The author has also been able to examine a pair of the insects collected by Reischek from Coromandel in 1891, and labelled by Karny as Pleioplectron cavernae Hutton. These specimens are much larger than both M. filifer Walker and P. cavernae Hutton, and are markedly different. In 1958, the author was fortunate to collect twenty-one specimens of the same species as Reischek from gold-mine tunnels near Thames. This is considered to be a new species and in no way related to Pleioplectron cavernae. Thus Karny's determination is incorrect. The species is described as follows: Genus Pachyrhamma. Brunner, 1888 Pachyrhamma fusca n. sp. Plate 5, Figs. 3, 4, 5. Text-fig. 1, Figs. 1–5 1930 Pleioplectron cavernae Hutton, Karny, Ann. Nat.-Hist. Mus. Wien, 44: 182–185, Fig. 143. Colour. Basic colour medium brown, with anterior and posterior borders of pronotum and posterior borders of mesonotum, metanotum and abdominal terga dark brown; femora of all legs medium brown with transverse ochreous bands at proximal ends, tibiae mid brown proximally, changing to ochreous distally, tarsi ochreous, antennae medium brown, ovipositor reddish-brown. Body. Length up to 30 mm in male and 26 mm in female, average length 26 mm in male and 23 mm in female. Body sparsely clothed with setae. Ovipositor subequal with length of body. Antennae approximately seven times as long as body. Fastigium as high as long, rising abruptly, with base touching scape of antennae Maxillary palps with third and fourth segments 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 aspect narrower than pedicel and twice as long, and on ventral aspect half as long again; from fourth segment onwards segments unequal in length, although steadily decreasing in size; all segments thickly clothed with short setae. Sexual dimorphism present in antennae, male possessing longer, stouter antennae than female, middle portion of flagellum in male armed with a number of short, blunt dorsal spines (Plate 18, Fig. 5), each spine borne on a swelling on the upper part of its segment, variability in number of spines present is common, but is most frequently nine, female never possesses spines. 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 0.75 as long as male, and hind legs of female 0.64 as long as male. Femora, tibiae and proximal two segments of hind tarsi armed with variable numbers of spines (Table 1). No spines occur on fore or middle femora and tarsi. Length of proximal segment of hind tarsus greater than other three together in male, subequal with other three in female. Ratios of length of legs to length of body: Fore leg, male, 2. 1:1; female, 1.8:1. Middle leg, male, 2.1:1; female, 1.8:1. Hind leg, male, 4.5:1;, female, 3.3:1. Genitalia. Female: Suranal plate, Fig. 1 (SAP), concave laterally, rounded and notched medianly distally; distal margin clothed with short setae. Subgenital plate, Fig. 2 (SGP), deeply notched distally and sparsely clothed with short setae. Male: Suranal plate, Fig. 4 (SPL), slightly convex laterally, straight distally, bearing two groups of setae. Subgenital plate, Fig. 3 (H), triangulate, as wide as 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 0.2 length of sternite IX (S IX). Subgenital plate covers genitalia Parameres, Fig. 5 (P), attenuated, broad at base and tapering to a point, 2.5 longer than broad, prolateral 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 1.5 longer than broad Paraprocts, Figs. 3, 5 (PP), elongate, 1.6 longer than broad. Locality. Gold-mining tunnels, Thames (type locality), coll. A. M. Richards, 1958; tunnels Coromandel, coll. Reischek, 1891. 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 Vienna Museum Collection.