. Bulletin of the Natural History Museum Zoology. Fig. 1. Medial aspect of maxilla (from Serranochromis macrocephalus), viewed somewhat dorsolaterally, to show points of measurement for: A, preshank length, and B, shank length. Scale bar = 5 mm. The length of the premaxilla's ascending process is mea- sured, directly, from the dentigerous surface of the bone at its symphysis with the premaxilla of the opposite side, to the dorsal tip of the process. The length of the alveolar process uses the same ventral ( dentigerous surface) reference point; its dorsal limit being the highest point on t
. Bulletin of the Natural History Museum Zoology. Fig. 1. Medial aspect of maxilla (from Serranochromis macrocephalus), viewed somewhat dorsolaterally, to show points of measurement for: A, preshank length, and B, shank length. Scale bar = 5 mm. The length of the premaxilla's ascending process is mea- sured, directly, from the dentigerous surface of the bone at its symphysis with the premaxilla of the opposite side, to the dorsal tip of the process. The length of the alveolar process uses the same ventral ( dentigerous surface) reference point; its dorsal limit being the highest point on the dorsal margin of the process (see Fig. 2). STUDY MATERIAL See Greenwood (1979, 1984, 1992) for specimens used in previous studies of Serranochromis, Sargochromis, Chetia and Pharyngochromis. Additional material: Sargochromis coulteri RUSI 26627'. Namibia (4 specimens) Sargochromis coulteri RUSI 36419. Namibia (1 specimen) Sargochromis coulteri RUSI 28106. Namibia (1 specimen) Sargochromis giardi RUSI 35782. Zambia (3 specimens) Sargochromis carlottae RUSI 31204 Namibia (3 specimens) Sargochromis carlottae RUSI 31214 Namibia (2 specimens) Sargochromis coulteri RUSI 31199. Namibia (1 specimen) Serranochromis robustus RUSI 31169. Botswana; Okavango river (1 specimen) Serranochromis thumbergi RUSI 22660. Dam, Empangeni area, Natal (1 specimen presumably an introduc- tion) Serranochromis longimanus RUSI 23877. Botswana; Oka- vango swamps (6 specimens) Serranochromis macrocephalus RUSI 24175. Botswana; Boro river (9 specimens) Serranochromis angusticeps RUSI 26854. Okavango swamps (4 specimens) Chetia brevis Holotype AMG. P. 951. Lomati river, Chetia brevis Paratypes AMG. P. 952. Lomati river, (5 specimens) Chetia brevis AMG. P. 1422. Lomati river, Barbeton district, (3 specimens, one partly skeletonized; see below) Chetia flaviventris AMG. P. 1298. Mogel river, Waterberg, (7 specimens, one partly skeletonized; see below) Chetia flaviventris AMG.
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