Plumarius obscurus Diez & Roig-Alsina

Diez, Patricia A. & Roig-Alsina, Arturo, 2016, Revision of Plumarius Philippi 1873 (Hymenoptera: Chrysidoidea, Plumariidae) from Argentina north of Patagonia, with description of eighteen new species, Zootaxa 4098 (3), pp. 442-470 : 464-465

Plumarius obscurus Diez & Roig-Alsina , sp. nov.

( Figs 17 A–D)

Diagnosis. This species is related to P. mikrommatus sp. nov. by the apically narrowed marginal cell. It differs by the larger ocelli, which are separated from the eye by an OOD 1.8 × their maximum diameter.

Description. Holotype, ♂. Total length 4.9 mm (paratypes 5.4–6.8 mm). Color. Dark brown, with lighter antenna, legs and metasoma.

Head. 1.1 × wider than high in frontal view; in dorsal view width subequal than width of scutum between tegulae (4.9:5.0). OOD 1.6 × diameter of lateral ocellus; POD 1.4 × OOD. Antennocular distance 1.0 × diameter of torulus; interantennal distance 2.8 × antennocular distance. Vertex finely reticulated, scarcely punctate between lateral ocelli. Torulus closer to lateral ocellus than to clypeus (2.8:4.2). Lateral ocelli in frontal view below upper margin of head. Median ocellus above supra-torular line ( Fig. 17 A). Genal carina present, distinct. Length of area between preoccipital carina and suboral swelling shorter than length of suboral swelling (1.0:2.1); this area without a median longitudinal carina; lower area of genal bridge close to mandibular articulation with carinae, without punctures ( Fig. 17 B). Malar area longer than apical width of F1 (1.0:0.6), weakly striate anteriorly. Supraclypeal area with lateral striae; rounded in lateral view ( Fig. 17 C). Epistomal suture evident. Clypeus 1.4 × wider than high, with lateral striae; rounded in lateral view; not truncate. Proportion of lengths of segments of maxillary palp, from base to apex: 8:7:14:16:11:11. Scape without swelling or projection. F1 6.0 × as long as its apical width, subequal to scape and pedicel combined (3.6:3.4).

Mesosoma . Area anterior to pronotal lobe smooth; pronotal lateral carina distinct, forming lower pocket. Notaulus weakly marked, as long as admedian line. Anterior surface of scutum densely punctate. Propleuron moderately punctate, mesopleuron scarcely punctate. Metapostnotum with striae reaching posterior margin. Propodeum transverse, swollen behind spiracle, without carina anterior to spiracle. Fore wing: marginal cell with anterior margin 2.7 × as long as posterior margin; length of vein Rs3 subequal to Rs4 (1.9:1.8); vein M separated from vein cu-a by 0.3 × length of cu-a; discal cell rectangular. Hind wing: veins M and cu-a interstitial. Protarsomere 1with one outer lateral spine. Length of mesotarsomere 1 shorter than metatarsomere 1 (2.3:3.2); inner metatibial spur 3.1 × as long as outer spur.

Metasoma. T7 apically rounded. Genitalia as in Fig. 17 D.

Examined material. Holotype, ♂: ARGENTINA, Jujuy, 1 ♂, Hornillos, Ruta 9 km 1762, 5–7.III. 2010, col. Fidalgo P. ( MACN). Paratypes: 1 ♂ same data of holotype ( IFML); 1 ♂, Hornillos, 17.I.2011, col Diez, Garlati ( MACN); 4 ♂, Hornillos, 24.II.2015, col Diez, Garlati (3 males MACN in alcohol, 1 ♂ IFML).

Distribution. Argentina (Jujuy).

Etymology. The specific epithet, obscurus , from the Latin, refers to the dark color of the body.

Figures

FIGURE 17. Plumarius obscurus sp. nov., ♂. A, Head, frontal view; B, Head, ventral view; C, Head, lateral view; D, Genital capsule, ventral view. Scale bars = 0.5 mm.