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Two diaspidid species of Quadraspidiotus MACGILLIVRAY occur on oaks in Poland: Q . zonatus (FRAUENFELD) and Q. ostreaeformis (CURTIS). Separation of these species is reliable only on the basis of the microscopic characters. The main difference between Q. ostreaeformis and Q. zonatus is the presence of the dorsal macroducts on 4th abdominal segment in Q. ostreaeformis and the absence of these ducts...
The taxonomie characters of the fore wings and antennae in Habrolepis dalmani (WESTWOOD, 1837) demonstrate a great variation. The characters of Habrolepis italicus DELUCCHI, 1965 fall within the range of this variation and that is the reason why the status of H. italicus as a good distinct species has not been proved sufficiently.
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