Cisaris, Townes, 1969

Key to the world species of Cisaris View in CoL View at ENA

(modified from Sun & Sheng (2011) to insert four new species of Vietnam, males of the new species from Vietnam are unknown)

1. Female............................................................................................. 2

-. Male.............................................................................................. 10

2. T2 and T3 almost fused dorsally......................................................................... 3

-. T2 and T3 well separated from each other.................................................................. 4

3. T4 onwards fully exposed ( Fig. 8C View FIGURE 8 ); area dentipara punctate ( Fig. 8D View FIGURE 8 )............................. C. tergalis sp. nov.

-. T4 onwards mostly retracted under tergite 3 ( Fig. 6C View FIGURE 6 ); area dentipara densely wrinkled ( Fig. 6D View FIGURE 6 )....... C. rugosus sp. nov.

4. Antenna without white ring............................................................................. 5

-. Antenna with white ring.................................................................................7

5. Area superomedia well separated from area basalis............................................ C. tenuipes Townes View in CoL

-. Area superomedia fused with area basalis ( Figs 2D View FIGURE 2 , 4D View FIGURE 4 )...................................................... 6

6. Scutellum sub-polished, with sparse punctures, lateral carina weak, extending nearly to apex ( Fig. 2C View FIGURE 2 ); smaller body size, fore wing length 2.8–3.0 mm................................................................ C. carinatus sp. nov.

-. Scutellum densely punctate, lateral carina present basally ( Fig. 4C View FIGURE 4 ); larger body size, fore wing length 3.3–3.8 mm............................................................................................. C. robustus sp. nov.

7. Terga red or reddish brown. Area superomedia and area petiolaris separated by a strong carina........................ 8

-. Terga black. If black with apical terga blackish brown (see Fig. 1 View FIGURE 1 in Sun & Sheng 2011), area superomedia and area petiolaris combined (see Fig. 1 View FIGURE 1 in Sun & Sheng 2011)................................................................ 9

8. Face 1.8 to 1.9× as wide as long at level of upper margin. Malar space approximately 0.6× as long as basal width of mandible. Costula originating from anterior corner of area petiolaris.................................... C. takagii Kusigemati View in CoL

-. Face 2.2× as wide as long at level of upper margin. Malar space approximately 0.92× as long as basal width of mandible. Area superomedia with costula slightly behind its middle…........................................ C. mitis Pei & Sheng View in CoL

9. Area superomedia trapezoidal, anterior and posterior sides (carinae) very weak or almost absent, with costula at its posterior corner, transverse (see Fig. 5 View FIGURE 5 in Sun & Sheng 2011). Ocular-ocellar line at least 2.0× as long as largest diameter of ocellus (see Fig. 3 View FIGURE 3 in Sun & Sheng 2011)..................................................... C. canaliculatus Sun & Sheng

-. Area superomedia hexagonal, with complete and strong carinae, costula originating from its posterior corner, leaning slightly forward laterally. Ocular-ocellar line 1.6× as long as largest diameter of ocellus..................... C. niger Kusigemati View in CoL

10. Terga and hind leg entirely black (see Fig. 2 View FIGURE 2 in Sun & Sheng 2011). Malar space 0.42 to 0.47× as long as basal width of mandible. Area superomedia and area petiolaris completely combined.................... C. canaliculatus Sun & Sheng

-. Terga brown or darkish brown. Hind leg reddish brown or darkish brown. Malar space at most 0.3× as long as basal width of mandible. Area superomedia separated from area petiolaris by strong carina...................................... 11

11. Area superomedia approximately 1.5× as wide as long, costula originating from its middle........... C. mitis Pei & Sheng View in CoL

-. Area superomedia approximately 2.7× as wide as long, costula originating from anterior corner of area petiolaris............................................................................................ C. takagii Kusigemati View in CoL