[PDF.18vc] A Monograph of the Jumping Plant-Lice or Psyllidae of the New World (Classic Reprint)

A Monograph of the Jumping Plant-Lice or Psyllidae of the New World (Classic Reprint)

[PDF.lk97] A Monograph of the Jumping Plant-Lice or Psyllidae of the New World (Classic Reprint)

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 |  2016-06-22 | Original language:English |  9.00 x.55 x6.00l,.78 | File type: PDF

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Excerpt from A Monograph of the Jumping Plant-Lice or Psyllidae of the New World
As the work progressed and other large collections were studied, many unsatisfactory features were found in this system and a great many difficulties encountered. Some of these have been mentioned in more or less detail in my former papers on this group. It became apparent that any classification based principally on wing venational characters would be artificial and unsatisfactory. At t...

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