Pachybrachis calcaratus Fall, 1915

Barney, Robert J., LeSage, Laurent & Savard, Karine, 2013, Pachybrachis (Coleoptera, Chrysomelidae, Cryptocephalinae) of Eastern Canada, ZooKeys 332, pp. 95-175: 115

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Pachybrachis calcaratus Fall, 1915


Pachybrachis calcaratus Fall, 1915   Habitus 3 View Habitus 3 ; Map 3 View Map 3 ; Figures 5c View Figure 5 , 7b View Figure 7

Pachybrachys calcaratus   Fall, 1915: 389


Color dull yellow, with diffuse brown markings on pronotum, with more contrasting markings on elytra ( Habitus 3 View Habitus 3 ); ocular lines absent; front tibiae of male with subapical rectangular tooth on inner margin, due to abrupt narrowing of tibia, and with long stout curved terminal spur ( Figure 5c View Figure 5 ); terminal spur of front tibia of female reduced to narrow spine; male size small: length 2.09 ± 0.07 mm, width 1.106 ± 0.04 mm.


Pachybrachis calcaratus   has been found across the central portion of the United States but only in small numbers (Barney, unpublished data). Within the area of this study, it is restricted to the Carolinian Life Zone in southern Ontario ( Map 3 View Map 3 ).

Material examined.

ONTARIO: Essex Co., Roseland, 24.VI.1942, 'compared with type’, J. A. Wilcox [1♂, CDFA]; same data, except 24.VI.1944, S. D. Hicks [1♂, CNC].

Host plants.

No information was recorded on the specimens collected in southern Ontario. Clark et al. (2004) reported Pachybrachis calcaratus   nibbling purple loosestrife, Lythrum salicaria   L. ( Lythraceae   ), in Ohio.


Pachybrachis calcaratus   is another of Fall’s (1915) Group C species that have "great variation in the degree of (elytral) maculation." The tibial spur ( Figure 5c View Figure 5 ) is a defining character. Pachybrachis calcaratus   was very likely associated with the Carolinian Life Zone in southern Ontario in the past. However, it has not been seen from there for the last 68 years.