The males were determined to be too closely alike in the early days. It was from the size variation and color of the females that determined the early races of the Eclectus Parrot. This gives us eleven races of the Eclectus Parrot. But this was in the past. It is there, but was then known as E. r. pectoralis.
Ornithologists have a great habit of changing names on many species of birds.
The lumpers keep combining races and making a shorter list while the dividers keep separating out the individual differences of the races and make a longer list. This is why there were approximately 8600 species of birds in the world when I was in high school in the 1950's and now there are 9600 species. What an increase especially when there are avian species that are going extinct at an ever increasing rate. Well the Red- sided Eclectus was given a new scientific name and is now known as E. r. polychloros. In 1913 when the Magillvray's Eclectus was first discovered in the Cape York Peninsula of Australia, it was given a scientific name of Eclectus pectoralis macgillvrayi.