Bradynobaenus diminutus, 2017

Torréns, Javier & Fidalgo, Patricio, 2017, Two new species of Bradynobaenus Spinola, 1851 (Hymenoptera: Bradynobaenidae) in the semiarid area of Argentina, Zootaxa 4232 (2), pp. 293-300 : 294

Key to species of Bradynobaenus

Females (modified from Torréns & Roig-Alsina, 2009)

1. Mesonotum at each side with oblique line of punctures and setae running from anterolateral angle towards midline, and reaching posteriorly beyond middle of scutum; with no punctures along anterior margin of scutum. MLS arcuate backwards in front of pronotal lobe; forming densely punctate band on middle of mesopleuron, which is connected by a few or no punctures with line of setae in front of mid coxa......................................................................... 2 - Mesonotum with irregular or oblique line not reaching to middle of scutum; with few punctures and setae along anterior margin of scutum, either in a row or dispersed . MLS interrupted or rather straight in front of pronotal lobe; middle of mesopleuron variable............................................................................................ 3 2. Proximal tooth of mandible basally thickened. Scape , most of legs except tarsi, and basal four metasomal terga black......................................................................................... B. chubutinus Brèthes - Proximal tooth of mandible not thickened. Scape, most of legs except tarsi, and all metasomal terga light brown......................................................................................... B. riojanus Torréns & Alsina 3. Mandible with three teeth, middle tooth close to proximal tooth and displaced internally . MLS forming dense band with coalescent punctures all way from upper end of meso-metapleural suture to area in front of mid coxa............................................................................................................. B. gayi Spinola - Mandible with two teeth, or with three evenly spaced teeth in a row . MLS in front of pronotal lobe not forming a band, but with punctures more or less in a row to absent...................................................................4 4. Mandible with three teeth; proximal tooth blunt, of similar size or slighly smaller than middle tooth . MLS in front of pronotal lobe with punctures forming continuous row. Metasoma with dark spots on second to fifth tergum, or unifomely light brown................................................................................................... .. 5 - Mandible with two teeth, or if three, proximal tooth pointed, larger than reduced middle tooth . MLS in front of pronotal lobe indicated by a few spaced punctures to absent. Metasoma with dark spots or uniformely colored on second tergum only....8 5. Length 6.0–9.0 mm. Metasoma reddish brown, second to fifth terga with dark lateral spots. Setae on antennal scape, head, and dorsum of mesosoma brown to black..................................................... B. wagenknechti Reed - Length 3.2–5.0 mm. Metasoma uniformely orange to pale yellowish. Setae on antennal scape, head, and dorsum of mesosoma whitish..............................................................................................6 6. Length 4.7–5.0 mm. General body color testaceous to orange ( Fig. 3 ) . MLS continuous, sigmoid ( Fig. 5 ). Oblique line of mesonotum irregular ( Fig. 10 )......................................................... B. cordobensis Genise - Length 3.2 mm. General body color light brown to yellowish ( Fig. 1 ) . MLS interrupted and with a few setae ( Fig. 6 ). Oblique line of mesonotum homogeneously distributed ( Fig. 8 )....................... B. diminutus Torréns & Fidalgo , sp. nov. 8. Mandible with two teeth. Mesopleural area behind line of setae finely sculptured................... B. bidentatus Genise - Mandible with three teeth. Mesopleural area behind line of setae smooth, polished................................. 9 9. Second tergum of metasoma completely dark brown to black ( Fig. 17 ). Surface of pronotum smooth except laterovertical surface with feeble irregular carinae . MLS continued up to pronotal lobe height ( Fig. 16 ). Mesonotum with anterolateral punctures forming single line ( Fig. 18 ).......................................... B. porteri Torréns & Fidalgo , sp. nov. - Second tergum of metasoma with two spots towards the sides ( Fig. 19 ). Surface of pronotum completely smooth . MLS continuous beyond pronotal lobe height ( Fig. 15 ). Mesonotum with anterolateral punctures forming two lines ( Fig. 20 ).............................................................................................. B. subandinus Genise

Males (modified from Genise, 1986) (unknown in B. porteri B. diminutus

1. Length 10–15 mm. Gaster light brown to red. Wings slightly infuscate................................ B. gayi Spinola

- Length 6–10 mm. Gaster black to dark brown. Wings hyaline...................................................2

2. Antennal flagellum orange............................................................. B. wagenknechti Reed

- Antennal flagellum dark brown to black....................................................................3

3. Inner edge of mandible with a sharp flange anterior to the tooth, separated by a notch. Tenth flagellomere similar to first flagellomere in length................................................................. B. chubutinus Brèthes

- Inner edge of mandible with one tooth, without a flange. Tenth flagellomere longer than first flagellomere............................................................................................. B. australis Pérez D ´Angello

Figures

FIGURES 1 – 6. Bradynobaenus spp. (♀). 1, 2. B. diminutus sp. nov.: 1. Habitus, lateral view; 2. Head and antenna, frontal view, mandible magnified. 3 – 5. B. cordobensis: 3. Habitus, lateral view; 4. Head, frontal view; 5. Mesosoma, lateral view. 6. B. diminutus, mesosoma, lateral view. MLS shaded.

FIGURES 7 – 10. Bradynobaenus spp. (♀). 7, 8. B. diminutus sp. nov.: 7. Metasoma, dorsal view, tergum 6 magnified; 8. Mesosoma, dorsal view, line of punctures marked. 9, 10. B. cordobensis: 9. Metasoma, dorsal view, tergum 6 magnified; 10. Mesosoma, dorsal view, line of punctures marked.

FIGURES 17 – 20. Bradynobaenus spp (♀). 17, 18. B. porteri sp. nov.: 17. Metasoma, dorsal view, tergum 6 magnified); 18. Mesosoma, dorsal view, line of punctures marked. 19, 20. B. subandinus: 19. Metasoma, dorsal view; 20. Mesosoma, dorsal view, line of punctures marked.

FIGURES 11 – 16. Bradynobaenus spp. (♀). 11, 12, 16. B. porteri sp. nov.: 11. Habitus, lateral view; 12. Head, frontal view, mandible magnified; 16. Mesosoma, lateral view; 13 – 15. B. subandinus: 13. Habitus, lateral view; 14. Habitus, dorsal view; 15, Mesosoma, lateral view.