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Female
Length, 13.04 mm.
Colouration. Carapace tawny-orange darkening to red anteriorly. Vague reddish stripes running from the thoracic groove towards each leg. Thoracic groove dark red. A slight sootiness intensifies the stripe running towards Leg I along the cephalic margin. Abdomen dark with many white spots dorsally but anteriorly the dark shade is almost entirely due to the many black hairs. The pattern is of 5 pairs of dark spots on the posterior two-thirds of the abdomen, and a faint dark cross between the first two pairs of spots. Ventrally two broad bands edged with paler bands run longitudinally. Spinnerets pale brown. Sternum yellow-orange with redder edge. Legs yellow-orange-white, more cuticularised edges orange. Legs without rings.
Maxillary Lobes and Lip. Dark orange with white tips and black around the bases.
Chelicerae. Dark red, nearly black.
Carapace. Length, 6.20 mm; breadth, 4.42 mm. Elongated Thoracic groove long, half in posterior triangle. Many small black spines over dorsal part and down edges of posterior triangle, and long ones in three bands from the thoracic groove to the eyes. Two transverse lines of spines posterior to the eyes. Cephalic portion merges with thoracic without a deep groove.
Eyes. 8, in two rows. From above, anterior row straight, posterior row procurved; from in front, anterior row straight, posterior row procurved. Ratio of eyes: AM:AL:PL:PM = 171:262:263:231. Breadth of ocular area: 2.06 mm. Width clypeus, 484. Distances apart: AM-AM, 394; AM-AL, 468; AL-PL, 162; PL-PM, 698; PM-PM, 560; AM-PM, 531. Lateral eyes on a tubercle.
Chelicerae. Kneed. Strong with prominent smooth boss. Many spines and hairs prolaterally and a few retrolaterally. Prolateral teeth 3, the middle one being largest, the other two of similar height. A sharp unserrated ridge runs medially down the distal halves of the chelicerae ending in the first tooth. Two small retrolateral teeth, the more ventral one being larger and situated opposite the space between 2nd and 3rd prolateral teeth. A large flange protects the fang base. Groove of slight slope, 30°. Scopula thick.
Lip. Longer than broad. Indented at base, notched at tip. Narrows distally.
Sternum. Length, 3.17 mm; breadth, 2.44 mm. Convex but nearly flat medially. A slight protuberance opposite each coxae. Anterior margin concave with lateral straight pieces opposite the maxillary lobes. A posterior spine, narrow and sharp, separates the IV coxae.
![Thumbnail: [Volume 87, 1959 page 341]](/journals/rsnz/images/rsnz_87/thumbnails/rsnz_87_03_0393_0341_ac_02.gif)
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Legs. 1/3.1 4/2.7 2/2.6 3/2.3 Palp/1.0
| Femur | Pat. & Tibia | Metatarsus | Tarsus | Total | |
|---|---|---|---|---|---|
| I | 5.11 | 7.11 | 5.06 | 1.83 | 19.11 |
| II | 4.67 | 5.94 | 4.00 | 1.61 | 16.22 |
| III | 4.06 | 5.28 | 3.44 | 1.39 | 14.17 |
| IV | 4.72 | 6.17 | 4.39 | 1.44 | 16.72 |
| Palp | 2.17 | 2.22 | — | 1.89 | 6.28 |
Tibial Index: I, 9.5; IV, 8.5.
Calamistrum. ⅕th length of metatarsus. Not very dense.
Abdomen. Length, 7.50 mm; breadth, 5.28 mm. Cribellum divided, breadth, 0.33 mm. Epigyne: Length, .83 mm; breadth, 1.11 mm.
This subspecies differs from I. chathamensis chathamensis in the details of the epigyne, in having a darker, more even colouration, and in size. It is very similar in many respects to I. r. mckerrowi. As it is recorded from one locality some doubt is permissible on the validity of the subspecies.
I. rubrioides mckerrowi n. sub. sp. Text-fig. II, fig. 8.
Distribution. Two females from Lake McKerrow.