Part 10

(Mamestra griseipennis, Feld., pl. cix. 22. Chera virescens, Butl., Cist. Ent. ii. 489. Spælotis inconstans, ib. 545; Leucania moderata, Meyr., Trans. N. Z. Inst. xix. 7 (nec Walk.). Leucania griseipennis, Meyr., Trans. N. Z. Inst. xx. 44.)

(Plate IV., fig. 8.)

This species has occurred at Wellington in the North Island. In the South Island it has been taken at Mount Arthur, Lake Coleridge, Rakaia, Akaroa, and Lake Guyon.

The expansion of the wings is 1½ inches. The fore-wings are dull greenish-grey; there are two obscure blackish transverse lines near the base and several dull white dots; a very conspicuous transverse curved black shade near the middle, followed by an extremely jagged dull white transverse line, another less jagged transverse line near the termen; the orbicular is oval, pale, edged with black; the reniform and claviform are also pale but inconspicuous; the cilia are tinged with brown. The hind-wings are grey with the cilia wholly white.

The following variety, taken on Mount Arthur, is thus described by Mr. Meyrick:--

"Var. A. Thorax and fore-wings without ochreous tinge, with numerous white scales tending to form suffused spots and margins to lines; cilia distinctly barred with darker; hind-wings grey, with dark grey, irregular terminal band."

The perfect insect appears from November till March, and is said to be very common in certain localities. It has been taken at considerable elevations in the Nelson province (4,700 feet above the sea-level on Mount Arthur, by Mr. Meyrick and myself). In Wellington it is certainly a scarce species.

LEUCANIA MODERATA, Walk.

(Agrotis moderata, Walk., Suppl. 705. Eumichtis sistens, Gn., Ent. Mo. Mag. v. 39. Mamestra sistens, Meyr., Trans. N. Z. Inst. xix. 19. Leucania moderata, ib. xx. 45.)

This species has occurred at Rakaia in the South Island. It very closely resembles the preceding species, from which it is said to be distinguished by the cilia of the hind-wings, which are "partially grey in Leucania moderata, wholly white in L. griseipennis."--(Meyrick.)

The perfect insect appears in February. I am unacquainted with this species.

LEUCANIA TEMPERATA, Walk.

(Bryophila temperata, Walk., 1648 (nec Meyrick). Xylina inceptura, ib. 1736. X. deceptura, ib. 1737. Leucania temperata, Meyr., Trans. N. Z. Inst. xx. 45.)

"Terminal joint of palpi moderate; form of wing as in Leucania griseipennis, first and second lines whitish, inconspicuous, margined with black dots, second line evenly curved, subterminal perceptible; cilia grey, indistinctly barred with white. Hind-wings grey."--(Meyrick.)

Described by Mr. Meyrick from the British Museum specimens.

I am unacquainted with this species.

LEUCANIA NULLIFERA, Walk.

(Agrotis nullifera, Walk., Noct. 742; Butl., Voy. Ereb., pl. ix. 5. Alysia specifica, Gn., Ent. Mo. Mag. v. 3. Leucania nullifera, Meyr., Trans. N. Z. Inst. xix. 7.)

(Plate IV., fig. 9; head, Plate II., fig. 11.)

This large though sombre-looking insect has occurred in the North Island at Taupo and Wellington. In the South Island it has been taken commonly at Mount Arthur, Christchurch, and Rakaia.

The expansion of the wings is from 2½ to 2¾ inches. The fore-wings are uniform dull grey, with a double row of very faint white spots parallel to the termen; the hind-wings, head, thorax, and abdomen are pale grey.

{10}In some specimens the fore-wings are quite destitute of markings, whilst in others the ground colouring varies considerably, and is occasionally dull brown instead of grey.

The larva is very stout, bright yellowish-brown, considerably paler on the under surface; the dorsal line is faintly indicated, the subdorsal and lateral lines are dull brown, with a chain of elongate white spots beneath each; the spiracles and dorsal surface of the posterior segments are black; there are also numerous white dots all over the larva.

This caterpillar feeds on spear-grass (Aciphylla squarrosa), and only a single individual inhabits each clump. It devours the soft, central portions of the tussock, and its presence can generally be detected by a quantity of pale brown "frass," or discoloration, which is generally visible near the bases of the leaves. Owing to the formidable array of spines presented by the spear-grass, this larva can have but few enemies. The presence of these spines makes the insect a difficult one to obtain without special apparatus. A sharp pair of strong scissors, however, will enable the collector to cut off a sufficient number of the "spears" to allow of the insertion of a small trowel or hatchet under the root. The plant can then be lifted out of the ground, and the larva afterwards carefully extracted from its burrow in the stem. These larvæ are full grown about the end of May, which is consequently the best time to obtain them for rearing. The pupa is enclosed in an earthen cell amongst the roots of the spear-grass. The moth appears in November, December, January, February, and March. It is sometimes attracted by light. I have found it commonly on the Tableland of Mount Arthur at elevations of from 3,500 to 4,000 feet above the sea-level, where its food-plant also flourishes.

LEUCANIA PURDII, Frdy.

(Leucania purdii, Frdy., Trans. N. Z. Inst. xv. 195; Meyr., ib. xix. 8.)

(Plate IV., fig. 11.)

This fine species was discovered at Dunedin by Mr. Purdie. A single specimen has also been taken at Wellington.