Ismarus bicolor sp. n. Figure 3A− E

Diagnosis.

Ismarus bicolor sp. n. is similar to I. flavigena Masner, 1976 from the Nearctic Region. It differs mainly in the antenna colour, POL/OOL ratio and radial cell/marginal vein ratio: in I. flavigena, antenna dirty yellow ventrally and slightly darker dorsally, POL as long as OOL, radial cell as long as marginal vein; in I. bicolor sp. n., antenna brown except A1-A3 yellow, POL longer than OOL, radial cell 0.55 × as long as length of marginal vein.

Type material

(2♂♂). Holotype, 1♂, KENYA: Rift Valley Prov., Nakuru National Park, 1,796 m alt., 0°21.078'S, 36°03.477'E, 23. IV– 14.V.2006 (MT), R. Copeland leg., CJDAF010065 (deposited in CNCI). Paratype, CAMEROON: 1♂, North West Province, Bambili, 19.XII.1981, S. Compton leg., CJDAF010066 (CNCI).

Description.

Holotype (Male). Head. Head in dorsal view much wider than long (13:7), slightly wider than width of mesosoma (26:23) (Fig. 3A, C); POL: 9; OL: 5; OOL: 7 (Fig. 3C); ocelli large, LOL slightly longer than diameter of lateral ocellus (11:10); vertex behind ocelli nearly flat in lateral view; eye large and without setae; inner orbits, frons and temple with few sparse setae; above antennal sockets, face and cheek with few long setae; antenna much shorter than body length (7:10); scape and pedicel with scattered setae; A3-A14 with dense and short setae; blade-like carina on A4 percurrent (Fig. 3B); antennal segments in following proportions (length:width): 11:4; 6:3; 8:2.5; 8:3; 5.5:3; 5.5:3; 5:3; 5:3; 5:3; 5:3; 5:3; 5:3; 5:3; 7:3 (Fig. 3A).

Mesosoma. Pronotum in dorsal view punctate-rugose with whitish long setae; pronotal shoulders angled; upper part of lateral pronotum smooth, bare and broadly convex medially; lower part of lateral pronotum with setigerous punctures; mesoscutum smooth and convex; notauli present with 5 small pits on anterior margin (Fig. 3D); humeral sulcus deep and long, as long as length of tegula; scutellum smooth and slightly convex, posterior rim rounded (Fig. 3D); anterior scutellar pit small and deep, much shorter than remaining scutellar disc, distinctly crenulate at bottom, median keel absent (Fig. 3D); mesopleuron smooth with deep crenulate line along posterior margin; metapleuron reticulate and covered with dense whitish long setae.

Wings. Radial cell completely closed, 1.6 × as long as wide and 0.55 × as long as marginal vein (Fig. 3A).

Legs. Fore and mid legs slender; hind tibiae incrassate posteriorly, its maximum width slightly wider than hind femora (10:9).

Metasoma. Petiole subquadrate, with strong costae dorsally; base of second tergite with several short costae basally and very short median furrow, extending 0.15 × length of second tergite; suture between T2 and T3 obsolete but the following sutures between tergites distinctly impressed (Fig. 3E).

Colour. Head yellow to yellowish-brown except frons, around the ocelli and median part of vertex brown, mandibles whitish-yellow with reddish tips; mesosoma black except lower half of lateral pronotum yellow; metasoma brown except petiole black; tegulae yellowish-brown; antennae brown except A1-A3 yellow; legs yellow except hind tibiae and tarsi brown; wings hyaline, covered with brown setae.

Measurements. Head length 0.28 mm, width 0.52 mm; mesosoma length 0.59 mm, width 0.46 mm; metasoma length 0.78 mm; fore wing length 1.58 mm; Body length 1.65 mm.

Female. Unknown.

Variation.

Body length 1.65-2.09 mm. Paratype with metasomal suture between T2 and T3 well impressed.

Distribution.

Cameroon, Kenya.

Etymology.

This species is named bicolor, the Latin adjective meaning of two colours, because of the colour of the head.