NORSK ENTOMOLOGISK TIDSSKRIFT - Norsk entomologisk forening

In~~estigations regarding the Plecoptera fauna in Rogaland 109
Fig. 8. Brachjptera risi (Norton). The last abdominal segments of the male,
A dorsal -, B lateral view.
Fig. 9. Taeniopteryx nebzrlosa (LinnC). The last abdominal segments of the
male, A lateral -, B ventral - and C dorsal view.
A
B
Fig. 10. A) the cercus of Amphinen7ura borealis (Morton), B) the cercus
of A. sulcicollis (Stephens).
nymphs agree with Brinck's description (Brinck 1949). The colour
aries to some extent from dark to paler brown. The stout bristles
on the femura are always distinct. The bristles on the cerci are
usually as long as, and in most cases longer than the joints
(fig. 10A). This is always the case in the anterior part of the
cerci; in the posterior part, some nymphs have joints longer than
the bristle. This constitute the best characteristic for distinguishing
rl~~zphinemura borealis from the near-related A. sulcicollis
in which the cerci are about half the length of the joint (fig.
10B). The bristle characters were easily seen in the nymphs ready
for emergence. The adults agree closely with Brinck's description.
The length of the female 6-7 mm, the male 4-5 mm.