On the identity of the spider Emertonius exasperans Peckham & Peckham (Araneae : Salticidae) F. R. Wanless Department of Zoology, British Museum (Natural History), Cromwell Road, London SW7 5BD Introduction The little known genus Emertonius Peckham & Peckham 1892 was formerly comprised of two species : Emertonius exasperans Peckham & Peckham, the type-species from Java and E. rufescens Simon from Madagascar. Both species were known only from females that were characterized by the 'curiously' shaped carapace. E. rufescens, now known from both sexes, is considered to belong to the genus Myrmarachne Macleay and is described elsewhere (Wanless, 1978). The discovery of a male from the Philippines, believed to be conspecific with E. exasperans, shows that this is also a species of Myrmarachne and that the genus Emertonius is not valid. In the following redescription of E. exasperans the format and abbreviations are those given by Wanless (1978). Myrmarachne exasperans (Peckham & Peckham) comb. nov. (Figs 1, 2) Emertonius exasperans Peckham & Peckham, 1 892 : 54, pi. IV, figs 8, 8a, 8b, ? not rf. Female LECTOTYPE (here designated) Java, Bantam (MCZ, Harvard) Examined. Simon, 1901 : 498, 499, 503, 504, fig. 5951. Roewer, 1954 : 939. Bonnet, 1956 : 1653. Proszyriski, 1971 : 400. DIAGNOSIS. M. exasperans is a distinctive species and the form of the carapace (Figs 1A, F; 2A, E) is diagnostic. MALE (formerly undescribed). Carapace (Fig. 1A, F): punctured-reticulate with piliferous papil-lae ; dark reddish brown ; clothed with white hairs forming lateral and submarginal bands on the sides. Eyes: anteriors subcontiguous with apices procurved in frontal view, fringed with white hairs. Clypeus: white haired. Chelicerae (Fig. 1A, D): rugulose with furrows; orange-brown with brown-black lateral keels and with a distal violet sheen under some lights; fang apophysis lacking. Maxillae and labium: yellow-brown. Sternum: (Fig. 1C) yellow-brown. Abdomen: mottled pale yellow and black; scuta dark orange-brown tinged with blackish, sparsely clothed with fine dark orange hairs and margined with distinctive white haired fringes. Legs: femora I slightly enlarged. Light yellow-brown but tibiae I and femora I orange-brown. Ventral spination of legs I: metatarsi 2-2, tibiae 2-2-2-2-2-2, patellae 1. Palp (Fig. IB, E): tibial apophysis with proximal ventral flange; seminal reservoir doubled, probably as a result of folding within the tegulum. Dimensions: total length 5-0 mm, carapace length 2-4 mm. Ratios: AM : AL : PM : PL :: 12 : 7 : 1-4 : 7-5; AL-PM-PL: 9-7; width of eye row I/ carapace width at that point 1-06, width of eye row III/ carapace width at that point 1-08, quadrangle length/ carapace length 0-48, cheliceral length/ carapace length 0-90, tibia + patella IV/ carapace length 0-88 (based on 1 g). FEMALE (Fig. 2A, E). Carapace: covered with piliferous papillae but grading to rugulose behind anterior eyes; dark reddish orange; a longitudinal white haired band on the head and fore part of thorax with white haired lateral bands and a tuft of brownish hairs on the 'hump'. Eyes: more or less as in <$. Clypeus: white haired. Chelicerae: reddish orange, shiny, with 6 promarginal and 8-10 retromarginal teeth. Maxillae and labium: orange-brown. Sternum (Fig. 2B): pale yellow-brown. Abdomen: yellow-brown with dark brown dorsal pattern; light parts clothed with pale yellowish hairs with scanty covering of long and short orange-brown hairs in dark areas. Legs: legs I light yellowish with brownish streaks on outside of tibiae and patellae. Other legs light yellowish but legs IV with brownish streaks on outside of tibiae, patellae, femora and trochanters. Bull Br. Mus. not. Hist. (Zool.) 33 (4): 231-296 Issued 27 April 1978 235
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