- The Nearctic leafhoppers placed in the genus Sorhoanus Ribaut
by Oman (1949) were found to belong to several genera, some of
which are Holarctic in distribution. None is properly placed in
Sorhoanus as presently defined. The genera Sorhoanus, Zelenius
Emel'yanov, Boreotettix Lindberg, Lebradea Remane, and Acharis
Emel'yanov are redefined and their distribution and relationships
discussed. A key is presented for the differentiation of the genera
from other related elements in the Nearctic fauna.
The characterization of the genera and differentiation of species
within the genera are primarily based on the inner genitalia of the
male sex and the seventh sternum of the female. Of the 19 species
assigned to Sorhoanus by Metcalf (1967), all were studied except
acarifer (Lethierry) and fieberi (Metcalf). Twelve of them were
placed generically: Sorhoanus contains assimilis (Fallen), schmidti
(Wagner), medius (Mulsant and Rey), and hypochlorus (Fieber). Deltocephalus abiskoensis Lindberg, type-species of Arctotettix
Linnavuori, is a synonym of Rosenus cruciatus (Osborn and Ball);
thus Arctotettix is a junior synonym of Rosenus Oman, Zelenius
Emel'yanov contains orientalis (De Long and Davidson), uhleri
(Oman) and fidus (Knull). Boreotettix Lindberg contains caricis
(Gillette and Baker); Acharis Emel'yanov contains ussuriensis
(Melichar); and Lebradea Remane contains flavovirens (Gillette and
Baker), and helvinus (Van Duzee). Sorhoanus bicornis Linnavuori is
a junior synonym of flavovirens Gillette and Baker, bidentatus
De Long and Davidson is the synonym of caricis Gillette and Baker.
Three species, Deltocephalus debilis Uhler, Thamnotettix lenis
Van Duzee, and Deltocephalus spicatus De Long, heretofore placed
in Sorhoanus, appear not to be properly placed in any existing genera
and remain of uncertain position.
The type-species of Lebradea Remane, calamagrostidis
Remane, and three Palearctic Sorhoanus borrowed from Dr. A. F.
Emel'yanov; suncharicus Dlabola, tritici (Matsumura), and minutulus
Vilbaste, although not occurring in the Nearctic Region are nevertheless
discussed in this paper.
One Holarctic distributed species, Deltocephalus xanthoneurus
Fieber, originally included by Ribaut (1947) in Sorhoanus, and transferred
to Cazenus by Oman (1949), is described and returned to