Trichacis kaulbarsi Arias-Penna & Masner, new species

Figures 10 F; 11A–11G

Female. Body length: 1.60 mm (holotype).

Black; A1–A10 brown and mandible yellow with apex brown; leg yellow; coxa dark brown; fore wing infuscate.

Head, in dorsal view, 1.9 times as wide as long; EH <IOS; interocellar area smooth; OOL> LOL; antennal clava 4-segmented; A1 not reaching vertex dorsal margin; A2–A5, A8–A10 longer than wide; A6–A7 as long as wide; base of mandible smooth; frons above interantennal process and torulus with four deeply marked transverse striae; interantennal process smooth and surpassing ventral border of torulus; clypeus exposed; clypeal margin truncate; gena smooth; lateral region of vertex smooth between posterior ocellus and hyperoccipital carina, and with well-marked longitudinal striae between hyperoccipital carina and occipital carina; temple projection absent; hyperoccipital carina complete, distance between posterior ocellus and hyperoccipital carina shorter than posterior ocellus diameter.

Mesosoma slightly arched; antero-admedian line present; notaulus absent; anterior region of mesoscutum coriaceous; mesoscutum posteromedially acute; parapsidal line present; central pronotal area smooth; specialized area of mesoscutellum circular and elevated; mesopleural carina incomplete (length of mesopleural carina/length of mesopleuron = 0.29); fore wing distinctly surpassing apex of metasoma.

Metasoma moderately elongate; combined length of T3–T6 <T2; T1 shorter than wide; T2 longer than wide; T3–T6 wider than long; anteromedial area of T2 smooth and flattened; T3–T6 densely covered by deep punctuation; T6 subtriangular.

Male. Body length: 1.4 mm (allotype); 1.60 mm (paratype); mean ± SD = 1.50 ± 0.14 mm. Similar to female except the following: antenna filiform; A1 yellow; A2–A10 brown; leg including coxa yellow; A8 as long as wide; T1 shorter than wide; T2 longer than wide; T3–T5 wider than long; T3–T7 densely covered by deep punctuation.

Etymology. Named after M. Kaulbars, the collector of the holotype and allotype.

Diagnosis. Trichacis kaulbarsi and T. colombiana have notaulus absent. However, T. kaulbarsi has a smooth interocellar area and a complete hyperoccipital carina.

Material examined. Holotype: 1 Ƥ, MEXICO, SLP 400 km W, Xilitla, 1700 m, June 12 1983, M. Kaulbars (CNCI); allotype: 1 3, with the same data as holotype (CNCI); paratype: 1 3, with same data as holotype but caught in June 12–August 6 1983, FIT, S. Peck (ICN).

Holotype is deposited in CNCI.