Onthophagus hollowayi Krikken & Huijbregts

Krikken, J. & Huijbregts, J., 2017, Sulawesi Onthophagus: seven new species in select groups (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 4238 (3), pp. 301-334 : 325-326

Onthophagus hollowayi Krikken & Huijbregts , new species

( Figs. 11 , 29 , 62 –67)

Material examined. Holotype male ( BMNH) from Indonesia: North Sulawesi: Dumoga Bone National Park: Plot A, 24–26.ii.1985 Project Wallace; flight interception trap, lowland forest, approximately 200 m, B.M. 1985-10. The 5 paratypes are summarized below:

NORTH SULAWESI: DUMOGA BONE NATIONAL PARK

- Malibagu Rd 110m, 14-19.xi.1985, J. Krikken, pw38b, multistratal evergreen forest edge, 2 fish traps, 1 in RMNH

- Plot A, 200 m, 13–20.iii.1985, lowland rain forest, flight interception trap, 1 in BMNH

- Plot A, 200 m, 30.xi–06.xii.1985, lowland rain forest, flight interception trap, 1 in BMNH

- Plot D, 400 m, 06–13.ii.1985, lowland rainforest, flight interception trap, 1 in BMNH

- Toraut R 3, 245 m, 27–31.v.1985, J. Huijbregts, hh343, multistratal evergreen forest, 4 fungi traps, 1 in RMNH

Description. Holotype, male. Body length approximately 4.8 mm. Colour black-brown, almost entirely shiny. Pilosity pale yellow, dorsal side virtually glabrous (with microstubbles).

Clypeal apex medially produced into short, reflexed lobe, apex truncate; clypeogenal transition nearly continuous at boder; clypeofrontal ridge arcuate, obsolescent; clypeal surface finely, distinctly punctate, except for somewhat smooth anterior part; rest of cephalic surface abundantly, evenly punctate; punctures separated by 1–3 times their diameter. Vertex slightly elevated, somewhat callose medially. Eyes with approximately 8 facet rows across widest point; ratio interocular distance / single maximum eye width approximately 8.

Pronotum moderately convex, with anteromedian pair of slight approximated callosities (more distinct in profile); discal midline not impressed; anterior section of lateral border virtually straight; anterolateral angle weakly round, approximately 85°; sides in dorsal view more strongly round halfway their length; posterior section of lateral border distinctly sinuate, posterolateral angles obtuse; base finely marginate (x60); entire pronotal derm with abundant punctation; punctures simple, separated by 1–4 diameters.

Elytral striae discally well defined, with distinct punctures, mainly separated by 3–5 times their diameter, weakly crenulate on interstriae; interstriae slightly convex, with numerous fine, subserially arranged punctures; elytral margins (including epipleuron) narrowly brown.

Antennal club light yellow. Metasternum with vague midline impression, disc with scattered micropunctation, anteromedian lobe abundantly punctate-setose; lateral wings with numerous seta-bearing, ocellate punctures. Abdominal ventrites brown, each with transverse row of seta-bearing, ocellate punctures. Pygidial disc also brown with abundant, distinct seta-bearing punctures; length of setae up to approximately 2 times punctural diameter; base finely marginate (ridge low).

Legs brown. Protibia with 3+(1) larger denticles, spur elongate-acuminate. Mesotibial spurs unmodified; metatibial spur long, distally feebly sinuate, apex truncate. Profemoral underside moderately punctate-setose, mesofemoral and metafemoral undersides with sparse, seta-bearing punctures. Metatarsomere 1 about as longs as metatarsomere 2–4 combined; approximate proportions of spur and tarsomeres 1–5: 13// 11/6/4 /3/6.

Aedeagus, Fig. 66 (holotype).

Measurements in mm. Maximum width of head 1.5. Median length of pronotum 1.7, maximum width 2.5. Sutural length of elytra 2.0, maximum width 2.7.

Variation and sexual dimorphism. Body length 4.4–4.8mm.

Female with same labels as holotype has clypeal margin hardly reflexed, evenly round; clypeal derm rugulate, clypeofrontal ridge arcuate, distinct; medially between eyes with transverse callosity. Pronotal surface anteriorly evenly round, without medially impressed anterior declivity.

Etymology. Named after our colleague Jeremy D. Holloway, who played a role in the organization of Project Wallace 1985 and strongly stimulated our interest in Indo-Australian biogeography with his publications.

Figures

FIGURES 9 – 12. Sulawesi Onthophagus species, oblique habitus. 9, O. begoniophilus, paratype male from Ambang. 10, O. annulopunctatus, paratype male from Mogogonipa. 11, O. hollowayi, holotype male from Dumoga. 12, O. seseba, holotype male from Batui (pygidium up). Scale lines approximately 1 mm.

FIGURES 25 – 30. Sulawesi Onthophagus species, dorsal forebody. 25, O. sopu, holotype male from Sopu. 26, O. sopu, paratype male from Sopu. 27, O. manguliensis, male from Mangoli. 28, O. annulopunctatus, paratype male from Mogogonipa. 29, O. hollowayi, holotype male from Dumoga. 30, O. seseba, holotype male from Batui. Scale lines approximately 1 mm.

FIGURES 56 – 66. Sulawesi Onthophagus body parts. 56, O. annulopunctatus, head full-face, paratype male from Mogogonipa. 57, O. annulopunctatus, left elytron dorsal, paratype male Sanggona. 58, O. annulopunctatus, protibial upper side, paratype male from Mogogonipa. 59, O. annulopunctatus, metatibial upperside, paratype male from Mogogonipa. 60, O. annulopunctatus, aedeagus lateral, paratype male Toraut. 61, O. annulopunctatus, head full-face, paratype female from Marena. 62, O. hollowayi, head full-face, holotype male from Dumoga. 63, O. hollowayi, left elytron dorsal, holotype male from Dumoga. 64, O. hollowayi, protibial upper side, holotype male from Dumoga. 65, O. hollowayi, metatibial upperside, holotype male from Dumoga. 66, O. hollowayi, aedeagus lateral, holotype male from Dumoga. 67, O. hollowayi, head full-face, paratype female from Malibagu. Scale lines approximately 1 mm.