A revision of the spider genus Marengo (Araneae : Salticidae) F. R. Wanless Department of Zoology, British Museum (Natural History), Cromwell Road, London SW7 5BD Introduction The genus Marengo Peckham & Peckham, 1892 is represented in both the Oriental and Ethiopian regions and at present includes nine known species. Seven species occur in the Oriental region, including the type-species Marengo crassipes Peckham & Peckham from Sri Lanka and also M. grammicus (Simon), from the Philippines, the type-species of Philates a poorly known genus regarded here as being synonymous with Marengo. The Ethiopian region was formerly repre-sented by two species revised by Roewer (1965). They are now considered to be conspecific, but the number of species in the Ethiopian region remains unaltered as a new taxon from Angola is described in this present paper. The measurements were made in the manner described by Wanless (1978) and for the leg spination the system adopted is that used by Platnick and Shadab (1975). Marengo spiders resemble ants and pseudoscorpions in appearance, but their biology is un-known. Most species have the first pair of legs grossly enlarged and would appear to form a good monophyletic group although new taxa from Singapore and Borneo are somewhat divergent in body form. The species can be readily separated by the carapace shape and sculpturing, ab-dominal pattern and genital structures. Intraspecific variation is apparently not marked, apart from minor differences in the conformation of the epigynal ducts. Genus MARENGO Simon Marengo Peckham & Peckham, 1892: 66. Type species Marengo crassipes Peckham & Peckham, by monotypy. Simon, 1901 : 488, 491, 492. Petrunkevitch, 1928 : 182. Roewer, 1954 : 938. Bonnet, 1957 : 2714. Roewer, 1965 : 30. Philates Simon, 1900 : 402. Type species Philates grammicus Simon, by original designation. Simon, 1901 : 489, 491-493. Bonnet, 1958 : 3537. Petrunkevitch, 1928 : 183. Roewer, 1954 : 938. Syn. n. DEFINITION. Small spiders ranging from about 2-6 to 4-0 mm in length. Sexes alike in general body form but males with dorsal abdominal scuta and slightly heavier first legs. Colour patterns sometimes present, but usually less distinct in males; not hirsute, carapace often with several scanty patches of white hair. Carapace: shape variable, sculpturing variable, fovea lacking. Eyes: usually in three rows, rarely four; contiguous or subcontiguous with apices from slightly procurved to strongly recurved; middle row about midway between anterior lateral and posterior lateral eyes or nearer to anterior laterals; posterior row wider than anterior row; quadrangle length between 37 and 44 per cent of carapace length. Clypeus: low, backwards sloping. Cheli-cerae: small to medium; more or less subvertical, and usually set well back; promargin with 1-3 teeth, retromargin with 3-5, closely set. Maxillae: parallel or convergent. Labium: subtriangular. Sternum: elongate scutiform. Pedicel: short to long, not always visible in dorsal view, anterior dorsal and ventral segments usually well developed with posterior segment vestigial. Abdomen: shape variable, scuta sometimes present; spinnerets subequal in length, more or less in three rows, anteriors and medians slender, posteriors robust; tracheae (Fig. 4A) rather stout, branched and arising from transverse slit just in front of spinnerets and extending into cephalothorax; colulus apparently lacking. Legs: first pair usually massive with ventral fringe of stiff hairs on tibiae; remaining legs slender; formula 4123, 4132, 1423, 1432; spination: dorsal spines sometimes present on femora, lateral spines usually lacking, ventral spines present on metatarsi I-II but absent on III-IV. Spine sockets of legs I usually with well developed flanges (PI. 3f). Claw tufts Bull. Br. Mus. not. Hist. (Zool.) 33 (4): 231-296 Issued 27 April 1978 259
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