Diagnoses of genera of South East Asia: Cryptic salticids, mottled brown or grey, stealthy and not seen to jump. on tree trunks and mossy rocks in rainforest. General remarks: Salticids in this group tend to be very cryptic and live in rainforest habitats although some specimens have been collected in gardens near rainforest. Those, such as some Spartaeus species, live on tree trunks and are difficult to spot. These can often be induce give themselves away by the collector moving his hand over an area close to the tree trun (a technique often used by entomologists). This long-legged spider does not jump but moves smoothly and quickly to another position - and even then can be difficult to spot. Large trees with buttresses, rather than those with plain rounded bases, seem to be preferred. A colony Neobrettus was found among dead fronds on a banana free. The first impression gained was one was looking at a rotting frond with small patches of grey mould starting to grow. In life, grey hairs on these small salticids stand up on end much as one sees in certain style of modern hair style. However, it is more likely that the spider is actually mimicking a particularly unsavoury caterpillar. Not a great deal is known about the biology of this unusual group. No doubt, more information would be both rewarding to the observer and much appreciated by arachnologists in general. Genus: Spartaeus. See also Koh, p. 126. Spartaeus is a small genus which is beginning to grow in numbers. They have probably been overlooked in the past because, on their chosen background, their excellent cryptic appearance renders them almost invisible. Any spider which lives on tree trunks, rocks etc. is, of necessity, cryptic. The cephalothorax is moderately high with the flattish cephalus sloping gradually to the front from the rear eyes and then dropping steadily just behind the rear eyes to the posterior edge. In plan the carapace is oval, widest just behind the rear eyes and then rounded posteriorly. It is orange-brown in colour, mottled black and has a broad yellow, median band on the thorax. This band starts at the level of the rear eyes and tapers strongly to the rear edge. The eye surrounds are black. The abdomen is a rather elongate oval, wide anteriorly and gradually tapering near the spinnerets. The abdomen is noticeably narrower than the carapace. It is pale yellow in colour with black markings. The spiny legs are very long and slender. Legs I are yellow-brown with occasional dark markings except for the all yellow tarsi. The other legs are yellow to yellow-brown with the tarsi and metatarsi tinged with black apically. Legs are clothed in feathery hairs which can be useful for breaking up any shadows they may produce when at rest on the tree trunk. Distribution: Spartaeus is known from Sri Lanka, Thailand, P. Malaysia, Sumatra, Java, Amboina, the Philippines and probably S. China. Murphy & Murphy 2000: 328. By courtesy of the Authors' and the Malaysian Nature Society.