Abstract
The adult of Phyllocnistis populiella was described by Chambers in 1875. No detailed descriptions of the immature forms of this species have appeared in publication, although descriptions of other species in the genus have been published. Sich (1902), in his paper on P. suffusella Zell., presents a critical discussion of earlier works on the genus and gives a comprehensive account of the general features of the immature forms, although he omits details on setation and some other features of taxonomic interest. Certain aspects of larval and pupal morphology have been treated by Grandi (1932), Kozlovsky (1955) and Trägårdh (1913), while Hering (1951) and Needham (1928) have discussed structure as related to habit.

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