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The Papilionidae, comprising many of the noblest and richestcoloured butterflies, and long placed at the head of the group, are almost as universally distributed as the Pieridae, but they do not extend to so many remote islands nor so far into the Arctic and Antarctic regions. Nine-tenths of the species belong to the genus Papilio, and these are especially abundant in tropical regions, although species occur in every region and every subregion. Well-marked sub-divisions of this large genus are characteristic of each great region—as the “APneas” group in the Neotropical, the “Paris" group in the Oriental, the “Ageus” group in the Australian, the “Zenobius” group in the Ethiopian, and many others. The few species of the Palaearctic region belong, on the other hand, to a group of universal distribution, and the Nearctic has a good number of species allied to Neotropical forms. : The other genera have mostly a very restricted range. Parmassius is an Alpine genus, confined to the Palaearctic and Nearctic regions. The Palaearctic region further possesses 5 peculiar genera—Mesapia, Hypermnestra, Doritis, Sericinus, and Thais; the Oriental has 4, Calinaga, Teinopalpus, Bhutanitis, and Leptocircus, the latter going as far as Celebes; the Australian has 1, Eurycus; and the Neotropical 1, Buryades, confined to the Chilian sub-region. The Ethiopian and the Nearctic regions have no peculiar genera.
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The Hesperidae, or Skippers, are an immense group of mostly small obscurely coloured butterflies, universally distributed, and of which hosts of species still remain to be discovered and described. As the grouping of these into genera is not yet satisfactorily accomplished, only the more extensive and best known groups will be here noticed. Pamphila and Hesperia are universally distributed; Nisoniades seems to be only absent from the Australian region. The Neotropical region is preeminently rich in Hesperidae, 33 genera being found there, of which 20 are peculiar to it; the Australian region has 12 genera, only 1 (Buschemon) being peculiar; the Oriental has 18, with 3 peculiar; the Ethiopian, 13, with 3 peculiar; the Palaearctic 6, with 1 (Erynnis) almost peculiar, a species occurring in Mexico; the Nearctic 9, with none peculiar, 4 being found also in the Neotropical region, 2 in the Palaearctic, and the rest being of wide distribution. Many new genera have, however, been recently described in the United States, but it is impossible yet to determine how many, if any, of these are peculiar. More than 100 species of the family are included in Mr. Edwards’ “Synopsis of North American Butterflies,”—a very large number considering that Europe possesses only about 30.
Sub-order—LEPIDOPTERA HETEROCERA, or MOTHS.
The Lepidoptera Heterocera, or Moths, are of such immense extent, and are, besides, so imperfectly known compared with the Butterflies, that it would serve no purpose to go into the details of their distribution; especially as most of the families and a considerable number of the genera are cosmopolitan. We propose therefore to notice only the Sphingina, which, being generally of large size and finely marked or coloured, and many of them day-fliers, have been extensively collected; and whose numbers are more manageable than the succeeding groups.
FAMILY 17–ZYGAENIDAE (46 Genera, about 530 Species).
The Zygaenidae are universally distributed, but many of the genera are restricted in their range. Zygaena (85 sp.) is mainly Palaearctic, but 2 species are South African, and 1 North American; Procris (22 sp.) has a scattered distribution, from the Palaearctic region to South America, South Africa and North India; Heterogynis (3 sp.) and Dysauwis (3 sp.) are European; Pollanisus (3 sp.) is Australian; Glaucopis (120 sp.) is mainly Neotropical, with a few Oriental; Syntomis (94 sp.) is found in all the Old-World regions; and Euchromia (150 sp.) is found in all warm countries, though especially abundant in South America.
FAMILY 18–CASTNIIDAE (7 Genera, 63 Species).
The Castniidae have an interesting distribution, being mainly Neotropical, with four genera in Australia and New Guinea. Castnia, Coronis, and Gazera, with 51 species, are Neotropical : Synemon, Euschemon, Damias and Cocytia, with 12 species, are Australian, the latter being found only in the Papuan Islands.
FAMILY 19—AGARISTIDAE (13 Genera, 76 Species).
The Agaristidae are beautiful diurnal moths, allied to the Castniidae, but almost confined to the Australian and Oriental regions, with a few in the Ethiopian. The most important genera are, Agarista (21 sp.), Australia and New Guinea; Eusemia (31 sp.), AEgocera (7 sp.), Oriental and Ethiopian regions; the other genera being confined to the islands from Java to New Guinea. .
FAMILY 20,—URANIIDAE (2 Genera, 12 Species).
These magnificent insects have a singular distribution. The gold-spangled Urania (6 sp.) is characteristic of Tropical America, but a single species of great magnificence occurs in Madagascar. The large but sober-tinted Nyctalemon (6 sp.) is found in the Neotropical, Oriental, and Australian regions.
FAMILY 21.—STYGIIDAE. (3 Genera, 14 Species.)
These insects are confined to the Palaearctic and Neotropical regions, 2 genera in the former, 1 in the latter.
FAMILY 22—AGERIIDAE (24 Genera, 215 Species.)
This family is found in all parts of the world except Australia. Algeria is most abundant in Europe, but is found also in North and South America.
FAMILY 23.-SPHINGIDAE. (40 Genera, 345 Species.)
The Sphinx Moths are cosmopolitan. The most important genera are, Macroglossa (26 sp.), Chaerocampa (46 sp.), and Macrosila (21 sp.), all cosmopolitan; Sesia (12 sp.), Europe, Asia, and North America; Deilephila (19 sp.), Palaearctic and Oriental regions, Nearctic region, and Chili; Sphina (21 sp.), Europe, North and South America; Smerinthus (29 sp.), all regions except Australia. Our Death's Head Moth (Acherontia atropos) ranges to Sierra Leone and the Philippine Islands.
General Remarks on the Distribution of the Diurnal Lepidoptera and Sphingidea. .
The Diurnal Lepidoptera or Butterflies, comprehend 431 genera and 7,740 species, arranged in 16 families, according to Mr. Kirby's Catalogue published in 1871. The Sphingidea consist of 135 genera and 1,255 species, arranged in 7 families, according to the British Museum Catalogue dated 1864; and as this includes all Mr. Bates' collections in America and my own in the East, it is probable that no very large additions have since been made. The distribution of the families and genera of Butterflies corresponds generally with that of Birds—and more especially with that of the Passerine birds—in showing a primary division of the earth into Eastern and Western, rather than into Northern and Southern lands. The Neotropical region is by far the richest and most peculiar. It possesses 15 families of butterflies, whereas the other regions have only from 8, in the Palaearctic, to 12 in the Ethiopian and Oriental regions; and as none of the Old World regions possess any peculiar families, the New World has a very clear superiority. In genera the preponderance is still greater, since the Neotropical region possesses about 200 altogether peculiar to it, out of a total of 431 genera, many of which are cosmopolitan. Comparing, now, the Eastern regions with the Western, we have two peculiar families in the former to 4 in the latter; while the Southern regions (Australian and Neotropical) possess not a single peculiar family in common. In the Sphingidea the same general features recur in a less marked degree, the Neotropical being the richest region; but here we have one family (Castniidae) which appears to be confined to the two southern regions,—the Australian and Neotropical. The distribution of the genera affords us some facts of special interest, which must be briefly noticed. There are several