See description from Papp, 2003
Chamaepsila triorbiseta sp. n.
Holotype - Female (HNHM): Duna-Ipoly NP: Kemence, KirAlyhAza, Petasitetum, 2000.
augusztus 1, leg. Papp L. Measurements (in mm): body length 3.44, wing length 3.26, wing breadth 1.52.
Most of the head and all thorax shiny yellow, abdomen bright black. Frons bright reddish yellow with a broad black anterior part but supralunular area also reddish yellow in the form of a triangle. Head with 3 vertical pairs, ocellar and postocellar pairs strong (both widely divergent), 3 medium-long fronto-orbital pairs of setae (Fig. 13). Genae broad, below eye 0.36 mm, height of eye 0.59 mrn. First flagellomere deep black. Arista 0.57 mm long. Palpi short, comparatively thin, black; clypeus and proboscis whitish yellow. Wings transparent, light yellow, veins yellow. Wing ratios: R-M - dM-CutM's last section: 1.27 md1.15 mm = 1.105, dM-CuICu 0.37 md0.165 mm + 0.055 mrn to wing margin.
Halteres as well as squamae and squamal fringe yellowish white. One pair of posterior np, 1 sa, 2 dc, 1 (apical) sc pairs of setae. Anepisternum densely, katepisternum scarcely pilose.
Legs without characteristic setae, except for the 0.22 mm long ventroapical of mid tibia (also this seta is yellow).
Abdominal hairs white (whitish yellow). Female cerci at least 0.23 mm long with a 0.145 mm long subapical plus several shorter hairs.
This species with three fronto-orbital setae is peculiar, indeed. It does not fit in the keys of Sobs (1980) or Shatalkin (1986). In Sobs's key it runs to couplet 26 (25), in Shatalkin's to couplet 11 1 (1 12), i.e. to Ch. mongolica Sobs, 1974 (Shatalkin's key is particularly clever, the number of the fronto-orbitals is not used as key characters in main braching). Indeed, the new species is similar to Ch. mongolica: 2 dc pairs, thorax yellow but abdomen black, first flagellomere black. The holotype and the paratypes of Ch. mongolica are preserved in the HNHM and they were studied in the course of this description. The species Ch. mongolica is larger, its frons is wholly yellow, its abdomen is lighter and it has only 2 pairs of fronto-orbital setae (I could see only 1 pair in most of the specimens)