actualyl states that Rationalist are phelgamtic on page 26 - in the historic table of evolment of the categories.
Teh tempraments, as used by teh ancients and galen, relate to the tempraments as used in astrology (they only seperated somewhere mid 1800's - eve of 1900's). They aslo relate to diurinal astrology which uses cold and hot her. I'm not expert but these relatings do make sense
Sanguine = air temprament,
Melancolic = Earth
Coleric = fire
Phelgmatic = water - cold and wet
Air relates to light concept type thinking, and performing and showing off - often thinking in the untangible
Earth = heavey plodding types, stable plodders if you like, like resources and traditions
Fire = ralleying the cause (the 1960's had a glut of planets in Leo hence all the campaigning - womens rights and Veitnam, nuclear disarmemebr etc), Idealist as a name suits them better. In MBTI they are the Emo group but that is a relatively new spin, however if you take and NF they are deeply emo
Phlegmatics; are water, cold and deep. Astrologicaly this is the emotional group, however their thinking is usually broader and more considered and on a surface level less emotional than the NF's. They make decisions at a rather heavier level.
I'm not giving a really great profile of the tempraments from the astro perspective but I cna assure you they fit properly with where Keisey got to with them