Andringitrabius polymitus Hustache, 1956

Borovec, Roman, 2025, Two new and one enigmatic genus of Oosomini from South Africa with description of seven new species (Coleoptera: Curculionidae: Entiminae), Zootaxa 5642 (2), pp. 101-126 : 104-105

Andringitrabius polymitus Hustache, 1956

Figs (1, 2, 13, 14)

Andringitrabius polymitus Hustache, 1956: 73 (original description); Alonso-Zarazaga & Lyal 1999: 187 (catalogue).

Type locality. Madagascar, Andringitra .

Type material. Holotype: unsexed spec.,Andringitra, Madagascar [printed] / TYPE [printed, red ink] / Museum Paris, 1949, Col. A. Hustache [printed, blue label] / Andringitrabius polymitus m. [handwritten] ( MNHN) ( Fig. 2 ).

Redescription. Body length 3.2 mm. Body ( Fig. 1 ) black, antennae and legs reddish brown, clubs darker. Appressed scales on elytra regularly rounded, isolated, 3–4 across width of one interstria; interstriae 3 with slightly wider, paler scales. Pronotum with dense greyish appressed rounded scales, as large as grey elytral scales on interstriae 3, leaving wide median longitudinal stripe glabrous. Head including rostrum with same scales with metallic sheen as those on elytra. Each interstria with one inconspicuous row of short, semi-erect setae, about as long as half the width of one interstria; setae slender, almost piliform. Pronotum and head with rostrum with very short semi-erect setae, hardly visible in lateral view.

Rostrum ( Figs 13, 14 ) 1.15× as wide as long, at base 1.22× as wide as at apex, evenly tapered apicad with slightly concave sides. Epifrons narrow, with concave sides, at base 0.5× as wide as rostrum in relevant part, dorsally with longitudinal furrow. Frons large, posteriorly reaching antennal insertions, slightly domed, smooth. Eyes in dorsal view hardly prominent from outline of head.

Antennal scape 6.4× as long as wide at apex, in apical part 0.8× as wide as club. Funicle with article 1 1.5× as long as wide and 1.1× as long as article 2, this is 1.6× as long as wide; articles 3 and 4 1.2× as long as wide; articles 5 and 6 isodiametric, article 6 slightly larger than 5; article 7 1.3× as wide as long; clubs 1.9× as long as wide.

Pronotum ( Fig. 1 ) 1.29× as wide as long, widest at midlength, with weakly rounded sides, behind anterior margin slightly constricted, with anterior margin only slightly narrower than posterior one; disc regularly domed, finely, densely, regularly punctured; pronotum in lateral view almost flat.

Elytra ( Fig. 1 ) oval, 1.37× as long as wide, widest slightly before midlength, with slightly rounded sides, apically narrowly tapered; striae punctured.

Tibiae slender, 7.8× as long as width at midlength; protibiae apically rounded, fringed with short and fine setae, finely denticulate in apical half on inner margin, mucronate. Tarsi with tarsomere 2 1.3× as wide as long; tarsomere 3 1.4× as wide as long and 1.4× as wide as tarsomere 2; onychium 1.3× as long as tarsomere 3.

Biology. Unknown.

Distribution. Madagascar.

Remarks. I was able to examine the holotype of this species in the Paris Museum without being able to borrow the type specimen or to dissect it. Thus, the redescription of the species lacks characters on the ventral part of the body and also characters of the genitalia.

Figures

FIGURES 1–4. Dorsal habitus. 1. Andringitrabius polymitus. 2. Holotype labels of Andringitrabius. 3. Bulirschius densatus. 4. B. dysommatiformis. Not to scale.

FIGURES 13–24. 13–24: Head including rostrum in dorsal and lateral view. 13, 14. Andringitrabius polymitus. 15, 16. Bulirschius densatus. 17, 18. B. dysommatiformis. 19, 20. B. inconspicuus. 21, 22. B. ruiterbos. 23, 24. B. tesinskyi. Scale 0.50 mm.