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Figures in brackets are number of specimens.

Pachyrhamma fusca is most closely related to P. waitomoensis, but differs from it in.

1 The presence of spines on antennae of mature male.

2 A greater number of linear spines on hind femora.

From the same tunnels from which P. fusca was collected, twenty-five specimens of another species, also belonging to the genus Pachyrhamma, were collected. They are considered to be new and are described as follows:

Pachyrhamma uncata n. sp. Plate 5, Figs. 1, 2 Text-fig. 2, Figs. 1–5.

Colour. Basic colour deep ochreous, with pronotum, mesonotum, metanotum and abdominal terga irregularly mottled with dark brown and medium brown. Anterior margin of pronotum and lateral margins of pronotum, mesonotum and metanotum ochreous; femora and tibiae of all legs transversely banded with broad bands of light brown interspersed with narrow bands of ochreous; tarsi pale ochreous, antennae light brown; ovipositor deep reddish-brown.

Body. Length up to 28 mm in male and 25 mm in female; average length 24 mm in male and 23 mm in female. Body sparsely clothed with setae. Ovipositor subequal in length with body. Antennae approximately 5.7 times as long as body. Fastigium rising abruptly, as high as long Maxillary palps with third and fourth joints subequal in length.

Antennae. Scape about four times as large as pedicel, which is narrower than scape, but broader than other segments; third segment on dorsal and vential aspects narrower than pedicel and twice as long. From fourth segment onwards segments unequal in length, although steadily decreasing in size, all segments thickly clothed with short setae. Sexual dimorphism poorly developed, antennae of male slightly stouter and longer than those of female; no spines present on flagellum of male or female.

Legs. Fore and middle legs subequal in length, with hind leg approximately twice length of fore and middle legs. Sexual dimorphism is shown by fore and middle legs of female

being 0.7 as long as male, and hind legs of female 0.6 as long as male Femora, tibiae and two proximal segments of hind tarsi armed with vanable numbers of spines (Table II). No spines occur on fore or middle tarsi. Length of proximal segment of hind tarsus subequal, with length of other three segments together. Sexual dimorphism is shown in the spination of the hind femora, the more proximal portion of the prolateral margin of the male bearing three laterally directed, enlarged hooked spines, while in the female they are smaller and posteriorly directed. Ratios of length of legs to length of body: Fore leg, male 2.3:1, female 2:1 Middle leg, male 2.3:1, female 1.9:1 Hind leg, male 5:1, female 3.6:1.

Genitalia. Female: Suranal plate, Fig. 1 (SAP), convex laterally, straight distally distal margin clothed with two groups of setae. Subgenital plate, Fig. 2 (SGP), concave laterally with V-shaped notch distally; sparsely clothed with short setae. Male: Suranal plate, Fig. 3 (SPL), with straight margins, the lateral ones tapering distally; distal margin with a fringe of short setae. Subgenital plate, Fig. 4 (H), triangular, 1.1 wider than long, sides spreading slightly proximally, tapering to concave distally with a rounded apex, glabrous on dorsal side, but with apical protuberance on ventral surface thickly clothed with short setae. Two styli, Figs. 3, 4 (S), thickly clothed with short setae, length of styli being 0.3 length of sternite IX (SIX). Subgenital plate covers genitalia. Parameres, Fig. 5 (P), attenuated,

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Figures in brackets are number of specimens. broad at base and tapering to a point, 1.2 broader than long, prolateial margin thickly clothed with long setae, rest of paramere clothed with short setae. Pseudosternite, Fig. 5 (PD), 1.1 wider than long, tapering to a point distally, Penis, Fig. 5 (PN), two-lobed, each lobe 1.8 longer than broad. Paraprocts, Figs. 4, 5 (PP), elongate, 1.8 longer than broad.

Locality. Gold-mining tunnels, Thames (type locality), coll. A. M. Richards.

Types. Holotype male, Allotype female and Paratype male and female in Auckland Institute and Museum Collection. Paratype male and female in British Museum (Nat. Hist.) Collection. Paratype male and female in Dominion Museum Collection.