[Read before Wellington Philosophical Society, June 23, 1937; received by Editor, June 26, 1937; issued separately, December, 1937.]
With the publication of his paper in Trans. Roy. Soc. N.Z., vol. 66, pt. 3, Womersley brought the number of Collembola known from New Zealand up to fifty-four, of which twelve only are peculiar to this country. It is the purpose of the present paper to add to this number ten more species, nine of which, including one genus, are new to science. The type material is located in the Dominion Museum, Wellington.
For the purposes of description the word “body” as used herein refers to the head, thorax, and abdomen without the appendages, and, similarly, the word “trunk” to the thorax and abdomen only.
Order Collembola Lubbock.
Suborder Arthropleona Börner.
Superfamily Poduroidea Till. Womersley.
Family Hypogastruridae Börner.
Subfamily Achorutini Börner.
Tribe Achorutini Börner.
Genus Achorutes Templ.
Achorutes viaticus Tullberg.
This almost cosmopolitan insect was first recorded from the New Zealand region at Macquarie Island (Sub-Ant. Isds. N.Z., vol. 1, p. 377). I am now able to record the species from the mainland, where it was first obtained at Foxton among rushes near the Mana-watu River mouth in March, 1932. Other localities since recorded include Island Bay, Wellington, from amongst rushes near high-water mark, November, 1932, and from amongst rushes and grasses at the mouth of the Makara Stream, March, 1937.
Family Onychiuridae Lubbock.
Subfamily Onychiurinae Börner.
Genus Onychiurus Börner.
Onychiurus makarensis sp. nov.
Description: Body 0.6–1 mm. in length, white in colour and sparsely covered by short hairs. Segmentation is distinct, the relative lengths of the trunk segments being as 2.5:6.5:6:5:5:6.5:3:3. A pair of anal horns and the ventral tube are present; but the furcula is absent. The antennae are four-segmented, short, hardly equalling the head in length, the ratio of their segments being as 1:1:1:2. Each leg terminates in a well-developed superior claw and a smaller inferior claw, both unarmed. The claw of the forefoot is relatively much smaller than those of the other feet. Ocelli are absent; but a pair of pseudocelli occurs at the base of each
antenna. A post-antennal organ is situated in a transverse groove down each side of the head and consists in each case of twenty-six prominences arranged in two parallel rows of thirteen each. The sense organ on antennae III is well developed and protected by seven strong spines.
Localities: Found always amongst the roots of grasses and rushes growing near the sea coast, in 1932 at Makara, and in March, 1937; at Orongorongo.
Superfamily Entomobryoidea Till. Wom.
Family Isotomidae Schäffer.
Subfamily Isotominae Schäffer.
Tribe Isotomini Börner.
Genus Isotoma Bourlet.
Isotoma parva sp. nov.
Description: Body 1.2–1.5 mm. in length, dull reddish brown to purple brown in colour, with pale purple to bluish purple appendages. Scales are absent; but the cuticle over the whole insect has a finely granulated appearance. Short, slender hairs occur all over the body with occasional longer setae, especially around the posterior region. The ventral tube is long and stout, swollen at its distal end, and invested with a few short hairs. Segmentation is distinct, the trunk segments being related in length as 10:7:4:6:11:9:5:4. The tergum of the mesothorax completely covers that of the prothorax. Abdomen IV and III approximately equal in length, or III a little longer than IV. The antennae four-segmented and approximately half as long as the trunk. The segments related in length as 7:11:11:15. Ocelli eight on each side, uniformly large, and regularly arranged. The superior claws of the feet are unarmed on their inner margins; but each bears a short external spine. The inferior claws short and acutely truncated. The dentes twice as long as the manubrium, prominently corrugated ventrally and provided on each side with a double row of slender spines. Mucrones tridentate each with a central conical tooth, a terminal, almost vertical, tooth, and a proximal lateral oblique tooth.
Localities: In leaf mould on the floor of native bush at Akatarawa (1933), and at Butterfly Creek, Wellington (1933).
Family Lepidophorellinae Börner.
Tribe Lepidophorellini Schäffer.
Genus Lepidophorella Schäffer.
Lepidophorella australis Carpenter.
Further localities for this species are: in native bush at Akatarawa (1933); Butterfly Creek, Wellington (1932); the Urewera country from Lake Waikaremoana to Te Whaiti (1937); and in open and bush country in the Manawatu district (1933). In all localities the species is quite common.
Lepidophorella communis sp. nov.
Description: Body 3.5–4 mm. in length, more or less completely clothed with scales. The colour varies from pale cream to jet iridescent black according to the denseness of the clothing of scales.
The scales are easily rubbed off, and specimens may be found in all intermediate stages and exhibiting, accordingly, varying degrees of colour pattern. The tergum of the mesothorax completely covers that of the prothorax. A tuft of short stout bristles occurs at the apex of the tergum of the mesothorax. Most of these are clavate, branching at their tips into from three to seven short, finger-like processes. Occasional slender setae occur on the head and trunk especially towards the posterior region. The ventral tube is elongate, extensible, bilobed at its distal end and invested with a few short hairs. Tenaculum bifid and situated on the posterior half of the third abdominal segment. Segmentation of the trunk moderately clear, the ratio of Th. 1 and 2: III: Abd. 1:2:3:4:5:6 being as 16:9:4:5:7:6:5:2. The antennae are four-segmented, the segments 1:2:3:4 being as 5:11:11:14. The terminal antennal segment is generally scaled on the lower half and clothed with short slender hairs. About one-third back from the tip there is a small sense organ consisting of a ring-like swelling from the centre of which projects a minute papilla. Eight large, regularly-arranged ocelli on each side, post-antennal organ wanting. Foot claws similar, the superior claw of each foot being tridentate along its inner margin and provided with an external basal spine. The inferior claw about two-thirds the length of the superior claw, lanceolate and acuminate. Furcula clothed with short, stout setae and occasional long hairs. The dentes slightly longer than the manubrium, strongly corrugated ventrally, mucrones simple, each with a single upturned terminal tooth and with or without a basal scale.
Localities: In open country and native bush at Karori, Wellington (February, 1932); in native bush at Akatarawa (1933–37); from open and bush country in the Manawatu district (1933); from the Urewera country in native bush from Lake Waikaremoana to Te Whaiti (1937); from native bush near Rotorua (1937). This insect is exceedingly common wherever it is found. It appears to be one of the commonest of the New Zealand Collembola.
Lepidophorella longiterga sp. nov.
Description: Body 2–4.5 mm. in length. Colour ochreous brown with dark brown dorsal band and dark brown edges to the terga. The mesothorax is relatively enormous, extending above, and halfway over, the head, being two and a-half times as long as the meta-thorax. It is provided at the apex, but on the inner surface only, with a tuft of long, thin, stiff bristles. Antennae four-segmented, one and a half times the length of the mesothorax, and darker brown towards the tips. Scales are present over the body; but the covering is not very heavy. Abdomen III approximately twice the length of Abdomen IV. Ocelli eight on each side; no post-antennal organ. Foot claws similar to L. communis, the upper tooth being slightly smaller than the lower two. The inferior claw with two small basal teeth on the outer edge. Furcula similar to L. communis.
Localities: One specimen taken at Karori, Wellington (1932). Apparently distributed throughout the Urewera country, where it was taken during February, 1937, at the following localities: Te Whaiti, Waihui Gorge, and on the shores of Lake Waikaremoana
at an altitude of 2,050 feet. All specimens found amongst leaves on the floor of the native bush.
Family Entomobryidae Schäffer.
Subfamily Entomobryinae Börner.
Tribe Entomobryini Börner.
Genus Entomobrya Rondani.
Entomobrya assymetrica sp. nov.
Description: Body 0–8–1 mm. in length, pale lemon-yellow in colour with a patch of pale orange on dorsal surface of Abd. VI and on the ventral surface of the head. Naked of scales and almost devoid of hairs. The tergum of the mesothorax carries at its apex a tuft of stiff bristles. Segmentation of trunk not distinct but Th. 1:2:3: Abd. 1:2:3:4:5:6 being as 2:9:6:4:5:6–5:15:2:2. Antennae four-segmented, lightly clothed with hairs which are denser on the terminal segment. The relative lengths of the segments are as 6:8:7:14. Ocelli eight on each side. Each ocellar group is asymetrically arranged as two unequal collateral groups of five and three, respectively, the larger being external, and the whole set in a triangular mass of black pigment with its apex directed posteriorly. The superior claws of the feet are simple, curving gently towards the apex. Inferior claws about two-thirds the length of the superior and acuminate. Furcula slender, reaching forward to the thorax. Dentes and manubrium about equal in length, dentes corrugated ventrally, mucrones bidentate, the distal tooth long and curved, the proximal stouter and conical.
Locality: In open country in the Manawatu District near Newbury.