4(3). Eye larger (Fig. 448, left), about ¼ head length or larger (greater than 0.13 mm in greatest length, eye length / head length ranges from 0.24 - 0.27) …………………….. vividula (Nylander)
- Eye smaller (Fig. 448, right), less than ¼ head length (less than 0.12 mm in greatest length, eye length / head length ranges from 0.20 - 0.24) ….. terricola (Buckley)