Diglyphus

Fore wing with submarginal vein (SMV) with 3 or more setae dorsally. Postmarginal vein (PMV) present: at most 1.25 times longer than stigmal vein (STV), often equal or shorter.
Scape usually slender, sometimes swollen and not exceeding apex of vertex. Funicle 2-segmented and club 3-segmented both in male and female.
Fronto-facial suture (ffs) adjacent anterior ocellus and one transverse groove (gr) between eye margin and scrobal cavity placed about halfway between ocellus and torulus.
Malar sulcus present and straight.
Propleura separated posteriorly and not covering prosternum. Notauli either incomplete, or complete and curving to meet axilla. Scutellum with 2 pair of setae and with 1 pair of longitudinal grooves. Propodeum with or without median carina and always without plicae. Petiole not distinct.
Coloration entirely or prevalently metallic.

Diglyphus is a moderate sized genus (less than 50 described species) recorded in Afrotropical, Nearctic, Neotropical, Oriental and Palearctic regions (Noyes, 2001).

Diglyphus belongs to the tribe Cirrospilini having funicle 2-segmented in both sexes, propleura separated posteriorly, submarginal vein with 3 or more setae dorsally and 2 pairs of scutellar setae.
Diglyphus can be distinguished from the other Cirrosplini included in the key as follows: Cirrospilus, Diaulinopsis and Semielacher have notauli complete and reaching posterior margin of mesoscutum; Cirrospilus “variegatus group” and Zagrammosoma have extensive yellow markings on the body and vaulted vertex; Diaulinopsis has postmarginal vein at least 1.50 times stigmal vein; Semielacher, Meruana and Danuviella have a distinct petiole; Meruana has also propodeal plicae which converge posteriorly. Finally, Cirrospilus ambiguus and Danuviella seem to be the closest taxa to Diglyphus: C. ambiguus has notauli curving to axilla as all Diglyphus have, but may be recognized by having yellow markings on head and on the gaster; Danuviella has a small but distinct petiole.
Reviews or keys for Diglyphus are available for North America (Gordh & Hendrickson, 1979), Europe (Yefremova & Shrol, 1996b) and China (Zhu et al., 2000b).

Diagnosis

Distribution

Biology