Mesosaimia mausoni ( Breuning, 1950 ) Breuning, 1950

Yamasako, Junsuke, 2014, Review of the genus Mesosaimia Breuning with description of a new species (Coleoptera: Cerambycidae: Lamiinae: Mesosini), Zootaxa 3852 (4), pp. 461-474 : 467-472

Mesosaimia mausoni ( Breuning, 1950) comb. nov.

( Figs 10–11 , 20 , Pl. 1)

Trichipocregyes mausoni Breuning, 1950: 521 ,

type locality: Vietnam, Lang Son Prov., Mt. Mauson .

Type material examined. Holotype ( MHNL, Figs 10–11 , 20 ): ♀, " Mt. Mauson ", “ Trichipocregyes / mausoni / mihi Typ/ Breuning det.”, “TYPE”, “ Trichipocregyes / mausoni Br. / P. Lepesme det.”.

Differential diagnosis. This species (female) is very similar to M. robusta but distinguishable by the following characteristics: elytra mottled mainly by dark brown and orange-brown pubescence; pronotal swelling indistinct; elytra without distinct granules on base, with rudimentary basal swellings. It is also similar to M. similis , but different in the followings: elytra mottled mainly by dark brown and orange-brown pubescence; antennae slightly longer than body length; pronotum roundly expanded laterally, with pair of rudimentary swellings on disk.

Redescription. Female (n = 1, Figs 10–11 , 20 ): Length from vertex to the apex of abdominal segment 17.4 mm, width across humeri 6.8 mm.

Body black except antennae and legs reddish brown; head, pronotum and elytra with mottled black, dark brown, orange-brown and white pubescence of which orange and white ones form small spots sparsely scattered throughout; ventral surface with mottled dark brown and orange-brown pubescence. Antennae with scape and pedicel with dark brown pubescence; antennomeres 3–11 annulate with white pubescence on each basal part and the remainders with dark brown pubescence. Legs with femora and tibiae sparsely clothed with dark brown pubescence, annulate with orange brown pubescence on each middle; tarsi with tarsomeres 1–2 with same pubescence; tarsomere 3 and claw with dark brown pubescence.

Head with frons having sparse, shallow and fine punctures; upper and lower eye lobes connected by single row of ommatidia; lower eye lobe 1.2 times as long as width, 0.8 times as long as gena. Antennae 1.1 times as long as body length, surpassing elytral apices near apex of antennomere 10; scape to antennomere 5 sparsely fringed beneath by suberect setae; antennomere 11 conical shaped; relative length of each segment as follows: 1.9: 0.3: 2.5: 1.7: 0.9: 0.7: 0.5: 0.4: 0.4: 0.4: 0.4. Pronotum roundly expanded laterally, widest near middle, 0.8 times as long as width, 0.7 times as wide as elytral base; disk with pair of rudimentary swellings, with sparse and fine punctures. Elytra 0.6 times as long as body length, 1.6 times as long as humeral width, with a few indistinct granules on base, rudimentarily swollen longitudinally near middle behind base, with sparse punctures distinct in basal half, reduced apically and almost disappearing in apical 1/5; sides almost straight toward apical 1/3, arcuately rounded apically; apex rounded with sub-quadrate inner angle.

Distribution (Pl. 1). Vietnam (Known only from the type locality, Mt. Mauson, Lang Son Prov.)

Taxonomical notes. Only the holotype of this species was available for this study.

Breuning (1950) described this species under the new genus Trichipocregyes on the basis of a single female specimen from “Monts Mauson, Tonkin ”, and defined the genus mainly by the following characteristics: eye deeply emarginate but nearly subdivided; lower eye lobe longitudinal; prosternal process roundly sloped in lateral view; mesosternal process with pair of tubercles, truncated in lateral view; elytra without distinct swellings near base. However, these diagnostic characters show no significant differences with Mesosaimia , and this species well shares generic features with M. robusta and M. similis com. nov. Therefore, with this justification, Trichipocregyes is a new synonym of Mesosaimia .

Figures

FIGURES 9 – 15. Habitus of Mesosaimia spp. 9. Mesosaimia similis (male, holotype); 10 – 11. M. mausoni (female, holotype); 12 – 13. M. wakaharai (male, holotype); 14 – 15. ditto (female, paratype); 9, 10, 12, 14. dorsal view; 11, 13, 15. lateral view.

FIGURES 16 – 22. Frontal views of Mesosaimia spp. 16 – 17. Mesosaimia robusta; 18 – 19. M. similis; 20. M. mausoni; 21 – 22. M. wakaharai; 16, 18, 21. male; 17, 19, 20, 22. female; 16. lectotype, 17. paralectotype, 20, 21. holotype; 22. paratype.