Revision of Chlorionidea Low (Hemiptera: Delphacidae) with the description of two new species from Italy, and comments on anti-symmetry in male genitalia of Delphacidae.

The genus Chlorionidea Low until now contained two species: C. flava Low and C. bromi Emeljanov. Recently we discovered two new species of this genus in Italy, which we describe in this paper as C. apenninica sp. nov. and C. sibillinica sp. nov. For all four Chlorionidea taxa we provide descriptions and an identification key. Details of male and female genitalia, aspects of head morphology and the fifth instar nymph of C. sibillinica are shown. In addition we discuss phylogenetic relationships between the four taxa. In three of the four species anti-symmetry in male genitalia is observed. We discuss this phenomenon and compare similar cases in other Delphacidae. Finally we summarize the available data on life cycle, food plants and geographical distribution of Chlorionidea species. [ABSTRACT FROM AUTHOR]