P. formosus, [105]

Pérez, on bee-parasitism, [32];

on Halictus, [24]

Pericoma canescens, [470]

Pericopinae, [409]

Peridrepana, [401]

Perilitus, [282]

Peripneustic, [450]

Peritracheal spaces, [332], [333]

Perkins, R. C. L., on bee and acarid symbiosis, [70];