Synagris, Latreille in de Saussure, 1852

Selis, Marco, 2023, Taxonomic revision of the subgenus Synagris (Paragris) de Saussure (Hymenoptera: Vespidae: Eumeninae), Journal of Natural History (J. Nat. Hist.) 57 (41 - 44), pp. 1949-1962 : 1961

Key to the species of Synagris in the subgenus Paragris

1. Inferior carina of propodeum strongly developed, forming a high lamella running from posterolateral corner of propodeum to valvula; triangular lobe on posterolateral corner of propodeum fused with inferior carina and not distinct ( Figure 4d ). S2 basally with a pair of longitudinal carinae ( Figures 4e , 5c ). Male clypeus short pyriform, similar to female ( Figure 4b ) ................................................................................... S. rufopicta Tullgren.

- Lower carina of propodeum less developed, not forming a lamella; triangular lobe on posterolateral corner of propodeum distinct ( Figure 1e ). S2 not carinate. Male clypeus very deeply emarginate in S. huberti ( Figure 1b ), not known in S. ornatissima ............ 2.

2. Female clypeus more markedly striate, shiny; apical margin shallowly but distinctly emarginate; preapical area flattened ( Figure 3c ). Protuberances of metanotum longer and pointed, area between them evenly concave. Punctures on whole body finer and shallower; mesoscutum posteriorly and scutellum entirely almost impunctate; mesepisternum with few scattered punctures; dorsal faces of propodeum with dense transverse striae. T2 with two pairs of pale spots ............................ S. ornatissima Maidl.

- Female clypeus finely and sparsely microstriate, matte; apical margin truncate and weakly protuberant in the middle; preapical area with longitudinal depressions on sides and longitudinal ridge in the middle, giving it a ′pinched̍ appearance ( Figure 1c ). Protuberances of metanotum shorter and blunt, area between them flattened. Punctures on whole body larger and deeper; mesoscutum and scutellum entirely and densely punctate; mesepisternum with dense punctures on upper plate and posterodorsal angle of lower plate; dorsal faces of propodeum densely punctate with few fine transverse ridges. T2 without or with a single pair of pale spots ............... ............................................................................................................................ S. huberti de Saussure.

Figures

Figure 1. Synagris huberti de Saussure. a, habitus in dorsal view. b, male head in frontal view. c, female head in frontal view. d, male mandible in lateral view. e, metanotum and propodeum in posterodorsal view.

Figure 3. Synagris ornatissima Maidl, female holotype. a, habitus in dorsal view. b, habitus in lateral view. c, head in frontal view. d, labels. Credits: Harald Schillhammer and Manuela Vizek, NHMW, 2023.

Figure 4. Synagris rufopicta Tullgren. a, habitus in dorsal view. b, male head in frontal view. c, female head in frontal view. d, metanotum and propodeum in posterodorsal view. e, S2 in ventral view.

Figure 5. Synagris rufopicta Tullgren, male lectotype of S. parvula von Schulthess. a, habitus in dorsal view. b, habitus in lateral view. c, S2 in ventral view. d, labels.