Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of Eastern Canada Author Barney, Robert J. Gus R. Douglass Land-Grant Institute, West Virginia State University, Institute, West Virginia, United States 25112 - 1000 rbarney@wvstateu.edu Author LeSage, Laurent Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Neatby Building, Ottawa, Ontario, Canada K 1 A 0 C 6 Author Savard, Karine Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Neatby Building, Ottawa, Ontario, Canada K 1 A 0 C 6 text ZooKeys 2013 2013-09-19 332 95 175 http://dx.doi.org/10.3897/zookeys.332.4753 journal article http://dx.doi.org/10.3897/zookeys.332.4753 1313-2970-332-95 9C1CE036FFBF8D66FF024F74FFB0FFCC 577540 Pachybrachis bivittatus (Say, 1824) Habitus 2 ; Map 2 ; Figures 6a , 7e , 8a , 9a, 9b Cryptocephalus bivittatus Say, 1824: 440. Pachybrachys albescens Suffrian, 1858: 404. Recognition. Body very large, primarily yellow ( Habitus 2 ); prothorax suffused with rufous; elytral punctation confused, with somewhat apparent rows on disc; elytral color pattern bivittate, with outer vitta rarely entire ( Figure 7e ); pygidium yellow ( Figure 8 a ); male size large: length 3.12 +/- 0.16 mm, width 1.64 +/- 0.05 mm. These characters allow identification of even singleton females. Distribution. Pachybrachis bivittatus is a transcontinental species found across Canada and the United States ( LeSage 1991 ; Riley et al. 2003 ). In Ontario, it is most common in the southernmost counties. In Quebec , it occurs in the Ottawa Valley and in the St. Lawrence Lowlands. The Saguenay Region is probably its northernmost limit ( Map 2 ). Material examined. ONTARIO: Carleton Co., Constance Bay, 26.VI.1995, B. F. & J. L. Carr [1♀, CNC]; Elgin Co., New Sarum, 16.VI.1956, W. J. Brown [5♂ 5♀, CNC]; Essex Co., Amherstburg, 6.VI.1936, G. M. Stirrett [2♀, CNC]; Belle River, 26.V.1946, S. D. Hicks [1♂, CNC]; Kingsville, 23.V.1962, Kelyone & Thorpe [1♀, CNC]; same data, except 19.VI.1954, G. B. Wiggins [1♀, ROM]; Pelee Island, 24-27.VI.1935, R. C. Osburn [1♂ 1♀, OSUC]; same data, except 4.VII.1940, W. J. Brown [2♀, CNC]; Point Pelee, 29.VI.1931, W. J. Brown [4♂ 7♀, CNC]; same data, except 1.VI.1933, G. M. Stirrett [3♂, CNC]; same data, except 29.V.1955, S. D. Hicks [3♂ 4♀, CNC]; same data, except 28.VI.1961, Kelton & Brumpton [2♂ 1♀, CNC]; Haldimand Co., Dunnville, 7.VII.1961, W. & W. Plath [1♂, USNM]; same data, except 7.VIII.1961, W. Plath [1♂, USNM]; Kent Co., Thamesville, 15.VI.1930, G. M. Stirrett [1♀, CNC]; Rondeau Park, 5.VI.1985, J. M. Campbell & A. Davies [1♀, CNC]; Lambton Co., Grand Bend, 17.VI.1956, W. J. Brown [1♂ 4♀, CNC]; Lincoln Co., Beamsville, 19.VII.1939, S. D. Hicks [3♂ 3♀, CNC]. QUEBEC : Argenteuil Co., Carillon, 24.V.1974, E. J. Kiteley [2♂ 1♀, CNC]; Deux-Montagnes Co., La Trappe, 5.VIII.1932, J. Ouellet [1♂, CEUM]; Ile-de-Montreal Co., Montreal , F. Knab [1♂, USNM]; same data, except 31.V.1941 [1♀, CEUM]; same data, except 15.VI.1961, M. Larochelle [1♂, CEUM]; same data, except 3-14.VII.1969, E. J. Kiteley [4♂ 6♀, CNC]; same data, except 17.VI, J. Ouellet [1♀, USNM]; Nicolet Co., Becancour , 24.VI.1967, J. L. Laliberte [1♂, IDM]; Portneuf Co., Neuville, 9.VII.1939, J. Filteau [1♂ 1♀, CEUM]; Sainte-Catherine, 17.VI.1953, J. C. Aube [1♂ 7♀, LEM]; same data, except 8.VII.1956 [2♀, LEM]; Quebec Co., Sainte-Foy, 17.VI.1933, V. Boulet [1♀, CEUM]; Cap-Rouge, 27.VI.1956, J. L. Laliberte [2♂ 2♀, IDM]; Saguenay Co., Riviere Deschenes , 22.VI.1966, A. Franeslier [1♀, CEUM]; Saint-Jean Co., Cantic, 25.VI.1983, on Salix amygdaloides Andersson, A. Larochelle [1♂ 3♀, CNC]; Saint- Maurice Co., Pointe-du-Lac, 3.VII.1937 [1♀, CEUM]; Vaudreuil Co., Rigaud, 12.VII.1908, J. Ouellet [1♂, CEUM]. Host plants. Pachybrachis bivittatus is typically associated with willows ( Salix spp., Salicaceae ) ( Fall 1915 ; Barney 1984 ; Downie and Arnett 1996 ; Clark et al. 2004 for literature review). In Canada, MacNay (1958) reported a light infestation of Pachybrachis bivittatus on the foliage of willow along the river banks north of Coaldale, in Alberta. In eastern Canada, LeSage (personal observations) observed it on Bebb's willow ( Salix bebbiana Sarg.), sand-bar willow ( Salix interior Rowlee), and stalked willow ( Salix petiolaris J.E. Smith). Larochelle (see above) collected it on the peach-leaved willow ( Salix amygdaloides Andersson). The larvae feed in the litter, on willow leaves, but only when they are decayed ( LeSage 1985 ). Comments. With its large size, bivittate elytra, and close association with willows, Pachybrachis bivittatus is one of the easiest species to identify.