Acrodactyla elongata Pham, Broad, Matsumoto & Böhme, sp. nov. (Figs 1 a, 2a, 3a, 4a, 5b, 6a, 7a) Diagnosis. Mesoscutum with few hairs along lateral side of median lobe and on posteromedian part of lateral lobes; propodeum with posterior transverse carina strong, lateromedian longitudinal carinae present as short stubs attached to posterior transverse carina, hind wing with second abscissa of vein Cu 1 entirely absent; first tergite extremely long and thin, 3.5x as long as apical width. Description. (Holotype female). Body length 4.2 mm, fore wing 3.2 mm, ovipositor 1 mm. Head. Antenna with 19 flagellomeres, first flagellomere 1.3x length of second; diameter of lateral ocellus equal to ocellar-ocular distance; frons polished, with scattered hairs; inner margins of eyes straight above antennal sockets, parallel ventrally; face 1.15x as high as wide, pubescent; clypeus convex, about 0.67x as high as wide, separated from face by distinct impressed clypeofacial suture, apical margin round; malar space equal to basal width of mandible; mandible upper tooth slightly longer than lower tooth; palpi formula 5:3; occipital carina complete, meeting hypostomal carina about 1.5x basal mandible width from base of mandible, forming flange ventrally after meeting hypostomal carina. Mesosoma. Pronotum polished with scattered hairs; mesoscutum pubescent posteriorly, 1.25x as long as wide at anterior level of tegulae; scutellum strongly convex, pubescent, lateral carina present at base; mesopleuron with sparse hairs dorsally, moderately dense hairs ventrally, epicnemial carina present on lower half of mesopleuron; metapleuron polished with sparse hairs, submetapleural carina complete; propodeum moderately convex, dorsally bare with shallow hollow medially, posterior transverse carina complete, lateromedian longitudinal carinae present as small stubs attached to posterior transverse carina, short transverse striations attached to lateromedian and lateral longitudinal carinae, pleural area with sparse, long hairs. Legs long and thin, fore and mid femora without teeth ventrally; fore femur 7.6x longer than wide; hind leg with femur 7.5x as long as wide, length 0.75x tibia, tibia 13.8x as long as apical width; basitarsus 0.35x tibia, 0.4x tarsus, 1.5x second tarsomere, fifth tarsomere weakly swollen, shorter than third. Fore wing with vein Rs&M basad of cu-a, vein cu-a inclivous, 2 rs-m about half distance between 2 rs-m and 2 m-cu, vein Cu 1 a separated from 1 m-cu by 0.7x length of vein Cu 1 b; hind wing with vein M+Cu strongly curved, first abscissa of vein Cu 1 2x as long as vein cu-a, second abscissa of vein Cu 1 absent. Metasoma. Tergites polished, with sparse, short hairs; first tergite extremely long and narrow, 3.5x as long as apical wide, dorsolateral carina complete, median longitudinal carina extending over oblique groove; second tergite 0.8x length of first tergite, 1.3x apical width, basal and apical oblique grooves moderately deep, rhombic area convex; third tergite shorter than second, basal and apical oblique grooves weak; first sternite round convex apically, extending slightly beyond level of spiracle, with weak longitudinal ridges; ovipositor straight, weakly up-curved at tip, length from tip of hypopygium 0.84x as long as hind tibia. Colour. Brown. Antenna brown, except scape and pedicel yellowish ventrally, mandible, palpi, tegula, legs (except apex of hind tibia to hind tarsus) and ovipositor yellow; wings hyaline, pterostigma and veins brownish yellow. Male. Unknown. Comparison. This species belongs to the degener group (Townes & Townes 1960). It can be distinguished from A. syndromosa Kusigemati by the presence of short stubs of the median longitudinal carinae on the propodeum, hind wing with the second abscissa of vein Cu 1 entirely absent, the first tergite extremely long and thin (3.5x as long as apical width versus 2.1x), and its ground colour brown (as opposed to black). Etymology. This species is named after the elongate first tergite. Distribution. Currently known only from Hoang Lien NP, Lao Cai Province, North Vietnam (Fig. 8). Ecological notes. The single specimen was collected in mountain evergreen forest at 1,900 m a.s.l. Material examined. Holotype: Ƥ (RMNH), Lao Cai, Hoang Lien NP, 1900 m a.s.l, 15–21.x.1999, Malaise trap, C. v. Achterberg leg.

Published as part of Pham, Nhi Thi, Broad, Gavin R., Matsumoto, Rikio & Böhme, Wolfgang, 2012, First record of the genus Acrodactyla Haliday (Hymenoptera: Ichneumonidae: Pimplinae) from Vietnam, with descriptions of six new species, pp. 40-53 in Zootaxa 3207 on pages 41-44, DOI: 10.5281/zenodo.210988