Erymanthus bicolor Chapin, 1924

Gerstmeier, Roland & Salvamoser, Max, 2014, Revision of the checkered beetle genus Erymanthus Spinola, 1841 (Coleoptera, Cleridae, Clerinae), Zootaxa 3755 (6), pp. 501-548 : 510-511

Erymanthus bicolor Chapin, 1924

( Figs 12–13 , 39 C)

Chapin 1924: 2.

Erymanthus concoloripennis Pic, 1932: 5 n. syn. Pic 1932: 5; Pic 1933: 116.

Specimens examined: Erymanthus bicolor : Type material unavailable.

Erymanthus concoloripennis : Lectotype (designated here): Musée de Congo, Sankuru: Komi, 28.III.1930, J. Ghesquière, Erymanthus concoloripennis mp, R. Det. DD 2224, Type, Holotype, Erymanthus bicolor Chap., Syn. Nov. J. J. Menier 1981 ( MRAC).

Comment on type specimen: Erymanthus bicolor: Chapin lists a single type specimen (AMNH Type 28080) in his description of E. bicolor , it therefore (although we have not examined it) qualified as the Holotype, fixed by monotypy (ICZN 1999: Article 73.1.2). Erymanthus concoloripennis: As Pic makes no mention of type specimens, all E. concoloripennis type material are considered syntypes (ICZN 1999: Article 73.2) and available for lectotype designation (ICZN 1999: Article 74.1).

Others: Muséum Paris, Congo belge centr., Maniema: Kindu, L. Burgeon 1917, Individu bcp + grand que type, E. bicolor Chapin, Comparé au type par Jean J. Menier 1981 - Type á New York Amer. Mus. nat. Hist. (MNHN). Musée du Congo, Lulua, Kapanga, IV. 1933, G. F. Overlaet, R. Det. H 3312, Erymanthus bicolor Chap. (MRAC). Musée du Congo, Kafakumba, XI. 1933, G. F. Overlaet, R. Det. S. 5492, desiré, Erymanthus bicolor Chap. (MRAC). Gumba, 11.XI.27, A. Collart, det. Corporaal 1941, Erymanthus bicolor Chapin, Coll. R. I. Sc. N. B. (ISNB).

Diagnosis: Erymanthus bicolor can easily be confused with E. diversipes , primarily because of their very similar coloration. Erymanthus diversipes only has the tibiae dark blue, antennomeres 1–2 orange and antennomeres 3–11metallic blue. Specimens of E. bicolor can be recognized by their orange anterior legs and orange antennae. Erymanthus concoloripennis is treated as a synonym because we observed no differences in external morphology or genitalia.

Length: (5 specimens measured) 13–16mm (average 14.6mm).

Head: Orange; antennae yellow to orange; frontal umbo with two grooves; with anteriorly directed flavous pilosity.

Pronotum: Pronotal length to width ratio 1.05:1 to 1.18:1 (average 1.11:1); orange, prebasal depression and pronotal collar laterally dark; gibbosities inconspicuous; pronotal groove quite deep; with quite dense fine punctation; with relatively dense dark and white pilosity.

Scutellum: Black; vested with black setae.

Elytra: Elytral length to width ratio 1.90:1 to 2.09:1 (average 2.00:1); nitid; with dense punctation, apical part with many gibbosities; first 2–4 rows of punctation slightly rasp-like; punctation basally fine and circular, in distinct rows, interstices smaller than diameter of punctation, apically coarse, elongate-ovate, irregularly distributed, interstices up to double diameter of punctation; posterior part with dense black and white pilosity; gibbosities A, B, C and D with dense fine punctation (sometimes with white setal tuft), E with black setae.

Legs: Prothoracic legs orange, tibiae slightly darker, tarsi black; other legs completely black.

Lower surface: Prothorax pale, remainder black, sometimes with light spots laterally on each abdominal segment.

Male genitalia, pygidium, ventrite VI: Tips of tegminal lobes pointed, tegminal lobes one-seventh length of tegmen; tegminal struts broadened at base, broadened even more after one-ninth length and tapering after onefourth lanceolate; phallic tip clavate; posterior side of pygidium almost round; processes of ventrite VI almost round.

Distribution: DR Congo.

Seasonal occurrence: Collected from November to April.

Figures

FIGURE 12. Erymanthus bicolor: (A) Aedeagus ventral, (B) Phallus lateral, (C) Tegmen dorsal, (D) Spicular fork, (E) Pygidium, (F) Ventrite VI; (scale bar 1 mm).

FIGURE 13. Distribution of Erymanthus bicolor.

FIGURE 39. (A) Erymanthus ater, (B) Erymanthus belzebuth, (C) Erymanthus bicolor, (D) Erymanthus diversipes, (E) Erymanthus flavonotatus, Lectotype, (F) Erymanthus gemmatus; (scale bars 5 mm).