Okajimaella Nonaka & Jangvitaya

Okajimaella Nonaka & Jangvitaya, 1994b: 41 . Type species: O. clara Nonaka & Jangvitaya, 1994b, by original designation.

Female. Wing fully developed. Head (Fig. 1 A) wider than long, slightly constricted just behind compound eyes, slightly rounded at cheeks; ocellar setae I absent, setae II often very long, setae III situated at tangent of posterior margin of hind ocelli; postocular setae four pairs. Compound eyes slightly bulged, with five pigmented ommatidia slightly larger than normal ommatidia. Mouth-cone short and rounded at apex with 3-segmented maxillary palpi. Antennae (Fig. 2 A) 8-segmented, segment I with two dorsal apical setae, III and IV with forked sensoria.

Pronotum (Fig. 1 A) wider than long and not much longer than head, almost smooth or weakly sculptured laterally; two pairs of posteroangular setae developed; posteromarginal setae four pairs. Mesonotum (Fig. 2 C) weakly sculptured; median pair of setae situated near posterior margin. Metascutum (Fig. 2 C) sculpture transverse or arched medially; campaniform sensilla absent; median pair of setae behind anterior margin. Prosternal ferna narrowly separated at middle. Metasternum with sternopleural sutures weak and incomplete, not reaching anterior margin; endofurca without spinula. Metasternal endofurca without spinula. Metaepimeron with two setae. Metaepisternum without seta. Metapreepisternum developed and with two setae. Fore wings first vein with long median gap in setal row and two or three distal setae, second vein with many, almost equally spaced setae; clavus usually with four veinal and a discal setae; posteromarginal cilia wavy. Tarsi 2-segmented.

Abdominal tergites (Fig. 3 B) without ctenidia and posteromarginal craspeda; tergites II–VII with three setae (S3 to S5 setae) arranged in a straight line along lateral margin (Fig 8); tergite VIII (Fig. 4 A) without posteromarginal comb; tergite X (Fig. 4 A) without median slit; sternites without posteromarginal craspeda and discal setae; sternites II–VII with 3 pairs of posteromarginal setae; laterotergites without discal setae. Ovipositor developed.

Male. General structure and colour similar to female. Abdominal tergite IX (Fig. 3 C) with a pair of posteromarginal drepanae; sternites III–VIII each with scattered small pore plates (Fig. 3 D).

Comments. Two species have been known hitherto, both from Thailand.