2. rugifrons species-group

(4 species)

Diagnosis. The members of the rugifrons species-group can be distinguished from other Sagola species-groups by the following combination of characters: body length 2.1–3.4 mm; antennomere 1 at least 2 times longer than wide with dull surface; gular region of male head with bean-shaped opening and transversely open inside (Fig. 8j: arrow); ventral surface of male head with pair of short carinae from posterior margin of eyes, as long as eye (Fig. 8j); male fore femur with semicircular depression; male mid-femur with shallow depression; male mid-tibia bent; abdominal tergites IV–VI with discal carinae; present on North Island, not known from South Island (Figs. 9–10).

KEY TO SPECIES OF THE RUGIFRONS SPECIES- GROUP

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

1. Body large, length 3.0– 3.4 mm; head weakly transverse; frontal rostrum with distinctive punctures; densely setose around posterior frontal fovea.................................. ................................ S. brouni new species

1′. Body smaller, length 2.1–2.6 mm; head as long as wide; not densely setose around posterior frontal fovea; frontal rostrum without punctures .................................... 2

2(1′). Antennomeres 4–8 longer than wide; major process of median lobe of genitalia slender .................................................................... 3

2′. Antennomeres 4–8 subquadrate; major process of median lobe of genitalia broad and rectangular (Fig. 8h) .................................... ......................... S. plentyensis new species

3(2). Apical major process of median lobe of genitalia arrowhead-shaped (Fig. 8b)........ ................... S. waipouaensis new species

3′. Apical major process of median lobe of genitalia triangular (Fig. 8a)...................... ................................... S. rugifrons Broun