Plumarius riojanus 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 : 456-457

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

( Figs 10 A–D)

Diagnosis. This species falls in a group with the ocellus crossed by the supra-torular line and the marginal cell shorter than in P. malaris sp. nov. and related species. It is related by the short F1 to P. exophthalmus sp. nov., from which it differs by the lateral ocelli in frontal view usually above an imaginary line tangent to the upper margin of the eyes.

Description. Holotype, ♂. Body length 9.5 mm (paratypes 8.4–9.4 mm). Color. Dark brown, head darker (except clypeus and scape).

Head. 1.0 × wider than high in frontal view; wider in dorsal view than width of scutum between tegulae (7.9:7.5). OOD 1.3 × diameter of lateral ocellus; POD 1.0 × OOD. Antennocular distance 0.5 × diameter of torulus; interantennal distance 4.1 × antennocular distance. Vertex reticulated, without striae, moderately punctate between lateral ocelli (punctures separated by 1.5 × punctate diameter). Torulus closer to lateral ocellus than to clypeus (1.0:1.9). Lateral ocelli in frontal view below upper margin of head. Median ocellus crossed by supra-torular line ( Fig. 10 A). Genal carina weak. Lengths of area between preoccipital carina and suboral swelling subequal (0.8:0.9); this area without carina; lower area of genal bridge close to mandible articulation with weak carinae and without punctures ( Fig. 10 B). Malar area longer than apical width of F1 (1.0:0.5); striate anteriorly. Supraclypeal area with lateral striae; slightly rounded in lateral view ( Fig. 10 C). Epistomal suture evident. Clypeus 1.3 × wider than high, with lateral striae; apically truncate. Proportion of length of segments of maxillary palp, from base to apex: 7:7:10:11:9:10. Scape without swelling or projection. F1 4.1 × as long as its apical width, equal to scape and pedicel combined (3.1:3.1).

Mesosoma . Area anterior to pronotal lobe weakly striate; pronotal lateral carina distinct, not forming a lower pocket. Notaulus weakly marked, as long as admedian line. Anterior surface of scutum moderately punctate about admedian line. Propleuron without punctures and mesopleuron scarcely punctate. Metapostnotum with weak striae reaching to posterior margin. Propodeum transverse, swollen behind spiracle; with carina anterior to spiracle. Fore wing: marginal cell with anterior margin 2.2 × as long as posterior margin; lengths of veins Rs3 and Rs4 subequal (1.3:1.4); veins M separated from cu-a by 0.3 × length of cu-a; discal cell rectangular. Hind wing: M and cu-a interstitial. Protarsomere 1 without outer lateral spines. Metatarsomere 1 1.5 × as long as mesotarsomere 1; inner metatibial spur 1.4 × as long as outer spur.

Metasoma. T7 triangular; apically without a polished area. Genitalia as in Fig. 10 D.

Examined material. Holotype, ♂, ARGENTINA, La Rioja, Ruta 40 km 593 ca. Chilecito, 7.IV.2005, col Fidalgo P., Fidalgo G., Torréns ( MACN). Paratypes: 16 ♂ same data as holotype ( MACN); 2 ♂, Termas de Sta. Teresita, 19.II.2005, col Fidalgo P., Fidalgo G., Torréns ( MACN); 2 ♂, Termas de Sta. Teresita, 12.II.2005, col Fidalgo P., Fidalgo G., Torréns ( MACN); 1 ♂, Termas de Sta. Teresita, 5.I.2005, col Fidalgo P., Fidalgo, G, Torréns ( MLP); 1 ♂, S de Udpinango, III.2005, Fidalgo, P. Fidalgo, G, Torréns (IADIZA). Catamarca, 1 ♂, 12 km Belén S/ Ruta 46, 20.XII.2005, col Fidalgo P, Diez ( MACN); 1 ♂, ca. Amaicha del Valle, km 122, Ruta 307, 2.XI.2005, col Fidalgo P., Porter ( MACN). Tucumán, 3 ♂, entre Amaicha y Sta. María, 28.XI.2005, col Fidalgo P., Torréns ( MACN). Salta, 2 ♂, Cachi, 22.I.1966, col Stange ( IFML); 2 ♂, Molinos 10 km. S of Rumibola, 15.II.1969, col Barrera, Paganini ( IFML).

Distribution. Argentina, (Salta, Tucumán, Catamarca, La Rioja).

Variation. The specimens from Los Molinos have the protarsomere 1 with one outer lateral spine. Etymology. The name of the species refers to the collection site of the holotype.

Figures

FIGURE 10. Plumarius riojanus sp. nov., ♂. A, Head, frontal view; B, Head, ventral view; C, Head, lateral view; D, Genital capsule, ventral view. Scale bars = 0.5 mm.