A revision of the spider genus Bocus Simon (Araneae : Salticidae) F. R. Wanless Department of Zoology, British Museum (Natural History), Cromwell Road, London SW7 5BD Introduction The genus Bocus Peckham & Peckham, 1892 is known only from the Philippines and is repre-sented by the type-species Bocus excelsus Peckham & Peckham and B. philippinensis sp. n. B. flavus Simon, known from the lectotype male and one female, is here regarded as a small pale coloured form of B. excelsus. Bocus species are ant-like in body form and closely resemble Myrmarachne Macleay but the structure of the epigyne and the development of the intercoxal plates (cp) and sternum (Fig. 3C, D) suggest that Bocus is a good monophyletic genus. However, its affinities are uncertain as other ant-like genera in the Oriental region have yet to be revised. Genus BOCUS Peckham & Peckham Bocus Peckham & Peckham, 1892 : 38. Type-species Bocus excelsus Peckham & Peckham, by monotypy. Simon, 1901 : 501, 503, 505. Roewer, 1954 : 939. Bonnet, 1955 : 892. DEFINITION. Ant-like spiders ranging from about 5-5 to 11-5 mm in length. Males sexually di-morphic. Colour markings subdued; not hirsute. Carapace: elongate with postocular constriction emphasized by scanty white haired bands and with one pair of trichobothria dorsally; sculpturing usually papillate; fovea lacking. Eyes: anterior row subcontiguous with apices procurved in frontal view; middle row more or less midway between anterior lateral and posterior lateral eyes; posterior row slightly wider or slightly narrower than anterior row; quadrangle length between 27 and 33 per cent of carapace length. Clypeus: very low. Female chelicerae: normal with 3 pro-marginal and 4 or 6 retromarginal teeth. Male chelicerae: strongly developed, elongate and more or less horizontal; spurs absent; fang slightly sinuous, apophysis lacking; teeth numerous. Maxillae: elongate, blades more or less rounded; subparallel. Labium: elongate, median keel lacking. Sternum: long and narrow or anteriorly modified by fusion with intercoxal plates II Fig. 3D). Pedicel: elongate, anterior segments slightly longer than posterior one. Abdomen: elongate ovoid, constricted at anterior third; scuta present in males, lacking in females; spinnerets compact, subequal in length, anteriors more robust; tracheal spiracle a transverse slit just in front of anterior spinnerets; position of colulus not evident (in specimens at hand). Legs: slender, tarsi I sometimes slightly compressed laterally; formula 4132; spination: dorsal and lateral spines absent; ventral spines present on legs I-II, lacking on legs III-IV; claw tufts present, apparently scanty on legs I; scopula lacking. Female palp: palette shaped, fringed with fine preening setae. Male palp (Fig. 3 A, B, E, F) : tibial apophysis not hooked, base sometimes forming a slight flange; embolus long, moderately slender, with two turns around tegulum; tegulum subcircular with large seminal reservoir, pars pendula present; conductor and median apophysis absent; proximal ectal margin of cymbium unmodified. Epigyne (Fig. IF, G): comparatively simple with indistinct openings separated by a septum; median pouch present; primary and secondary spermathecae simple, connected by distinct seminal ducts. The structure of the epigyne although simple is not entirely understood as there is no obvious route for spermatozoa to reach the spermathecae. The opening for the reception of the embolus and the ducts leading to the spermathecae are not evident. DIAGNOSIS. Bocus may be separated from other Oriental ant-like Salticidae by the form of the sternum (Fig. 3D) or the presence of well-developed intercoxal plates I and II (Fig. 3C). Bull. Br. Mus. not. Hist. (Zool.) 33 (4): 231-296 Issued 27 April 1978 239
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