Osmia.
distribution of sexes.
optional determination of sex.

Owl.
Horned Owl.
Common Owl.

Oyster-plant.

Pelopaeus.

Perez, Professor.

Philanthus apivorus.

Phylloxera.

Pieris brassicae.

Pine Processionary.
silken road of.
nest.
use of road.
senses.
nest.
the processionary march.
experiments.
on a circular track.

Pliny, on the Cabbage Caterpillar.

Pompilus.

Rose-chafer.

Sacred Beetle.

Saprini.

Sarcophaga carnaria, see Flesh-fly.

Scarabaeus.

Scolia.

Scops.

Serin-finch.

Sex, distribution, determination and permutations of, in the Osmia.

Silpha.

Sitaris.

Snail-shell, Osmia's use of.

Snail, the prey of the Glow-worm.

Sphex.

Sphex, White-banded.

Spiders.
apprised of prey by vibration.

Staphylinus.

Stizus.

Swede.

Tadpoles.

Tarantula, Black-bellied, see Lycosa.

Thistles.

Thomisus.

Toad, Bell-ringing.

Tree-frogs.

Tree Wasps.

Turkeys, how trapped.

Ventoux, Mount.

Wasp, Common.

Woodpecker.

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