Some of the _Cicindelas_ may have come with the Oriental migration. I think this was the case with the only Irish species of the genus, _C. campestris_. It occurs all over continental Europe and Northern Asia, and varieties of the species are known from Corsica, Sicily, Crete, the Cyclades, Sardinia, Asia Minor, Greece, and Spain. Five species of _Cicindela_, as I said, are known from England, of which _C. silvatica_ and _C. maritima_ are certainly Siberian migrants, and perhaps _C. hybrida_ too. Neither of the two first species is found in Southern Europe or in Spain, where we should expect them to occur had they originated on our continent. _C. silvatica_ and _maritima_ have no doubt entered Europe from Siberia in recent geological times, probably soon after a way was opened up across the Tchornosjem district of Southern Russia--that is to say, in inter-glacial times. The former spread along the Central European plain as far west as the south-east of England when Great Britain still formed part of France. _C. maritima_, which preferred the proximity of the sea, migrated along the shores of the Caspian and then across Russia to the shores of the Baltic and North Sea, and has penetrated a little farther north and west in England than its near relative. _C. litterata_ has a very similar distribution and origin, but instead of wandering so far west as the British Islands, it seems to have preferred extending its range southward, and has just reached Northern Italy. The closely allied Ground-beetles (_Carabidæ_) furnish us with equally interesting and instructive proofs of a migration from Asia. Over 300 species of _Carabus_ are known to science. The number of species inhabiting Asia and Europe are about equal. But the genus does not extend its range to Southern Asia or to South America or Australia. Very few species enter Africa, and only nine North America, of which three also occur in Siberia. The genus is unknown in Madeira, and only represented by three species in the Canary Islands. To judge from its distribution, it has probably originated in Western Asia. Probably some _Carabi_ of European origin have spread into Asia, but the Asiatic--or we might say the Siberian--origin and subsequent migration westward of a number of well-known forms appears to me evident. Such forms as _C. clathratus_, _C. granulatus_, and _C. cancellatus_ are no doubt of European origin, and have only in recent geological times extended their range across Northern Asia, whilst _C. marginalis_, coming from Siberia, can hardly be said to have invaded Europe, since it has never been met with farther west than the eastern provinces of Prussia.