Full-text - Norsk entomologisk forening

Platycheirus 169
Fig. 2.
Platycheirus angustitarsis Kan., male. A) Head in profile. B) Antenna. C) Right frontal leg.
D) Abdomen.
are decreasing in length towards tip of fl. fl
also with a long curled hair before apex.
Squamulae greyish to yellowish-white with
posterior rim dark greyish-brown. Halters
greyish-brown with the knob darkened.
Abdomen. Tergites black, slightly shining.
The triangular spots of tergite 2-4 bronzy
brown with greyish-white dusting. Tergite 5
shining metallic black. The hairs mainly
follow the ground-colour of the tergites,
lateral hairs rather long and whitish.
Sternites pellucid brownish-black with faint
whitish dusting, the hairs whitish-yellow.
Female
Head. Vertical triangle and frons glittering
black, frons with whitish dusting narrowly
along eye-margins and then on the triangular
spots in the middle of frons. The hairs black
on anterior part of vertical triangle and on
upper part of frons, lower part of frons
mainly with yellowish hairs. Antennae somewhat
larger than in the male, black and with
third joint a little longer than deep. Arista
black and almost bare. Face a little more protruding
and 'nosy' than in the male, whitish
or whitish-yellow dusted except for the facial
tubercle, upper mouth-edge, and jowls; the
hairs are whitish-yellow. Occiput whitish to
whitish-yellow dusted, more yellowish dusted
on upper parts; the hair colour mainly follows
the colour of the dusting.
Thorax. Mainly as in the male, but mesonotal
hairs a little shorter. Wings and legs as
in the male, except for the characteristic hairs
and bristles of pl and pa Squamulae and
halters as in the male.
Abdomen. Tergites shining black with the
triangular spots of tergite 2-4 metallic grey,
and with much of the same purple and greenish-yellow
lustre as in female of P. ambiguus.
Sternites and abdominal pubescence as in
the male.
MATERIAL
The material totals 17 $ $ and 15 99. Holotype:
male specimen dated Norway, Spiter-