Those with life-stories such as the dragon-flies 'are said to undergo partial transformation, and are termed' Hemimetabola. '.    From Wordnik.com.  [The Life-Story of Insects] Reference

Wherein lies the fundamental difference between these Holometabola on the one hand and the Hemimetabola and Ametabola on the other?.    From Wordnik.com.  [The Life-Story of Insects] Reference

In all Ametabola and Hemimetabola these are visible externally long before the penultimate instar has been reached; in the Holometabola they are not seen until the pupal stage.    From Wordnik.com.  [The Life-Story of Insects] Reference

Hemimetabola, 35.    From Wordnik.com.  [The Life-Story of Insects] Reference