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Species Pachybrachis nigricornis


Geographical variation in Pachybrachis nigricornis (Coleoptera: Chrysomelidae).
By Balsbaugh Jr, E.U. and W.L. Tucker.
The Coleopterists Bulletin 30(2): 117–131., 1976
JSTOR

Balsbaugh Jr, E.U. and W.L. Tucker. 1976. Geographical variation in Pachybrachis nigricornis (Coleoptera: Chrysomelidae). The Coleopterists Bulletin 30(2): 117–131.

Key to all sixty-four species of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) in the eastern USA.
By Barney, R.J.
The Coleopterists Bulletin, 73(1): 85-96., 2019
BioOne

Barney, R.J. 2019. Key to all sixty-four species of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) in the eastern USA. The Coleopterists Bulletin, 73(1): 85-96.

Abstract

A key to the males of all 64 species of Pachybrachis Chevrolat, 1836 (Coleoptera: Chrysomelidae: Cryptocephalinae) currently known from the eastern USA is presented. Type, figure, and map citations from the literature are given for each species. Pachybrachis newmani Jacobson is reported as a replacement name for Pachybrachi

Descriptions of four new species of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) of the eastern USA.
By Barney, R.J.
The Coleopterists Bulletin, 73(1):67-75., 2019
BioOne

Barney, R.J. 2019. Descriptions of four new species of Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) of the eastern USA. The Coleopterists Bulletin, 73(1):67-75.

Abstract

Four new species of Pachybrachis Chevrolat, 1836 in the eastern USA are described: Pachybrachis cubs Barney, new species; Pachybrachis ekstromorum Barney, new species; Pachybrachis troosevelti Barney, new species; and Pachybrachis zellersorum Barney, new species. Pachybrachis zellersorum belongs to the Pachybrachis viduatus species-group, and the other three new species belong to the Pachybrachis atomarius species-group. A description, figure, and range map are presented for each new species. Couplets in published keys are modified to accommodate the new species.

Definition and revision of the atomarius species-group of NA Pachybrachis (Chrysomelidae: Cryptocephalinae), including 9 n. spp.
By Barney, R.J.
The Coleopterists Bulletin 72(1): 9-74., 2018
BioOne

Barney, R.J. 2018. Definition and revision of the atomarius species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae), including descriptions of nine new species. The Coleopterists Bulletin 72(1): 9-74.

Abstract

The atomarius species-group of Nearctic Pachybrachis Chevrolat, 1836 is defined and revised.

The group is composed of 24 species:

Pachybrachis archboldi Barney;
Pachybrachis atomarius (F. E. Melsheimer);

Definition and revision of the luridus species-group of North American Pachybrachis Chevrolat (Chrysomelidae: Cryptocephalinae).
By Barney, R.J.
The Coleopterists Bulletin 71(1): 1-45., 2017
BioOne

Barney, R.J. 2017. Definition and revision of the luridus species-group of North American Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae). The Coleopterists Bulletin 71(1): 1-45.

Abstract
The luridus species-group of Nearctic Pachybrachis Chevrolat, 1836 is defined and revised.

The group is composed of ten species, including two described as new species:
Pachybrachis confusus Bowditch,
Pachybrachis dilatatus Suffrian,
Pachybrachis discoideus Bowditch,
Pachybrachis femoratus (Olivier),

Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) Endemic to Florida, including descriptions of four new spp.
By Barney, R.J.
The Coleopterists Bulletin 70(1): 31-52., 2016
BioOne

Robert J. Barney. 2016. Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) endemic to Florida, including descriptions of four new species. The Coleopterists Bulletin 70(1): 31-52.

Abstract
Eight species of Pachybrachis Chevrolat have been found to be endemic to Florida:

Pachybrachis archboldi Barney, new species;
Pachybrachis clarki Barney, new species;
Pachybrachis conformis Suffrian;
Pachybrachis deyrupi Barney, new species;
Pachybrachis discoideus Bowditch;

Definition and revision of the viduatus species-group of North American Pachybrachis Chevrolat (Chrysomelidae: Cryptocephalinae)
By Riley, E.G. and R.J. Barney.
The Coleopterists Bulletin 69(1): 25–59., 2015
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,

Notes on Pachybrachys and descriptions of new species.
By Bowditch, F.C.
Canadian Entomologist 41: 312-324., 1909
Full Text

Bowditch, F.C. 1909. Notes on Pachybrachys and descriptions of new species. Canadian Entomologist 41: 237-244, 285-292, 312-324.