Plumarius truncatus 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 : 462-463

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

( Figs 15 A–D)

Diagnosis. This species is distinguished by its truncate, transverse clypeus (1.6 × wider than high), with the apical margin nearly straight.

Description. Holotype, ♂. Body length: 4.4 mm (paratypes 3.4–4.5 mm). Color. Light brown, with head darker, except light brown clypeus and mandible.

Head. 1.3 × as wide as high in frontal view; wider in dorsal view than width of scutum between tegulae (6.4:5.7). OOD 1.2 × diameter of lateral ocellus; POD 1.2 × OOD. Antenocular distance 0.6 × diameter of torulus; interantennal distance 2.6 × antenocular distance. Vertex reticulated, without punctures between lateral ocelli. Torulus closer to lateral ocellus than to clypeus (1.1:1.6). Lateral ocelli in frontal view below upper margin of head. Median ocellus above supra-torular line ( Fig. 15 A). Genal carina absent. Length of area between preoccipital carina and suboral swelling sub equal to length of suboral swelling (0.4:0.5); this area with median, longitudinal carina; lower area of genal bridge close to mandibular articulation with carinae ( Fig. 15 B). Malar area subequal to apical width of F1 (0.6:0.5); weakly striae anteriorly. Supraclypeal area with weak lateral striae. Epistomal suture evident. Clypeus 1.6 × wider than high, with weak lateral striae; apical margin almost straight ( Fig. 15 A); clypeus slightly rounded in lateral view ( Fig. 15 C). Proportion of lengths of segments of maxillary palp, from base to apex: 7:7:14:12:9:12. Scape without swelling or projection. F1 7.8 × as long as its apical width subequal to scape and pedicel combined (3.7:3.5).

Mesosoma . Area anterior to pronotal lobe smooth; pronotal lateral carina weak, not forming lower pocket. Notaulus weakly marked, as long as admedian line. Anterior surface of scutum scarcely punctate around admedian line. Propleuron and mesopleuron without punctures. Metapostnotum without striae reaching posterior margin. Propodeum transverse, not swollen behind spiracle. Fore wing: marginal cell with anterior margin 2.3 × as long as posterior margin; vein Rs3 longer than Rs4 (3.9:2.9); vein M separated from cu-a by 0.2 × length of cu-a; discal cell rectangular. Hind wing: veins cu-a and M interstitial. Protarsomere 1without outer lateral spines. Length of mesotarsomere 1 shorter than metatarsomere 1 (3.0:4.8); inner metatibial spur 3.7 × as long as outer spur.

Metasoma. T7 triangular. Genitalia as in Fig. 15 D, aedeagus without lateral spines

Examined material. Holotype, ♂. ARGENTINA, San Luis, 1 ♂, 20 km. N. Juan Jorba, 8.XI.1982, col Roig- Alsina ( MACN). Paratypes: 6 ♂, same data of holotype ( MACN, IFML). Salta, 1 ♂, Yacochuya (Cafayate), 16– 30.IX.1968, col Willink, Terán, Stange ( IFML). La Rioja, 2 ♂, Guayapa, Patquia, 14.X.1954, col Hayward ( MACN). Catamarca, 6 ♂, Ruta 46 66 km entre Belen y Andalgala, 1.II.2006, col Fidalgo P. ( MACN in alcohol).

Distribution. Argentina (Salta, Catamarca, La Rioja, San Luis). Variation. The specimen from Salta has a darker body.

Etymology. The specific epithet, the Latin adjective truncatus , refers to the nearly straight apical margin of the clypeus.

Figures

FIGURE 15. Plumarius truncatus sp. nov., ♂. A, Head, frontal view; B, Head, ventral view; C, Head, lateral view; D, Genital capsule, ventral view. Scale bars = 0.5 mm.