Psila helvetica
Identification: . Mesonotum yellow, but with an unpaired black stripe medially extended almost to scutellum, and with a pair of black stripes from posterior end of postpronotal lobe to level of dorsocentral seta (sometimes these black stripes may be confluent). Subscutellum black. Body length: 6.5- 7.0 mm
Distribution
Europe: Countries (published), online at Fauna Europaea, Occurrences at GBIF
Errata: absent from Finland
Shatalkin & Merz, 2010: Measurements (n=1): Body length: 6.8 mm; wing length: 6.0 mm.
Head: Ground colour yellow. Ocellar triangle blackish. Antenna yellow, but postpedicel mostly black, 1.2 times as long as wide at base. Arista brown, conspi- cuously thickened at base, covered with short, thin rays. Eye roundish, small in profile compared to gena and parafacialia. Gena about 1.2 times higher than height of eye. Compound eye about 1.5 times higher than long. Width of frons about 1.1 times less than its length from the two posterior ocelli to the lunule. Width of frons about 1.8 times less than width of head. Frons uniformly yellow. Gena about 1.3-1.4 times less high than eye. Palpus yellow, black apically.
Chaetotaxy (all setae black): 2 vertical setae; 1 fronto-orbital seta (?), postocellar seta absent.
Thorax: Ground colour yellow. Mesonotum with a broad, black stripe medially extending almost to scutellum. A pair of lateral black stripes from level of hind margin of the postpronotal lobe to level of dorsocentral seta. These lateral stripes may fuse partly with the unpaired medial stripe or be interrupted on level of suture. Subscutellum black. Anepimeron with fine, soft setulae in posterior half. Chaetotaxy (all setae black): 1 notopleural seta; 1 supra-alar seta; 1 postalar seta; 1 dorsocentral seta; 1 (pair of) apical scutellar seta, without soft, fine setulae along the margin.
Legs: Generally yellow. Middle tibia with two black apical spur-like setae of unequal size.
Wing: Entirely hyaline, with a slight yellowish tinge. Veins yellow. Section of M1+2 between R-M and DM-Cu about 1.5 times as long as previous section and sub- equal with apical section (between DM-Cu and margin). Haltere yellow.
Abdomen: Basal tergites black, other parts yellow. Terminalia not dissected. FEMALE Measurements (n=2): Body length: 6.5-7.0 mm; wing length: 7.0 mm. Comments: Otherwise as male. Terminalia not studied.