Pachybrachis m-nigrum (F. E. Melsheimer, 1847)
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https://dx.doi.org/10.3897/zookeys.332.4753 |
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persistent identifier |
https://treatment.plazi.org/id/96343598-115F-6F8A-8917-19DB7F96842D |
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treatment provided by |
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scientific name |
Pachybrachis m-nigrum (F. E. Melsheimer, 1847) |
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Pachybrachis m-nigrum (F. E. Melsheimer, 1847) Habitus 8 View Habitus 8 ; Map 8 View Map 8 ; Figure 6c View Figure 6
Cryptocephalus m-nigrum F. E. Melsheimer, 1847: 170.
Pachybrachys intricatus Suffrian, 1852: 180.
Recognition.
Pronotum usually with thick, black, M-shaped marking; elytra yellow with variable black markings, but these usually leaving basal, lateral and sutural margins yellow, in addition to a basal and median yellow spots on each elytron ( Habitus 8 View Habitus 8 ); male size medium: length 2.59 ± 0.11 mm, width 1.42 ± 0.07 mm.
Distribution.
A typical eastern species distributed in the eastern half of the United States ( Riley et al. 2003). Its presence in the south of the eastern Townships, in Québec, corresponds to the northernmost limit of this species ( Map 8 View Map 8 ).
Material examined.
NEW BRUNSWICK: York Co., 15 km W of Tracy, off Rt 645, 45.6837°N, 65.8809°W, 22.vii.2007, red pine forest, sweeping foliage of Comptonia peregrina , R. P. Webster [1?, RWIC].
QUÉBEC: Châteauguay Co., Ormstown, 12.VII.1977, sweeping, E. J. Kiteley [1♀, CNC]; same data, except 30.VII.1978 [1♂, CNC]; Huntingdon Co., Covey Hill, 30.VI.1927, G. S. Walley [1♀, CNC]; same data, except 1.VII.1927, W. J. Brown [1♀, CNC].
Host plants.
An old record by Schwarz (1890) concerned Toxicodendron radicans (L.) Kuntze) ( Anachardiaceae ), but this was probably based on misidentified specimens of Pachybrachis tridens . Clark et al. (2004) reviewed the literature. More recently, Webster swept it from Comptonia peregrina ( Myricaceae ) ( Webster et al. 2012). Recent surveying in Kentucky barrens/prairies by Barney et al. (2011) cited Pachybrachis m-nigrum collected from and found to feed on St. John’s-wort, Hypericum dolabriforme Vent. ( Clusiaceae ) ( Barney and Hall (2011)).
Comments.
Based upon external morphlogy, these specimens appear to be Pachybrachis m-nigrum . However, extensive dissections of material from across the eastern half of the US reveal an externally similar species, but with a distinctly different aedeagus, from the midwestern states (Barney, unpublished data).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.