Osirinus ruficrus, Melo & Zanella, 2003

Melo, Gabriel A. R. & Zanella, Fernando C. V., 2003, The species of the parasitic bee genus Osirinus (Hymenoptera, Apidae), Journal of Natural History 37 (24), pp. 2919-2929 : 2924-2926

Osirinus ruficrus , new species

( figures 6–10 )

Comments

This species can be easily recognized by its completely black body and wings and contrasting red legs. It resembles O. leminiscatus in its large body size and predominantly black integument, but the reduced pubescence, metapostnotum lacking a basal depression and short 1st flagellomere suggest the other species of Osirinus . It is currently known from only three specimens, all from the state of Minas Gerais, in south-eastern Brazil. The male holotype and the female paratype have similar body size, while the male paratype is somewhat smaller (body length: 8.5 mm; maximum head width: 2.48 mm; forewing length: 7.5 mm). The male paratype mandibles were opened and it could be observed that its labrum possesses eight small preapical denticles. The genitalia, S7 and S8 of this specimen are depicted in figures 6–10 , respectively.

Description

Holotype male. Body length: 11 mm; maximum head width: 2.56 mm; forewing length: 9.0 mm. Colour: predominantly black; trochanters, femora basally, last tarsomeres, apical marginal zone of T6, entire T7, S2–4 dark brown to brown; mouthparts, remainder of legs, S5 and S6 bright reddish brown; wing veins, including pterostigma, black, membrane strongly infuscate, except for narrow hyaline areas along flexion lines within submarginal and cubital cells, as well as along 2m-cu and 3rs-m. Pubescence: ferruginous on reddish brown areas and brown to light brown on areas with dark integument, except for black setae covering wings. Dense and finely plumose on labrum, middle and lower paraocular areas, gena, posterior portion of pronotal lobes and outer surface of mid and hind tibiae; on remainder of body, mostly sparse and simple or only with few branches. Disc of mesoscutum uniformly covered with short, mostly simple, erect setae, branched setae restricted to medial portion anteriorly and corners posteriorly. Lateral surface of mesepisternum with sparse and relatively long setae, longest setae about 1.3–1.4 × as long as length of 2nd flagellomere. Setae on central portion of metanotum distinctly shorter than those on lateral portions. Metapostnotum completely glabrous. Entire outer surface of hindtibia with numerous strong, downward-curved bristles among the plumose setae. T1 almost glabrous, with very sparse and short setae along posterior marginal zone, and longer setae on ventral portions; disc of T2–5 uniformly covered with short and relatively sparse pubescence, distance between setigerous punctures about one setal length; ventral portion of T2–4, posterior discal margin of T5–6 and S2–5, sides of T7, and exposed portion of S6 with long, simple, reddish brown setae; posterior apical margin of S5 with distinct fringe of long, plumose, reddish brown setae. Integumental surface: predominantly very smooth and shiny; setigerous punctures very fine, except for a few strong punctures on clypeus and for those on lateral surface of mesepisternum. Metapostnotum smooth, without a basal depression. Structure (measurements in mm): head about 1.2 × wider than long (2.56:2.16); inner orbits weakly convex and slightly diverging below (upper to lower interorbital distance, 1.54:1.62); eye 2 × as long as its maximum width (1.58:0.78); mandible about 2.9 × longer than its outer basal width (1.32:0.46); clypeus 2.2 × wider than long (1.54:0.7). First flagellomere about 0.6 × as long as 2nd (0.2:0.34). Labial palpus five-segmented, apical segment minute. Apical portion of foretibial spur (apical to velum) longer than half the length of basal portion (0.24:0.34); hind tibia, in posterior view, about 3.4 × longer than wide (2.0:0.58). Forewing M and Cu diverging slightly basal to cu-a; proportion of lengths of submarginal cells on posterior margin 0.9:1:1.2 (0.68:0.74:0.88). Mesoscutum about as wide as long (1.70:1.66). Pygidial plate well developed, narrowly truncate apically, and with translucent lateral and apical margins.

Paratype female. Body length: 11.5 mm; maximum head width: 2.96 mm; forewing length: 9.0 mm. Agreeing with male, except for: S5 dark brown, its posterior marginal zone densely covered with long, reddish brown, simple setae; setae on exposed portion of S6 very short, except on its apex; metaposnotum with a few very fine, oblique rugulae basally; head about 1.3 × wider than long (2.96:2.24); inner orbits straight (upper to lower interorbital distance, 1.7:1.7); eye about 1.8 × as long as its maximum width (1.74:0.94); mandible almost 3.0 × longer than its outer basal width (1.54:0.52); clypeus 2.3 × wider than long (1.68:0.72); 1st flagellomere about 0.5 × as long as 2nd (0.16:0.34); proportion of lengths of submarginal cells on posterior margin 1:1:1.3 (0.72:0.72:0.92); pygidial plate broad, lateral margins forming a 40 ° angle, apex narrowly rounded.

Type material

Brazil, Minas Gerais: Holotype male ( DZMG), ‘ Brasilaņdia de Minas MG, Brasil 22/03/1999, D. A. Simão’ and ‘ Abelhas — Cerrado, Mannesmann, Fazenda Brejão, 3133-9144 ’. Paratypes: one female ( DZUP), ‘N°, H., Planta, voando’ and ‘Lavras Novas—Ouro Preto, MG — Brasil 12/XI/1995, 20 ° 28 ∞ 22 S—43 ° 33 ∞ 4 W, Faria, G.M., Melo, M.A., Daniel, A.M., Paiva, G. ’; one male ( DZUP), same data except ‘N° 050250, H. 12:00-14:00, Planta 069’ and ‘ 11/XI/1995 ’.

Etymology This species is named for its red legs, from the Latin rufus, red plus crus, leg.

Figures

FIGS 6–17. (6–10) Osirinus ruficrus, sp. n.: male, lateral (6), dorsal (7) and ventral view of genitalia (8); ventral view of sterna VII (9) and VIII (10). (11–15) Osirinus santiagoi: male, lateral (11), dorsal (12) and ventral view of genitalia (13); ventral view of sterna VII (14) and VIII (15). (16) Osirinus parvicollis: female, frontal view of head. (17) Osirinus rutilans: female, frontal view of head.