Trichacis acuminata Arias-Penna & Masner, new species Figures 1 G, 1H; 2A–2C Female. Body length: 1.80 mm (holotype); 2.25 mm (paratype); mean length ± SD = 2.03 ± 0.32 mm. Black; radicle and base of A1 yellow; distal part of A1 brown and A2–A10 dark brown; mandible brown with apex dark brown; fore leg yellow except apical tarsi brown; mid leg brown except basal 2/3 of tibia and 1–4 tarsi yellow; hind leg brown, base of trochanter, apical 2/3 of femur, apical 2/3 of tibia and tarsi darker; coxae dark brown; fore wing infuscate in posterior 2/3, with darker and lighter patterns in basal 1/3. Head, in dorsal view, two times as wide as long; EH LOL; antennal clava 4-segmented; A1 not reaching vertex dorsal margin; A2–A5 longer than wide; A6 as long as wide; A7–A9 wider than long; base of mandible smooth; frons above torulus coriaceous, and with transverse striae; interantennal process smooth, slightly curved down and surpassing ventral border of torulus; clypeus exposed; clypeal margin truncate; gena smooth; lateral parts of vertex coriaceous between posterior ocellus and hyperoccipital carina, and coriaceous and longitudinally striate between hyperoccipital carina and occipital carina; temple projection present; hyperoccipital carina incomplete, fading until reaching level of imaginary line connecting eye inner margin to posterior cephalic margin; distance between posterior ocellus and hyperoccipital carina longer than posterior ocellus diameter. Mesosoma slightly arched; antero-admedian line present; notaulus anteriorly incomplete; lateral notaular area with coriaceous sculpture along its anterior margin and inter-notaular area with anterior 1/3 coriaceous and posterior 2/3 smooth; posteromedial region of inter-notaular area convex; parapsidal line present; central pronotal area smooth; specialized area of mesoscutellum heart-shaped and elevated; median projection of specialized area of mesoscutellum subtriangular; mesopleural carina incomplete (length of mesopleural carina/length of mesopleuron = 0.52); fore wing distinctly surpassing apex of metasoma. Metasoma elongate; combined length of T3–T6

Published as part of Arias-Penna, Tania Milena, Masner, Lubomir & Delsinne, Thibaut, 2012, Revision of the Neotropical species of Trichacis Foerster (Hymenoptera: Platygastroidea: Platygastridae), with description of 24 new species, pp. 1-56 in Zootaxa 3337 on page 7, DOI: 10.5281/zenodo.281325