Myosoma rubriventre BRULLE 1846

Myosoma rubriventre BRULLÉ

(Figs 84–93)

Myosoma rubriventre BRULLÉ, 1846: 452 (1 ♀), type locality: “le Brésil ”, female holotype (present designation) in Muséum National d’Histoire Naturelle, Paris; examined. – SHENEFELT 1978: 1709 (literature up to 1904).

Designation of the female holotype of Myosoma rubriventre – (First label, printed) “Museum Paris / EY0000001664”; (second label) “Museum Paris” (printed) / “ Brésil / Dalalande” (handwriting); (third round label, handwriting) “ Brésil / Delalande”; (fourth label, handwriting) “ Myosoma / rubriventre ”; fifth label is the holotype card. – Holotype is in fairly poor condition: (1) pinned by mesosoma on a short and thick pin; (2) right flagellum missing, left flagellum apically deficient; (3) fore pair of legs (except left coxa) glued on a separate small card; (4) left hind leg (except coxa and trochanters) missing; (5) head and mesosoma (and partly legs) dirty.

Redescription of the female holotype – Body 6 mm long. Scape short, dorsally longer than ventrally and as long dorsally as broad apically (Fig. 84). Left flagellum deficient distally and with 28 flagellomeres. First 3–4 flagellomeres shortening, rest of flagellomeres transverse. – Head in dorsal view transverse (Fig. 85), 1.7 times as broad as long, eye 1.7 times longer than temple, temple rounded. Ocelli middle-sized, almost round, OOL 3.5 times longer than POL. Eye in lateral view 1.3 times as high as wide and just less than twice wider than temple, temple evenly broad beyond eye (Fig. 86, see arrows). Oral opening large, twice longer horizontally than shortest distance between opening and eye. Head polished.

Mesosoma in lateral view 1.6 times as long as high, polished. Notaulix faintly distinct. – Hind femur 4.3 times as long as broad, parallel-sided, together with hind tibia with relatively short hairs (Fig. 87). Hind basitarsus as long as tarsomeres 2–4 combined. Claw as in Fig. 88.

Fore wing one-fourth longer than body. Pterostigma (Fig. 89) 3.2 times as long as wide and issuing r just distally from its middle; r shorter than width of pterostigma. Second submarginal cell less long, 3–SR 1.65 times as long as 2–SR; SR1 1.5 times longer than 3–SR, indistinctly bent and approaching tip of wing. First discal cell less long and rather wide, 1–SR–M bent and 1.7 times as long as 1–M (Fig. 90). – Hind wing: 1r–m curved as in Fig. 73.

First tergite (Fig. 91) twice longer than broad behind, scutum clearly widening posteriorly, i.e. margin laterally from scutum narrow. Second tergite 3.5 times as broad behind as long medially, laterally narrowing. Third tergite slightly longer than second tergite (Fig. 91). Tergites polished. Ovipositor sheath as long as hind tibia + half basitarsus.

Antenna, head, mesosoma and legs black, metasoma reddish. Wings brown fumous, pterostigma and veins blackish brown.

Description of the male (1 ♂: Peru, Pachitea, in Museum Budapest) – Similar to the female. Body 6 mm long. Antennae deficient: left flagellum missing, right flagellum with 24 antennomeres. Fore wing: pterostigma issuing r from its middle, 3–SR 1.5 times as long as 2–SR. First discal cell slightly narrower: 1–SR–M twice as long as 1–M (Fig. 92). Scutum of first tergite less widening posteriorly (Fig. 93). Metasoma reddish, its ultimate two tergites black.

Host unknown.

Distribution – Brazil, Peru.

Taxonomic position – Myosoma rubriventre is nearest to M. lagopus (KRIECHBAUMER), for their distinction see key-couplets 8 (9)–9 (8).