Ismarus bicolor, Kim, Chang-Jun, Copeland, Robert S. & Notton, David G., 2018

Kim, Chang-Jun, Copeland, Robert S. & Notton, David G., 2018, The family Ismaridae Thomson (Hymenoptera, Diaprioidea): first record for the Afrotropical region with description of fourteen new species, African Invertebrates 59 (2), pp. 127-163 : 134-135

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.