16. arboricola species-group

(2 species)

Diagnosis. Members of the arboricola speciesgroup can be distinguished from other Sagola species-groups by the following combination of characters: body length 2.3–3.0 mm; antennomere 1 approximately 1.5 times longer than wide; frontal sulcus deep reaching one-third length of eye; anterior frontal fovea oval, posterior frontal fovea round (Fig. 41e); eye large and prominent, approximately as long as temple (Fig. 41e); ventral surface of male head with process bearing dense setae behind mouthparts (Fig. 41f); hind wings well-developed; abdominal tergites IV–VI with discal carinae.

KEY TO SPECIES OF THE ARBORICOLA SPECIES- GROUP

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

1. Body length 2.3–2.7 mm; antennomeres 2–10 with distinct tubercles; ventral surface of head with inverted triangular process bearing dense setae behind mouthparts (Fig. 41f); abdominal ventrite VII with round depression medially ................................... S. arboricola Broun

1′. Larger body, length 2.5–3.0 mm; ventral surface of head with blunt process bearing dense setae behind mouthparts; antennomeres 2–10 subquadrate and weakly enlarged; abdominal ventrite VII simple ........... S. tenebrica Broun