Polycentropodidae, Ulmer, 1903

Key to final instar larvae of Polycentropodidae View in CoL genera and Polycentropus species in the Hellenic western Balkan region (= European Ecoregion 6).

1 Basal segment of anal proleg without bristles ( Fig. 8 View FIGURES 8 – 9 a); pair of short spines present on abdominal sternum IX ( Fig. 8 View FIGURES 8 – 9 b)............................................ Neureclipsis McLachlan 1864 View in CoL (only Neureclipsis bimaculata (Linnaeus 1758)) View in CoL

- Basal segment of anal proleg with numerous bristles; short spines lacking ( Fig. 4 View FIGURES 3 – 4 )..................................2

2 Inner apex of anal claw with four blunt teeth ( Fig. 9 View FIGURES 8 – 9 c)...... Cyrnus Stephens 1836 View in CoL (only Cyrnus trimaculatus (Curtis 1834)) View in CoL

- Inner apex of anal claw smooth ( Fig. 4 View FIGURES 3 – 4 )....................................................................3

3 Ratio of protarsal length / protibial length <0.50............................................................ 4

- Ratio of protarsal length / protibial length>0.70 ( Fig. 2 View FIGURES 1 – 2 ); anal claw obtuse-angled ( Fig. 4 View FIGURES 3 – 4 )...........................5

4 Anal claw obtuse-angled (as in Fig. 4 View FIGURES 3 – 4 ); distance between median border of spot ‘m’ and frontoclypeal suture greater than length of this spot ( Fig. 5 View FIGURES 5 – 7 ).................................................. Polycentropus excisus Klapálek 1894 View in CoL

- Anal claw right-angled ( Fig. 7 View FIGURES 5 – 7 ); distance between median border of spot ‘m’ and frontoclypeal suture equal to length of this spot ( Fig. 6 View FIGURES 5 – 7 )........................................................ Polycentropus flavomaculatus ( Pictet 1834) View in CoL

5 Head width <1.65 mm ................................................... Polycentropus ierapetra Malicky 1972 View in CoL

- Head width> 1.65 mm ........................................................... Plectrocnemia Stephens 1836 View in CoL (The larvae of only three species within European Ecoregion 6 are known: P. brevis McLachlan 1871 View in CoL , P. conspersa ( Curtis 1834) View in CoL , and P. geniculata McLachlan 1871 View in CoL ; these species can be identified using the keys of Edington & Hildrew 1995 and Waringer & Graf 2011).