Sebasmia olemehli Miroshnikov, 2022

Miroshnikov, A. I., 2022, The longicorn beetle tribe Cerambycini Latreille, 1802 (Coleoptera: Cerambycidae: Cerambycinae) in the fauna of Asia. 18. The members of the genus Sebasmia Pascoe, 1859 from Sri Lanka, with the descriptions of two new species, Russian Entomological Journal 31 (2), pp. 154-158 : 156-158

Sebasmia olemehli Miroshnikov , sp.n.

Figs 1, 4, 13, 15, 18, 21, 23, 25, 28.

MATERIAL. Holotype, ♂ ( NHMD) ( Fig. 1), Sri Lanka, Western Province, Negombo vic., 16–17.VII.2003, leg. Ole Mehl, “ Sebasmia testacea, O. Mehl det. 2011”.

DIAGNOSIS. Based on male characters, this new species resembles S. ceylonica sp.n., but differs by the presence of a very wide longitudinal area (stripe) of a peculiar shape, covered only with sparse recumbent light setae in the middle part of the pronotal disc, as in Fig. 4 (cf. Fig. 5); the structure of the elytra, including partly the denser recumbent light setation, the smoothened (not rugose) surface, apart from puncturation, the more strongly developed, sharp, sutural tooth, as in Fig. 28 (cf. Fig. 27); the more strongly claviform femora, as in Figs 13, 15, 18 (cf. Figs 12, 14, 17); the peculiar emargination on ventral side of the mesofemora, as in Fig. 13 (cf. Fig. 12); the partly less coarse transverse folds on the prosternum; the more strongly expressed tubercle at the apex of the prosternal process; the distinctly wider mesosternal process; the more gentle puncturation of the metasternum; the structure of the genitalia, as in Figs 21, 23, 25 (cf. Figs 20, 22, 24), including the more elongated parameres, as in Fig. 23 (cf. Fig. 22); the darker coloration of the body, at least dorsally, as in Figs 1, 4 (cf. Figs 2, 5). Sebasmia olemehli sp.n. can also be compared to S. testacea , but is distinguished, as from S. ceylonica sp.n., by the features of the recumbent light setation of the pronotal disc, as in Fig. 4 (cf. Fig. 7); the more strongly expressed tubercle at the apex of the prosternal process; the distinctly wider mesosternal process; the more strongly claviform femora, as in Figs 15, 18 (cf. Figs 16, 19); the denser recumbent light setation of the elytra; the darker coloration of the body; as well as by the coarser sculpture of the pronotal disc; the shape of the apical external angle of the elytra, as in Fig. 28 (cf. Fig. 26); the length ratio of antennomeres 1 and 3; and some other traits.

DESCRIPTION. Male. Body length 18.3 mm, humeral width 3.5 mm. Coloration of integument mainly combines dark reddish brown and reddish brown tones; eyes black; dorsum darkest.

Head with well-developed antennal tubercles; genae short; eyes very large and very strong convex; submentum with rough punctures; neck with transverse folds both ventrally and laterally; antennae nearly reaching the apex of elytra by apex of antennomere 9; length ratio of antennomeres 1–11, 28: 7: 35: 31: 45: 52: 55: 53: 53: 51: 53; antennomere 1 mostly with a rough and coarse, dense, partly confluent

12 26 13 20 27 14 28 15 16 17 21 22 23 18 19 24 25

Figs 12–28. Sebasmia spp. , holotypes: 12, 14, 17, 20, 22, 24, 27 — S. ceylonica sp.n., male; 13, 15, 18, 21, 23, 25, 28 — S. olemehli sp.n., male; 16, 19, 26 — S. testacea , female; 12–13 — left mesofemur, internal view; 14–16 — left mesofemur, external view; 17–19 — left profemur, external view; 20–21 — apical part of penis, ventral view; 22–23 — apical part of tegmen, ventral view; 24–25 — apical part of tergite 8, dorsal view; 26–28 — apex of left elytron.

Рис. 12–28. Sebasmia spp. , голотипы: 12, 14, 17, 20, 22, 24, 27 — S. ceylonica sp.n., самец; 13, 15, 18, 21, 23, 25, 28 — S. olemehli sp.n., самец; 16, 19, 26 — S. testacea , самка; 12–13 — левое среднее бедро с внутренней стороны; 14–16 — левое среднее бедро с наружной стороны; 17–19 — левое переднее бедро с наружной стороны; 20–21 — вершиннаЯ часть пениса сниЗу; 22–23 — вершиннаЯ часть тегмена, сниЗу; 24–25 — вершиннаЯ часть 8-го тергита, сверху; 26–28 — вершина левого надкрыльЯ.

The longicorn beetle tribe Cerambycini in the fauna of Asia 157 puncturation; antennomere 2 subequal in length and width; last antennomere with a distinct appendage.

Pronotum very clearly longitudinal, 1.38 times as long as width; base 1.21 times as wide as apex; with a sharp constriction near apex; with rough and coarse, transverse, partly sinuous folds and with a strong, median, keel-shaped, longitudinal, shiny elevation located mostly in basal half, as in Fig. 4.

Scutellum narrowly and shallowly emarginate at apex.

Elytra strongly elongated, barely narrowed towards apex, 3.45 times as long as humeral width; apical external angle subrectangular, sutural angle with a well-developed sharp tooth; mostly with a very small dense puncturation.

Prosternum mainly with rough transverse folds; prosternal process with a well-expressed apical tubercle; mesosternal process without tubercle dorsally, between coxae about 1.7 times as wide as prosternal process; metasternum with a small dense puncturation; visible abdominal sternites with small dense punctures, this being smaller than on metasternum; last (visible) abdominal sternite with a distinct broad emargination apically; last (visible) abdominal tergite at apex narrowly and clearly emarginate.

Legs relatively short; femora with a carina along each side, this being distinct only in basal part; mesofemora ventrally with emargination and well-developed brush of very dense, light, partly yellowish setae, as in Fig. 13, characteristic of the genus; metatarsomere 1 slightly shorter than metatarsomeres 2 and 3 combined.

Recumbent setation mostly silvery greyish, densest mainly on head dorsally, partly on pronotal disc and base of elytra, as in Figs 1, 4.

Genitalia in Figs 21, 23, 25.

ETYMOLOGY. This new species is dedicated to the memory of Ole Mehl (1948–2015), a remarkable Danish coleopterologist and connoisseur of longicorn beetles, who collected a rich and very valuable collection of this family, especially from the Oriental Region, now kept in NHMD.

DISTRIBUTION. Sri Lanka.