Pachybrachis bivittatus (Say 1824)

Habitus 2.Dorsal habitus of Pachybrachis bivittatus. Scale bar, 1 mm.

Map 2.The known distribution of Pachybrachis bivittatus in eastern Canada. OR – Ottawa River; SLR – St. Lawrence River; SR – Saguenay River.

Figure 6.Pronotum: a reddish, with close-up of marginal bead, Pachybrachis bivittatus b mottled, Pachybrachis spumarius c with black M-mark, Pachybrachis m-nigrum d almost black, Pachybrachis nigricornis carbonarius.

Figure 7.Elytral punctures and coloration: a in rows in deep striae, Pachybrachis luctuosus b confused in basal half, in rows in apical half, Pachybrachis calcaratus c all confused, Pachybrachis hepaticus d confused and mottled, Pachybrachis spumarius e vittate with marginal vitta interrupted, Pachybrachis bivattatus f black, margined with yellow, Pachybrachis nigriconis carbonarius g entirely black, Pachybrachis luridus.

Figure 8.Pygidium: a largely yellow, Pachybrachis bivittatus b with well-defined yellow spots, Pachybrachis cephalicus c with faint reddish spots, Pachybrachis spumarius d black, Pachybrachis atomarius.

Figure 9.Sexes: a male abdomen, ventral view, Pachybrachis bivittatus b female abdomen, ventral view, Pachybrachis bivittatus.