1	Nearctic species	2
–	Palearctic species	6
2	Head and pronotum yellow to reddish brown with no defined black markings (Fig. 9h); body length 10.4 to 12.4 mm; male genitalia simple with barely trifid apex (Fig. 2o–p)	Graphoderus liberus
–	Head with black V-shaped markings and pronotum with two well-defined black bands (Fig. 9g, i–k); body length larger, up to 15.7 mm; penis with distinct trifid apex (Fig. 2m–n, q–v)	3
3	Posterior black band of pronotum not reaching posterior margin, or sometimes separated from margin by a piceous-reddish area, anterior black band separated from anterior margin (Fig. 9k); male protarsus with 25–35 adhesive discs, male mesotarsus with 13–20 discs; male penis deeply trifid, invaginations separating lateral lobes from central lobe distinctly deeper than width of lateral lobes of penis apex, as in Figure 2u–v	Graphoderus perplexus
–	Posterior black band of pronotum contiguous with posterior margin, anterior black band of pronotum contiguous or not with anterior margin; male tarsal discs various, mesotarsus with 0, 12 or 25–30 discs; trifid apex of male penis shallower, invaginations not deeper than width of lateral lobes of penis apex (Fig. 2m–n, q–t)	4
4	Anterior black band of pronotum contiguous with anterior margin (Fig. 9j); female pronotum with weak corrugated sculpture; male mesotarsus not dilated and lacking adhesive discs; male protarsal claws different in shape and size, posterior claw with sinuate ventral margin and about 2/3 length of anterior claw; male parameres very long, at least 1/4th longer than penis (Fig. 2s)	Graphoderus occidentalis
–	Anterior black band of pronotum mostly separated from anterior margin by a more or less evident reddish area; female pronotum with conspicuous corrugated sculpture; male mesotarsus dilated with adhesive discs on ventral surface; male protarsal claws equal or anterior claw only slightly longer than posterior which does not have a sinuate ventral margin; male parameres shorter, not more than 1/5th longer than penis (Fig. 2m, q)	5
5	Metanepisterna (“metasternal wing”) broad, width between 0.48 and 0.60 mm; female elytron at shoulder with less pronounced striolate punctures; male mesotarsus with 12 discs in two rows; central penis lobe of trifid apex much shorter than lateral lobes (Fig. 2m–n)	Graphoderus fascicollis
–	Metanepisterna (“metasternal wing”) narrower, width between 0.30 and 0.41 mm; female elytron at shoulder with pronounced strioles; male mesotarsus with 25–30 discs in four rows; central penis lobe of trifid apex about as long as lateral lobes (Fig. 2q–r)	Graphoderus manitobensis
6	Posterior black band of pronotum narrow, equal to only 1/3 to 1/2 of medial yellow area, contiguous with posterior margin (Fig. 9d); epipleuron broader at level of abdominal ventrite II than at level of ventrite I, body “pear-shaped” due to posteriorly widened epipleura; male genitalia as in Figure 2g–h	Graphoderus bilineatus
–	Posterior black band of pronotum broad, equal to at least 1/2 of medial yellow area, or if narrower then not contiguous with posterior margin; epipleuron evenly tapering from base to apex, body not overly “pear-shaped”	7
7	Ventral side of body mostly piceous; metatibia and metatarsus dark brown to black; female pronotum with conspicuous corrugated sculpture; anterior black band of pronotum continuous with anterior margin, in males this band is narrow and equal to about 1/3 of medial yellow band (Fig. 9a); male genitalia as in Figure 2a–b. East Palearctic	Graphoderus adamsii
–	Ventral side of body testaceous-rufous, sometimes piceous but then entire habitus darker; female pronotum with or without conspicuous corrugated sculpture; anterior black band of pronotum continuous or not with anterior margin, if continuous in males broader then 1/3 of medial yellow band. East or west Palearctic	8
8	Transverse black bands of pronotum contiguous with anterior and posterior margin, respectively (Fig. 9b); anterior mesotarsal claw longer than posterior claw, strongly in males weakly in females; female pronotum with weak corrugated sculpture; male mesotarsus not dilated and without discs; trifid apex of male penis very shallow, parameres very long, at least 1/4th longer than penis (Fig. 2c–d)	Graphoderus austriacus
–	Anterior and posterior black bands of pronotum contiguous or not with margins; mesotarsal claws of same length in both sexes; female pronotum corrugated or not; male mesotarsus dilated and with adhesive discs on ventral surface; male penis apex moderate to deeply trifid and parameres shorter, maximum 1/5th longer than penis (Fig. 2e–f, i–l, w–x)	9
9	Transverse black bands of pronotum not contiguous with anterior and posterior margin, separated by narrow bands or rarely almost contiguous; female elytra granulated or not; male mesotarsus with 14–60 adhesive discs that are small and usually in irregular rows	10
–	Posterior black band of pronotum contiguous with posterior margin, anterior transverse band contiguous with anterior margin or narrowly separated by rufous area (Fig. 9e); female elytra never granulated; male mesotarsus with 12–14 discs that are larger and in two regular rows	11
10	Epipleura rather wide at level of abdominal ventrites I-III (Fig. 10f–h); central lobe of male trifid apex in lateral view concave (Fig. 2l). East Palearctic, east of Yenisei-Angara river	Graphoderus elatus
–	Epipleura narrower at level of abdominal ventrites I-III (Fig. 10a–b); central lobe of male trifid apex in lateral view convex (Fig. 2x). Palearctic, west of Yenisei-Angara river	Graphoderus zonatus
11	Minimum distance between meso- and metacoxae almost same as width of metaventral process between mesocoxae (Fig. 11a); female posterior metatarsal claw about 1.8 the length of anterior claw, which is not strongly curved apically; male mesotarsus with 12 discs in two rows ventrally, formula 4-4-4; male penis apex less deeply trifid and central lobe in lateral view more abruptly raised (Fig. 2e–f). East Palearctic	Graphoderus bieneri
–	Minimum distance between meso- and metacoxae clearly less than width of metaventral process between mesocoxae (Fig. 11b); female posterior metatarsal claw about 1.5 the length of anterior claw which is strongly curved apically; male mesotarsus with 14 discs in two rows, formula 6-4-4; male penis deeply trifid and central lobe in lateral view describing a long evenly convex curve (Fig. 2i–j). Palearctic	Graphoderus cinereus