Length 20.3–18.9 mm, color overall black or castaneous, elytra black or castaneous with or without iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 not enlarged or obviously dorsoventrally flattened, mala lacking lamellate setal brush, maxillary stipes without setae curled at apices, male protibia bidentate, protarsomere 5 of male with internoapical protuberance (Fig. 50), form of parameres (Fig. 55), female epipleuron incised and with rounded emargination (similar to Peltonotus similis, Fig. 86).

Indonesia, Borneo Island (Kalimantan).

Length ~16.5 mm, color overall castaneous, elytra castaneous with weak iridescent bloom (Fig. 1), frons with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 enlarged and dorsoventrally flattened, mala with dense lamellate setal brush (Fig. 36), maxillary stipes with some setae curled at apices (Fig. 36), male protibia tridentate with basal tooth obsolete (Fig. 45), and male parameres (Fig. 56).

Indonesia, Sumatra Island.

Length 14.5–16.9 mm, color overall castaneous, elytra reddish-orange or black with iridescent bloom, head punctate and lacking setae, labrum deeply bi-lobed, mentum rounded in apical half, labial palpomere 2 enlarged and obviously dorsoventrally flattened, mala with lamellate setal brush, maxillary stipes with some setae curled at apices, male protibia tridentate, form of parameres (Fig. 57), female epipleuron incised and with oval emargination (Fig. 73).

Malaysia, Borneo Island (Sabah and Sarawak).

Length 14.5–16.5 mm, color overall castaneous, elytra castaneous suffused with dark red or reddish-brown and iridescent bloom (Figs 2–3), head with some unisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 not enlarged or obviously dorsoventrally flattened, mala lacking lamellate setal brush (Fig. 37), maxillary stipes without setae curled at apices (Fig. 37), male protibia tridentate (Fig. 46), form of parameres (Fig. 58), female epipleuron incised and with rounded emargination (Fig. 74).

Indonesia, Sumatra Island.

Length ~16.6 mm, color overall castaneous, elytra castaneous with weak iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum triangular in apical half (Fig. 25), labial palpomere 2 enlarged and dorsoventrally flattened, mala with dense lamellate setal brush (Fig. 38), maxillary stipes with setae curled at apices (Fig. 38), male protibia tridentate with basal tooth weakly developed, male proclaw strongly arcuate in ventral view (Fig. 54), form of parameres (Fig. 59).

Indonesia, Borneo Island (Kalimantan).

Length ~14.6 mm, color overall black, elytra black or dark reddish brown with iridescent bloom (Fig. 4), head with simple punctures (lacking setae), labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 not enlarged or obviously dorsoventrally flattened, mala lacking lamellate setal brush (Fig. 39), maxillary stipes without setae curled at apices (Fig. 39), male protibia bidentate (Fig. 51), form of parameres (Fig. 60), female epipleuron broadly expanded, weakly convex, extending from base to metacoxa, lacking incised apex (Fig. 75).

Vietnam and Myanmar.

This species is most similar to Peltonotus pruinosus, a species for which only the female holotype is known. Previously, this species was only known from the male holotype specimen from Vietnam.

Length 14.1–14.6 mm, color overall castaneous, elytra reddish-brown with castaneous vittae, reddish-brown, or black with iridescent bloom (Figs 5–8), head with some unisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 not enlarged and not dorsoventrally flattened, mala without dense lamellate setal brush, maxillary stipes without setae curled at apices, male protibia tridentate, form of parameres (Fig. 61), female epipleuron simple, not incised and lacking emargination (Fig. 76).

Indonesia, Borneo Island (Kalimantan); Malaysia, Borneo Island (Sabah).

Length 14.4–16.8 mm, color overall castaneous, elytra castaneous with weak iridescent bloom, head with some multisetigerous punctures, labrum deeply bi-lobed, mentum rounded in apical half (Fig. 26), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 26), mala with lamellate setal brush, maxillary stipes with some setae curled at apices, male protibia bidentate, form of parameres (Fig. 62), female epipleuron incised and with oblong-oval emargination (Fig. 77).

Indonesia, Sumatra Island.

Peltonotus gracilipodus and Peltonotus podocrassus (distributed in peninsular Malaysia) have quite similar male parameres and females have quite similar epipleura, perhaps indicating recent isolation of ancestral populations.

Length 13.4–14.5 mm, overall color black or castaneous, elytra reddish orange or black with iridescent bloom (Fig. 9), head with some multisetigerous punctures, labrum deeply bilobed (Fig. 20), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 40), mala with weak lamellate setal brush (Fig. 40), maxillary stipes without setae curled at apices, male protibia bidentate, form of male parameres (Fig. 63).

Vietnam (southern).

Length 21.3 mm, color overall castaneous, elytral disc brown with iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half (Fig. 27), labial palpomere 2 not enlarged and not obviously dorsoventrally flattened, mala without lamellate setal brush, maxillary stipes without setae curled at apices, female epipleuron simple, not incised and lacking emargination (Fig. 78).

Indonesia, Borneo Island (Kalimantan).

Peltonotus kyojinus is the largest species of Peltonotus.

Length 14.4–17.2 mm, color overall castaneous or black, elytra reddish-brown or black with weak iridescent bloom (Figs 10–11), head with some multisetigerous punctures, labrum bi-emarginate (Fig. 21), mentum rounded in apical half (Fig. 28), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 41), mala with weak lamellate setal brush, maxillary stipes setae curled at apices (Fig. 41), male protibia bidentate (Fig. 47), form of male parameres (Fig. 64), female epipleuron incised and with rounded emargination (Fig. 79).

Brunei; Indonesia, Borneo Island (Kalimantan); Malaysia, Borneo Island (Sarawak).

Length 14.0–18.0 mm, color overall black or castaneous, elytra black or castaneous and shining (Fig. 12), head with unisetigerous punctures, labrum weakly sinuate (Fig. 24), mentum quadrate in apical half, labial palpomere 2 not enlarged and not dorsoventrally flattened, mala lacking lamellate setal brush, maxillary stipes without setae curled at apices, male protibia tridentate with basal tooth weakly developed, form of male parameres (Fig. 65), female epipleuron weakly, quadrately incised (Fig. 80) and with moderately developed dorsal pillow.

(Fig. 92). Bhutan, India (northeastern), Myanmar, Nepal, Thailand, Vietnam.

Length ~11.8 mm, overall color castaneous, elytral disc orangish-tan with castaneous maculae and iridescent bloom (Fig. 13), head with some unisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 not enlarged or obviously dorsoventrally flattened, mala lacking lamellate setal brush (Fig. 42), maxillary stipes without setae curled at apices (Fig. 42), female epipleuron simple, not expanded (Fig. 81).

Malaysia, Borneo Island (Sabah).

Peltonotus mushiyaus is the smallest species in the genus. We hypothesize that males of this species will possess orangish-tan elytra with castaneous maculae, similar to males of Peltonotus vittatus.

Length 19.6–20.6 mm, color overall black or castaneous, elytra black or castaneous and shining (Fig. 14–15), head with unisetigerous punctures and apex of clypeus with weak tubercle medially (Fig. 23), labrum weakly sinuate (Fig. 23), mentum quadrate in apical half (Fig. 30), labial palpomere 2 not enlarged and not dorsoventrally flattened, mala lacking lamellate setal brush, maxillary stipes without setae curled at apices, male protibia tridentate with well developed basal tooth, male protibial claw greatly enlarged (Fig. 52), form of male parameres (Fig. 66), female epipleuron weakly, quadrately incised (Fig. 82) and with well developed dorsal pillow.

(Fig. 92). Cambodia, China (southern), Laos, Myanmar, Thailand, Vietnam.

Peltonotus nasutus is the most common species in the genus and the only species with an apicomedial tubercle on the clypeus (male only).

Length ~13.7 mm, color overall black, elytra black with iridescent bloom, head with unisetigerous punctures or lacking setae, labrum bi-emarginate, mentum rounded in apical half (Fig. 31), labial palpomere 2 greatly enlarged and dorsoventrally flattened, mala with lamellate setal brush, maxillary stipes without setae curled at apices, female epipleuron simple, not incised (Fig. 83).

Malaysia, Borneo Island (Sabah).

Length 17.6–18.7 mm, color overall castaneous, elytra castaneous with weak iridescent bloom, head with some multisetigerous punctures, labrum deeply bi-lobed, mentum rounded in apical half (Fig. 29), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 29), mala with lamellate setal brush, maxillary stipes lacking setae curled at apices, male protibia bidentate, form of parameres (Fig. 62), female epipleuron incised and with oblong-oval emargination (Fig. 77).

Malaysia (Peninsular Malaysia).

Peltonotus podocrassus and Peltonotus gracilipodus (distributed in Sumatra) are similar with respect to the male parameres and female epipleura. This may be indicative of recent divergence from a common ancestor.

Length ~15.7 mm, color overall black, elytra black with iridescent bloom, head punctate and lacking setae, labrum bi-emarginate, mentum rounded in apical half and moderately bi-lobed at middle (Fig. 32), labial palpomere 2 not enlarged and not obviously dorsoventrally flattened (Fig. 32), mala without lamellate setal brush, maxillary stipes without setae curled at apices, female epipleuron broadly expanded and lacking emargination at apex (Fig. 84).

India.

Length 12.0–12.5 mm, color overall castaneous, elytral disc brown with iridescent bloom, head with unisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 slightly enlarged and not obviously dorsoventrally flattened, mala lacking lamellate setal brush, maxillary stipes lacking setae curled at apices, male protibia tridentate with basal tooth weakly developed (Fig. 49), form of parameres (Fig. 67), female epipleuron simple and lacking emargination at apex (Fig. 85).

Malaysia, Borneo Island (Sabah and Sarawak).

Length 16.3–17.8 mm, color overall castaneous, elytra castaneous, dark-brown, or black with weak iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 enlarged and obviously dorsoventrally flattened, mala with lamellate setal brush, maxillary stipes lacking setae curled at apices, male protarsomeres 2–4 with apices expanded, male protibia bidentate, form of parameres (Fig. 68), female epipleuron incised and with oblong-oval emargination (Fig. 77).

Indonesia, Borneo Island (Kalimantan); Malaysia, Borneo Island (Sarawak).

Length 18.0–20.9 mm, color overall dark brown or black, elytra dark brown or black with or without iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half (Fig. 33), labial palpomere 2 slightly enlarged and not obviously dorsoventrally flattened (Fig. 33), mala without lamellate setal brush, maxillary stipes without setae curled at apices, protarsomere 5 of male with internomedial protuberance (Fig. 53), male protibia bidentate, form of parameres (Fig. 69), female epipleuron incised and with rounded emargination (Fig. 86).

Malaysia, Borneo Island (Sabah).

Length 16.1–16.4 mm, overall castaneous, elytra castaneous with weak iridescent bloom, head with some punctures multisetigerous, labrum bi-emarginate, mentum triangular in apical half (Fig. 34), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 34), mala with lamellate setal brush, maxillary stipes without setae curled at apices, male protibia bidentate, form of parameres (Fig. 70), female epipleuron incised and with broad, elongate emargination (Fig. 87).

Indonesia, Sumatra Island.

Length 16.9–18.0 mm, color overall black, elytra black with iridescent bloom, head with some multisetigerous punctures, labrum bi-emarginate, mentum rounded in apical half, labial palpomere 2 enlarged and obviously dorsoventrally flattened, mala with lamellate setal brush, maxillary stipes with some setae weakly curled at apices, female epipleuron incised and with oblong-oval emargination (Fig. 88).

Indonesia, Borneo Island (Kalimantan); Malaysia, Borneo Island (Sarawak).

Length 14.1–15.2 mm, color overall castaneous, elytra castaneous or with weak reddish tones and lacking iridescent bloom (Fig. 16), head with some punctures unisetigerous, labrum bi-emarginate, mentum triangular in apical half (Fig. 35), labial palpomere 2 enlarged and obviously dorsoventrally flattened (Fig. 35), mala with lamellate setal brush (Fig. 43), maxillary stipes without setae curled at apices (Fig. 43), male protibia tridentate (Fig. 48), form of parameres (Fig. 71), female epipleuron simple, not incised (Fig. 89).

Indonesia, Sumatra Island.

Length ~13.7 mm, overall color black or castaneous, elytra reddish-brown with weak iridescent bloom (Fig. 17), head with some punctures multisetigerous, labrum bi-emarginate, labial palpomere 2 enlarged and dorsoventrally flattened, mala with well developed lamellate setal brush (Fig. 44), maxillary stipes without setae curled at apices (Fig. 44), female epipleuron incised with a round or oval emargination (Fig. 90).

Thailand.

We hypothesize that males of this species will possess reddish-brown elytra, similar to the coloration of the female.

Length 12.3–14.4 mm, color overall black or castaneous with pronotum reddish or black and with dark discal maculae, elytra reddish and with dark discal maculae and iridescent bloom (Figs 18–19), head with some multisetigerous punctures, labrum bi-emarginate (Fig. 22), mentum rounded in apical half, labial palpomere 2 not enlarged and not obviously dorsoventrally flattened, mala without lamellate setal brush, maxillary stipes without setae curled at apices, male protibia bidentate (or tridentate with basal tooth weakly developed), form of parameres (Fig. 72), female epipleuron narrowly incised (Fig. 91) with well developed dorsal pillow.

Malaysia, Borneo Island (Sabah and Sarawak).