22. furcata species-group

(6 species)

Diagnosis. Members of the furcata speciesgroup can be distinguished from other Sagola species-groups by the following combination of characters: body small, length 1.8–2.2 mm; frontal sulcus inverted Y- or V-shaped, divided with each posterior end meeting vertexal fovea (Fig. 52o, q); ventral surface of male head with inverted triangular process bearing dense setae behind mouthparts (Fig. 52p, r); hind wings fully developed; abdominal tergites IV–VI with discal carinae; male abdominal ventrites V–VI weakly depressed or flattened medially and bearing dense setae; only known from South Island (Fig. 53).

KEY TO SPECIES OF THE FURCATA SPECIES- GROUP

The key is based on male specimens because most female specimens are indistinguishable based on external morphology.

1. Frontal sulcus inverted V-shaped (Fig. 52q); eye large, as long as temple (Fig. 52q); antennomeres 4–5 subquadrate..............2

1′. Frontal sulcus inverted Y-shaped (Fig. 52o); eye small, approximately one-third length of temple (Fig. 52o); antennomeres 4–5 longer than wide ..................................................... 3

2(1). Apical lobe of genitalia with V-shaped depression (Fig. 52k)...... S. ignota Broun

2′. Apical lobe of genitalia blunt apically (Fig. 52l–m)..... S. lewisensis new species

3(1′). Median lobe of genitalia at least 3 times broader than paramere (Fig. 52g) ............. ...................................... S. furcata Broun

3′. Median lobe of genitalia as wide as paramere................................................4

4(3′). Median lobe of genitalia twisted (Fig. 52h) .............................. S. punctulata Raffray

4′. Median lobe of genitalia curved vertically .................................................................5

5(4′). Only apical part of median lobe of genitalia hook-shaped (Fig. 52i)......................... ................................ S. pecki new species

5′. Entire lobe of median lobe of genitalia hook-shaped (Fig. 52j) .............................. ............................. S. muirae new species