P. virgo, [431]

Palmén, on dragon-fly nymphs, [423];

on Ephemeridae inflation, [439];

on gills of Perlidae, [402];

on rectal gills, [422];

on tracheal system of immature Ephemeridae, [436]

Palmon, [546]

Palmula, [105]

Palophus centaurus, [275]

Palpares, [454]