Plumarius gracilior 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 : 455-456

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

( Figs 9 A–D)

Diagnosis. This species is characterized by the modetate ocelli, being the anterior ocellus tangent to the supratorular line; in other species the ocellus is either crossed by the supra-torular line or it is located above such line. Description. Holotype, ♂. Body length 5.1 mm. (paratype 7.2 mm.). Color. Body brown light.

Head. 1.1 × wider than high in frontal view; wider in dorsal view than width of scutum between tegulae (4.8:4.4). OOD 2 × diameter of lateral ocellus; POD 1.0 × OOD. Antennocular distance 0.5 × diameter of torulus; interantennal distance 5.2 × antennocular distance. Vertex smooth, without striae or punctures between lateral ocelli. Torulus at almost same distance to lateral ocellus as to basal margin of clypeus (8.0:10.0). Lateral ocelli in frontal view below upper margin of head. Median ocellus tangent to supra-torular line ( Fig. 9 A). Genal carina present, distinct. Length of area between preoccipital carina and suboral swelling longer than suboral swelling (1.3:0.7); this area without median, longitudinal carina; lower area of genal bridge close to mandibular articulation without carinae or punctures ( Fig. 9 B). Lengths of malar area and apical width of F1 equal (0.6:0.6); malar area anteriorly striate. Supraclypeal area with weak lateral striae, scarcely punctate in lateral view ( Fig. 9 C). Epistomal suture evident. Clypeus 1.3 × wider than high, with lateral striae and scarcely punctate; apically truncate. Proportion of lengths of segments of maxillary palp, from base to apex: 10:11:17:22:20:21. Scape without projection or swelling. F1 6.7 × as long as its apical width, longer than scape and pedicel combined (2.7:1.7).

Mesosoma . Area anterior to pronotal lobe finely striate; pronotal lateral carina distinct and forming a weak lower pocket. Notaulus weakly marked, as long as admedian line. Anterior surface of scutum scarcely punctate.

Propleuron and mesopleuron without punctures. Metaposnotum with striae not reaching to posterior margin. Propodeum transverse, swollen behind spiracle; with carina anterior to spiracle. Fore wing: marginal cell with anterior margin 2.3 × as long as posterior margin; vein Rs3 longer than vein Rs4 (2.9:2.1); veins M separated from cu-a by 0.2 × length of cu-a; discal cell rectangular. Hind wing: vein cu-a prefurcal to vein M. Protarsomere 1 with two outer lateral spines; metatarsomere 1 1.4 × as long as mesotarsomere 1; inner metatibial spur 1.4 × as long as outer spur.

Metasoma. T7 triangular, pointed apically, with polished apical margin. Genitalia as in Fig. 9 D.

Examined material. Holotype, ♂. ARGENTINA, Catamarca, 1 ♂, 6 km N Belén, 1240 m, col Willink, Terán, Stange ( IFML). Paratype: 1 ♂, same data of holotype, ( IFML).

Distribution. Argentina (Catamarca).

Etymology. The name of the species refers to its very slender habitus.

Figures

FIGURE 9. Plumarius gracilior sp. nov., ♂. A, Head, frontal view; B, Head, ventral view; C, Head, lateral view; D, Genital capsule, ventral view. Scale bars = 0.5 mm.