Pachybrachis trinotatus
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Ordo: Coleoptera
Familia: Chrysomelidae
Genus: Pachybrachis
Name
Pachybrachis trinotatus (F. E. Melsheimer, 1847) – Wikispecies link – Pensoft Profile
- Cryptocephalus trinotatus F. E. Melsheimer, 1847: 170.
- Pachybrachis trinotatus
Recognition
Pronotum red with heavy, sharply defined, black M-mark, and with pale anterior and lateral margins; elytra entirely black (Habitus 17); male size large: length 3.09 ± 0.13 mm, width 1.75 ± 0.09 mm.
Distribution
Pachybrachis trinotatus is an eastern species distributed from Kansas to the Atlantic Coast in the United States (Riley et al. 2003[1]), and in Ontario and Québec in eastern Canada (Map 17).
Material examined
ONTARIO: Carleton Co., Stittsville, 26.VII.1961, G. Brumpton [1♂, CNC]; Essex Co., Leamington, 27.VI-3.VII.1931, W. J. Brown [1♂ 1♀, CNC]; Hamilton Co., Ancaster, 2.VII.1958, J. E. H. Martin [1♂, CNC]; Hastings Co., 10.VII.1938, J. F. Brimley [1♀, CNC]; same data, except 24.VII.1960, J. F. Brimley [1♂ 1♀, CNC]; Marmora, 2.VII.1952, C. Boyle [1♀, CNC]; Lambton Co., Grand Bend, 10.VII.1939, G. E. Shewell [1♂ 1♀, CNC]; Lanark Co., Bell’s Corners, 15.VII.1954, S. D. Hicks [3♂ 2♀, CNC]; same data, except Lanark, Kerr Lake 13.VII.1975 [1♂, CNC]; Lincoln Co., DeCew Falls, 29.VI.1940, S. D. Hicks [1♂, CNC]; same data, except 27.VII.1940 [1♂ 1♀, CNC]; same data, except VIII.1941 [1♂, CNC]; Northumberland Co., Hamilton, 14–19.VII.1984, M. Sanborne [1♀, CNC]; Prince Edward Co., 21.VII.1937, beaten from oak, J. F. Brimley [1♀, CNC]; same data, except 4.VII.1946 [1♀, CNC]; same data, except 11.VIII.1947 [1♀, CNC]; same data, except 14.VII.1948 [1♀, CNC]; same data, except 10.VIII.1948 [1♀, CNC]; same data, except 20.VI.1949 [1♂, CNC]; same data, except 6.VII.1949 [1♀, CNC]; same data, except 17.VII.1950 [5♂ 3♀, CNC; 1♂, AMNH; 2♂ 1♀, St. John’s wort blossom, FSCA]; same data, except 7.VII.1955 [1♂, CNC]; same data, except 29.VII.1956 [1♀, CNC]; same data, except 27.VII.1962 [1♂ 1♀, CNC]; Renfrew Co., Hwy 512 15 km W Eganville, 5.VII.1996, B. F. & J. L. Carr [1♂, CNC]; Simcoe Co., Craighurst, 30.VIII.1963, G. G. E. Scudder [1♀, CNC]; Tiny Township, Cawaja Beach, 17.VII.1968, J. C. E. Riotte [1♂ 1♀, ROM]; Toronto Co., Toronto, Kelly Lake, 13–26.VII.1933, L. J. Milne [2♂ 1♀, UNHC]; Victoria Co., Coboconk, 7.VIII.1940, S.D. Hicks [1♀, CNC]; Wellington Co., Guelph, VII.1924, D. C. B. Duff [1♂, ROM].
QUÉBEC: Huntingdon Co., Covey Hill, 1.VII.1927, W. J. Brown [1♂, CNC]; Île-de-Montréal, Montréal, 10.VII.1977, sweeping field, E. J. Kiteley [1♂, CNC]; Missisquoi Co., Phillipsburg, 31.VII.1972, J. L. Laliberté [1♂, IDM]; Québec Co., Québec, 26.VII.1902, F. Knab [1♂ 1♀, USNM]; Vaudreuil Co., Hudson Heights, 24–30.VII.1956, Lindberg [1♀, CNC]; Rigaud 29.VI.1907, J. Ouellet [1♂, CEUM]; same data, except 18.VIII.1921 [2♂, CEUM]; same data, except 23.VII.1974, E. J. Kiteley [2♀, CNC].
Host plants
No information was available from specimens examined. Barney and Hall (2011)[2] reported handpicking specimens from St. John’s wort, Hypericum punctatum L. (Clusiaceae), and observed feeding, mating and oviposition on Hypericum punctatum, Hypericum perforatum L. and Hypericum dolabriforme Vent. in the lab. Following Banks (1912)[3], New Jersey tea, Ceanothus americanus L. (Rhamnaceae) was often given by authors as a host for Pachybrachis trinotatus (complete citation in Clark et al. 2004[4]).
Comments
With its black elytra and reddish pronotum ornamented with a large, black, M-shaped marking, Pachybrachis trinotatus is very easily distinguished from all other Canadian species of the genus (Habitus 17). It is widely distributed in southern Ontario but is found only in the Ottawa River Valley and south of the eastern Townships in Québec (Map 17). Both areas very likely represent its northernmost distribution limit in this province.
Taxon Treatment
- Barney, R; LeSage, L; Savard, K; 2013: Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of Eastern Canada ZooKeys, 332: 95-175. doi
Other References
- ↑ Riley E, Clark S, Seeno T (2003) Catalog of the leaf beetles of America north of Mexico (Coleoptera: Megalopodidae, Orsodacnidae and Chrysomelidae, excluding Bruchinae). Coleopterists Society, Special Publication no. 1, 290 pp.
- ↑ Barney R, Hall S (2011) New host plant records for selected Cryptocephaline leaf beetles (Coleoptera: Chrysomelidae) in Kentucky. The Coleopterists Bulletin 65(1): 15-19. doi: 10.1649/0010-065X-65.1.15
- ↑ Banks N (1912) At the Ceanothus in Virginia. Entomological News 23(2): 102-110.
- ↑ Clark S, LeDoux D, Seeno T, Riley E, Gilbert A, Sullivan J (2004) Host plants of leaf beetle species occurring in the United States and Canada. The Coleopterists Society, Special Publication No. 2, 476 pp.
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