Pseudoaerumnosa pilicaudata sp. n. Fig. 18 A, 21 B Material studied. Holotype male. MALAYSIA, Sabah, Bukit Monkobo, 5°48’N, 116°58’E, 900 m, Malaise trap, 7–13.VIII.1987, A.H. Kirk-Spriggs (in NMWC). Paratype. THAILAND, Khao Yai N.P., 180 m, moist semi-evergreen forest, Malaise trap, 16–20.IV.1990, B.V. Brown, 1 male (in AMNH). Description. Male. Head. Brown, antenna concolorous with face, maxillary palpus pale brown. Eye bridge 2–3 facets wide. Face with 6 long dark setae. Clypeus non-setose. Mouthparts strongly reduced. Maxillary palpus with one segment, with 3 pointed setae, with a large dorsal patch of sensilla. Antenna short, antennal flagellomeres laterally flattened, asymmetrical in relation to their necks, frontal part larger; densely setose, setae curved, body of 4th flagellomere 1.4x as long as wide, the longest setae much shorter than the width of the flagellomere, neck shorter than wide. Thorax. Brown and unicolorous; setae dark. Anterior pronotum with 4 setae. Proepisternum with 1 seta. Scutellum with 4 long and many short setae. Wing. Fumose. Length 2.5 mm. Width/length 0.50. Anal lobe rather large. Hind margin with dorsal and ventral setae. Veins distinct. R1/R 1.50. c/w 0.80. bM shorter than r-m, stM longer than M-fork. stCu slightly longer than bM. R5 joining c at about base of M-fork. R1 with dorsal and ventral setae, bM, r-m and StCu non-setose. Haltere pale brown. Legs. Yellow. Fore tibial organ unmodified, with some fine setae. Fore tibial spur as long as the tibial width. Abdomen. Pale brown; setae long, dark, and robust. Hypopygium, Figs 18 A, 21 B. Brown, like the abdomen, broad; setae dark. Gonocoxa longer than gonostylus. Gonocoxae fused, intergonocoxal area broad and rather short, microtrichose, non-setose medially, ventromedial margin roundish and distinct. Setosity of gonocoxa long and dense, shorter at medial margin.Apicomedial seta well differentiated. Gonostylus elongated, densely setose, impressed subapically, medially with an indistinct shallow lobe, with a small apical tooth with a small megaseta attached to its ventral side, with 7–8 subapical-medial megasetae, megasetae slender, shorter than apical tooth, straight or slightly curved and hyalinous. Tegmen subquadrangular, hyalinous, sclerotized basolaterally, with tiny aedeagal teeth. Aedeagal apodeme narrow, with short apical fork. Female. Unknown. Discussion. See under Pseudoaerumnosa filispicata sp. n. and P. quadriquetra sp. n. Etymology. The name is formed from the Latin words pilus, hair and cauda, tail, referring to the richly setose hypopygium of the species.

Published as part of Vilkamaa, Pekka, Halenius, Pentti & Ševčík, Jan, 2019, Review of Pseudoaerumnosa Rudzinski (Diptera, Sciaridae), with the description of twenty-four new species, pp. 1-42 in Zootaxa 4656 (1) on page 34, DOI: 10.11646/zootaxa.4656.1.1, http://zenodo.org/record/3366496