_Anchomenus marginatus_, Linn., slightly modified in Madeira, 38.
Andes, dissimilarity of the fauna on the opposite sides of the, 146.
_Anobium striatum_, Oliv., unaffected by climate, 31.
Antennæ, joints of, said occasionally to vary, 96.
_Anthicus bimaculatus_, Illig., variability of, near the sea, 63.
_---- fenestratus_, Schmidt, slightly modified in Madeira, 38.
_---- humilis_, Germ., variability of in salt places, 63.
_---- instabilis_, Hoffm., pallid hue of, 64.
_Anthonomus ater_, Mshm, very small in Lundy Island, 58, 73.
_Aphelocheirus æstivalis_, Fabr., the hemelytra of, sometimes fully developed, 100.
_Aphodius nitidulus_, Fabr., paler in Madeira than in Europe generally, 65.
_Aphodius plagiatus_, Linn., usually black in England, 61; two distinct states of, indicated, 105.
_Apocyrtus_, its concentration in the Philippine Islands, 143.
_Apotomus_, common to Madeira and Sicily, 139.
_Argutor_, always apterous in Madeira, 82; trophi of, almost identical with those of _Calathus_, 175.
Armadillos, their peculiarity to S. America, 143.
Armitage, Mr., on _Cicindela fasciatopunctata_ from Mount Olympus, 41.
Arrangement, a lineal one is not indicated in Nature, 163.
Atlantic continent, Prof. E. Forbes on the former existence of, 137.
Atlantis of the ancients, the impossibility of its being identified with a former Atlantic region, 140; perhaps the New World, 141.
_Atlantis_, the genus, a modification of _Laparocerus_, 143.
Azores, the colonization of, by two Madeiran _Helices_, 133.
Bacon, Lord, on the importance of analogies, 13; on the Atlantis of the ancients, 141; on the necessity of observation for forming science, 159.
Banksias, their concentration in Australia, 142.
Barriers, natural, the difference between primary and recent, 145; their hindrance to insect diffusion, 145.
_Bembidium Atlanticum_, Woll., paler in Porto Santo than in Madeira, 66; the variations to which it is subject, 107, 108.
_---- bistriatum_, Dufts., paler in saline districts, 62.
_---- ephippium_, Mshm, pallid hue of, 64.
_---- obtusum_, Sturm, varies in southern latitudes, 33.
_---- pallidipenne_, Illig., pallid hue of, 64.
_---- saxatile_, Gyll., variety of, on the south coast of England, 60.
_---- Schmidtii_, Woll., perhaps a state of _B. callosum_, 66.