1	Apical half of mentum acute, triangular (e.g., Figs 25, 34–35)	2
–	Apical half of mentum rounded (Figs 26–29, 31–33) or quadrate (Fig. 30)	4
2	Punctures of frons and clypeus unisetigerous; parameres as in Fig. 71	Peltonotus talangensis Jameson & Jakl
–	Punctures of frons and clypeus multisetigerous (at least laterally); parameres not as in Fig. 71	3
3	Smaller protarsal claw deeply arcuate (Fig. 54); parameres as in Fig. 59	Peltonotus deltamentum Jameson & Wada
–	Smaller protarsal claw simply arched; parameres as in Fig. 70	Peltonotus sisyrus Jameson & Wada
4	Apex of labrum weakly sinuate (Figs 23–24)	5
–	Apex of labrum bi-emarginate (Figs 21–22) to deeply bilobed (Fig. 20)	6
5	Protibia tridentate with well-developed basal tooth (e.g., Fig. 46); apex of clypeus at middle with tubercle (Fig. 23); parameres as in Fig. 66	Peltonotus nasutus Arrow
–	Protibia tridentate with weakly developed basal tooth (e.g., Fig. 49); apex of clypeus lacking tubercle (Fig. 24); parameres as in Fig. 65	Peltonotus morio Burmeister
6	Labrum with apex deeply bilobed (e.g.,Fig. 20)	7
–	Labrum with apex bi-emarginate (Figs 21–22)	10
7	Mala of maxilla with setae thick and strongly flattened (with well developed lamellate setal brush); Borneo, Malaysia, and Sumatra; parameres not as in Fig. 63	8
–	Mala of maxilla with setae not thick and strongly flattened (lacking well developed lamellate setal brush) (Fig. 40); South Vietnam; parameres as in Fig. 63	Peltonotus karubei Muramoto
8	Punctures of frons lacking setae; parameres as in Fig. 57	Peltonotus brunnipennis Benderitter
–	Punctures of frons with dense, velutinous and/or moderately long setae; parameres not as in Fig. 57	9
9	Protarsus with larger claw gracile, subequal at middle and base; maxillary stipes with setae curly at apex (e.g.,Fig. 41); Sarawak	Peltonotus gracilipodus Jameson & Wada
–	Protarsus with larger claw robust, much wider at middle than at base; maxillary stipes with setae straight, not curly at apex; Malaysia (Cameron Highlands)	Peltonotus podocrassus Jameson & Wada
10	Labial palpomere 2 greatly enlarged and dorsoventrally flattened, 2–3 times wider than apical palpomere 1 (Fig. 28)	11
–	Labial palpomere 2 not greatly enlarged and flattened, less than 1.5 times wider than apical palpomere 1 (Fig. 33)	13
11	Maxillary stipes with setae curly at apex (e.g., Fig. 36); parameres not as in Fig. 68	12
–	Maxillary stipes with setae straight, not curly at apex; parameres as in Fig. 68	Peltonotus silvanus Jameson & Wada
12	Elytral color reddish, lighter in color than pronotum and scutellum; punctures of pygidium multisetigerous, setae minute and moderate in length; parameres as in Fig. 64	Peltonotus malayensis Arrow
–	Elytral color castaneous, similar in color to pronotum and scutellum (Fig. 1); punctures of pygidium unisetigerous, setae moderate in length; parameres as in Fig. 56	Peltonotus animus Jameson & Wada
13	Protibia tridentate, basal tooth well developed or weakly developed (Figs 46, 48, 49)	14
–	Protibia bidentate (Fig. 47, 51)	15
14	Protibia with basal tooth well developed (Figs 46, 48), external margin without velutinous setae from middle to near base; parameres as in Fig. 61	Peltonotus fujiokai Jameson & Wada
–	Protibia externally with basal tooth weakly developed (Fig. 49), external margin with velutinous setae from middle to near base; parameres as in Fig. 67	Peltonotus rubripennis Miyake & Yamaya
15	Elytra reddish with castaneous vittae (Figs 18–19); parameres as in Fig. 72	Peltonotus vittatus Arrow
–	Elytra lacking vittae, entirely reddish, castaneous, or black; parameres not as in Fig. 72	16
16	Pronotal basal bead lacking, terminating at basolateral angle; length less than 15.0 mm; parameres as in Fig. 60	Peltonotus favonius Jameson & Wada
–	Pronotal basal bead present, extending beyond basolateral angle (obscured anterior to scutellum); length greater than 17.0 mm; parameres not as in Fig. 60	17
17	Protarsomere 5 with well-developed internoapical protrusion (Fig. 50), lacking weak medial protrusion; region surrounding Mt. Bawang, Kalimantan	Peltonotus adelphosimilis Jameson & Wada
–	Protarsomere 5 lacking internoapical protrusion; weak protrusion at middle (Fig. 53); Sabah	Peltonotus similis Arrow