Stenomesius Westwood, 1833

Fan, Jun-Jie & Li, Cheng-De, 2021, Three new species of Stenomesius Westwood (Hymenoptera, Eulophidae) from China, with a key to Chinese species, ZooKeys 1062, pp. 1-10 : 1

Stenomesius Westwood, 1833

Stenomesius Westwood, 1833: 343. Type species: Stenomesius pulchellus Westwood, by subsequent designation of Westwood 1839: 73.

Euryscotolinx Girault, 1913: 266. Type species: Euryscotolinx guttativertex Girault, by original designation and monotypy. [Synonymised with Stenomesius Westwood by Bouček 1977: 401].

Stenelachistus Masi, 1917: 201. Type species: Stenelachistus impressus Masi, by subsequent designation of Gahan and Fagan 1923: 136. [Synonymised with Stenomesius Westwood by Bouček, 1977: 401].

Nioro Risbec, 1951: 25. Type species: Nioro elegantula Risbec, by monotypy. [Synonymised with Stenomesius Westwood by Bouček 1977: 401].

Diagnosis.

The genus can be easily distinguished from other eulophine genera by the following combination of characters: female funicle 4-segmented and club 2-3-segmented; mandible developed; pronotum without transverse carina; scutellum with sublateral grooves; propodeum medially with a strong X- or H-shaped carinae; hind tibial spurs normal; petiole shorter than hind coxa, gaster usually elongate.

The genus Stenomesius is close to the genus Stenopetius Bouček and Euplectromorpha Girault in having similar type of propodeum with H- or X-shaped carinae, but it differs from Stenopetius Bouček in having: 1) female funicle 4-segmented (5-segmented in Stenopetius Bouček); 2) pronotum without transverse carina (with distinct transverse carina in Stenopetius Bouček); 3) petiole shorter than hind coxa (longer than hind coxa in Stenopetius Bouček). It differs from Euplectromorpha in having hind tibia normal, at least with one spur distinctly longer than first hind tarsal segment in Euplectromorpha .