Periplaneta americana, [236];

P. australasiae, [221], [236], [239]

Periplanetides, [241]

Perisphaeriides, [241]

Perla, anatomy, [403] f.;

nymph, [400];

P. cephalotes, [406];

P. maxima, [400], [406];

P. parisina, [399]

Perlidae, [398] f.