Definition and revision of the viduatus species-group of North American Pachybrachis Chevrolat (Chrysomelidae: Cryptocephalinae)
By Riley, E.G. and R.J. Barney.
BioOne - Abstract and References
Riley, E.G. and R.J. Barney. 2015. Definition and revision of the
viduatus species-group of North American
Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 69(1): 25–59.
Abstract
The
viduatus species-group of Nearctic
Pachybrachis Chevrolat, 1836 is defined and revised. The group is composed of nine species, including
four described as new species:
Pachybrachis bloxham Riley and Barney,
Pachybrachis chester Riley and Barney,
Pachybrachis deceptor Riley and Barney, and
Pachybrachis kentuckyensis Riley and Barney.
Lectotypes are designated for
Cryptocephalus m-nigrum Melsheimer, 1847,
Cryptocephalus trinotatus Melsheimer,1847, and
Pachybrachys intricatus Suffrian, 1852, and a neotype is designated for
Cryptocephalus viduatus F., 1801.
A key to species is given, and a description, figures, and range map are presented for each species. Some new descriptive terminology is introduced for the male genitalia. The male median lobe is described and illustrated for the first time for each species. Adults of the
viduatus species-group appear to be associated with the plant genus
Hypericum L. (Clusiaceae).
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Hypericum (St. Johnswort) is a large genus of N. Amer. plants.