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Lethrinus nebulosus (PI. 2 D, Fig. 5 C, D): dark body markings moderately-intense, shoulder blotch circular or square; more than 4 narrow primary stripes, pale blue, mostly indistinguishable at less than 40 mm, interspaces off-white to yellow-tan; operculum off-white silver or yellow-tan; spinous fin membranes with moderately-dense melanophores. Lethrinus obsoletus (PI. 2 E-G, Fig. 5 B, C, E): dark body markings usually intense; shoulder blotch square or vertically-rectangular; primary stripes 3 - 4, orange-tan, pectoral stripe wider than others, visible at greater than 20 mm, interspaces off-white; operculum silvery off-white; spinous fin membranes mostly hyaline. These combinations of field colours will allow most L. lentjan juveniles to be separated from L. obsoletus at greater than 20 mm, and from L. nebulosus at greater than 40 mm. Nonetheless, at less than 40 mm, the collection of specimens for examination of colours displayed when freshly killed, or to allow them to be grown to a larger size in aquaria, is recommended.