Zethus (Ischnocoelia) Perkins, 1908

Lopes, Rogerio Botion, Carpenter, James M. & Noll, Fernando Barabosa, 2021, Cladistic analysis of Zethus Fabricius, 1804 (Hymenoptera, Vespidae): a new subgeneric classification, Journal of Hymenoptera Research 82, pp. 253-283 : 253

Zethus (Ischnocoelia) Perkins, 1908 stat. nov.

Fig. 6

Ischnocoelia Perkins, 1908: 28, 32 (genus). Perkins 1912: 118 (distinct from Elimus ). Meade-Waldo 1913: 44; 1914: 459 (note on synonymy). Bohart and Stange 1965: 11. Giordani Soika 1969: 66 (key to species). Cardale 1985: 177-179 (cat.).

Ischnocoelia xanthochroma Type species: Ischnocoelia xanthochroma Perkins, 1908.

Stenolabus von Schulthess, 1910: 189 (genus). Meade-Waldo 1914: 459 (jr. syn. of Ischnocoelia ).

Stenolabus fulvus Type species: Stenolabus fulvus von Schulthess, 1910.

Description.

Male antennae as a hook. Interantennal carinas variable. Clypeus of female long, considerably passing acetabulum with convex apical margin, without microstriae nor apical teeth. Maxillary and labial palpi 3-segmented (Fig. 6B ). Galea reaching first pair of coxae. Male mandible 4-toothed. Small ventral branch of occipital carina ventrally. Vertex flat. Genal margin evenly convex. Pronotal carina lamellar, strongly sinuous laterally. Pretegular carina absent. Welts variable. Notaulices present, incomplete. Tegula evenly convex, with outer margin raised only on posterior half. Epicnemial carina variable. Mesepimeron without carina. Mid tibia with two spurs. Metanotum not anteriorly margined with lateral carina reaching posterior half of sclerite. Posterior tibiae of females with one row of spines. Apical angle of marginal cell variable. Dorsal aperture of propodeum absent. Propodeum only with lateral carina. Dorsal margin of propodeal origice rounded. Apical lamella of propodeum rounded and contiguous (Fig. 6C ). T1 with short or long stem and medium expansion. Anterior margin of S1 quadrate. Apical lamellae of T2 and T3 and S3 developed and simple, without lateral indents. S5 and S6 in males with transverse carina. Volselar crest axe-like.

Observations.

The ICZN stablishes that a species’ epithet should agree with the gender of the genus. Since Ischnocoelia is female and Zethus , male, there is a mandatory spelling change (Art. 34.2, ICNZ) for names that are female. While most of the specific epithets could simply be converted into masculine form due to the new combination under Zethus and kept similar to the current valid one, a new name had to be given to Ischnocoelia ferruginea due to homonomy. The new combinations of other species are given in the Suppl. material 3.

Distribution.

Australian.

Included species.

14.

Figures

Figure 6. Synapomorphic characters of Zethus (Ischnocoelia) A habitus of Z. xanthocrhomus B labila palpus of Z. elongatus C propodeum of Z. integrus, oblique view; arrow indicates continuity between both apical lamellae. Scale bars: 1.0 mm.