ACMOPOLYNEMA Ogloblin, 1946

(Figs 1–30)

Acmopolynema Ogloblin, 1946: 286 . Type species: Stichothrix bifasciatipennis Girault, 1908, by original designation.

Grangeriella Soyka, 1956b: 17 . Type species: Grangeriella indochinensis, 1956, by original designation. Synonymy by Hayat & Anis, 1999b: 297.

Neonarayanella Husain & Farooqi, 1996: 83 . Type species: Maidliella orientalis Narayanan, Subba Rao & Kaur, 1960, by original designation. Synonymy by Hayat & Anis, 1999b: 297.

Baburia Hedqvist, 2004: 235 . Type species: Baburia narendrani Hedqvist, 2004, by original designation. Synonymy by Triapitsyn & Berezovskiy, 2007: 6.

Diagnosis. Body length 760–2500 μm. Face with torulus separated from transverse trabecula by about twice its own diameter (Figs 2, 13); propleura abutting medially anterior to prosternum (Fig. 21); propodeum with V- shaped median carinae (Figs 8, 19, 23); fore wing usually with dark transverse bands (Figs 1, 7a), sometimes without (Fig. 7b) and with some discal setae (especially on dark bands when present) modified, with enlarged bases; petiole distinctly longer than wide (Figs 9, 12, 24–26), ventrally with longitudinal suture, and apparently attached to gs 1 (Figs 11, 12, 29).

Discussion. Acmopolynema belongs to the Polynema group of genera as defined and keyed by Triapitsyn & Berezovskiy (2007). Among the nine other Nearctic genera of the Polynema group ( Caraphractus, Cnecomymar, Eustochus, Kalopolynema, Mymar, Neomymar, Palaeoneura, Polynema, Stephanodes), Acmopolynema is unique in having the propodeal carinae V- shaped. Acmopolynema species with clear wings, e.g., A. immaculatum Schauff, are most likely to be confused with Polynema species. The largest Nearctic species of Mymaridae, A. varium (Girault) at 2.5 mm in length, is classified in Acmopolynema .

Nearctic hosts. Cercopidae, Cicadellidae, Hemiptera: Orthoptera: Oecanthidae .

Important references. Schauff (1981) and Fidalgo (1989) treated the Nearctic and Neotropical faunas, respectively. Yoshimoto (1990) attempted to divide the Western Hemisphere species into species groups and keyed the groups. Although only slightly relevant to the Western Hemisphere fauna, Triapitsyn & Berezovskiy (2007) provided a useful key to Polynema -group genera and treated the Oriental and Australasian species.