23. excavata species-group

(2 species)

Diagnosis. Members of excavata species-group can be distinguished from other Sagola speciesgroups by the following combination of characters: body small, length 1.9–2.9 mm; frontal sulcus deep and reaching vertexal fovea (Fig. 54e); anterior frontal fovea round and partially covered by frontal rostrum, posterior frontal fovea keyholeshaped (Fig. 54e); hind wings fully developed; abdominal tergites IV–VI with discal carinae; Male tergite V distinctly depressed, with processes from anterior and posterior edge with long and dense setae between processes (Fig. 54a–b, f); only known from North Island (Fig. 55).

KEY TO SPECIES OF THE EXCAVATA SPECIES- GROUP

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

1. Larger size, length 2.5–2.9 mm; abdominal tergite V distinctly depressed with triangular processes from anterior and posterior margins (Fig. 54f)......................... S. excavata Broun

1′. Smaller size, length 1.9–2.2 mm; abdominal tergite V distinctly depressed with rectangular processes from anterior and posterior margins ............ S. aucklandensis new species