Sir William Macleay (1877) described Katophis plumbea gen. et sp. nov. from several from Katow, Papua New Guinea. The species has since been placed in the synonymy of the natricine snakes Tropidonotus picturatus and Amphiesma mairii by Boulenger (1893) and Cogger (1979), respectively. Recently, Malnate and Underwood (1988) revised the New Guinean natricine fauna, recognizing 11 species and 1 subspecies in a single genus, Tropidonophis. However, K. plumbea is not mentioned in their work. Although Macleay's description is brief, the keeled scales, low number of midbody scale rows, and presence of a loreal indicate that K. plumbea is a natricine, and the combination of 15 midbody scale rows, single preocular, and type locality suggest that it is a senior synonym of Tropidonophis mairii brongersmai Malnate and Underwood, 1988. Katow is now known as Mawatta, and is on the Binaturi River in the Western District of Papua New Guinea (Parker, 1982), within the known distribution of only T. m. brongersmai. Goldman et al. (1969) identified four Macleay Museum specimens (MMUS 618-621) as syntypes of K. plumbea. These have since been transferred to the Australian Museum, where they are registered as R3189831901 (Cogger, 1979). I have examined all four specimens, and all agree well with the type description, although none is in perfect agreement with the scale counts and measurements provided by Macleay. The range of variation in scalation and measurements of these specimens is as follows: ventrals 139-143; subcaudals 71 (N = 3), reduction to 6 caudal scale rows at level of subcaudal 11-14, reduction to 4 caudal scale rows at level of subcaudal 33-39; supralabials eight (seven on one side of one specimen); preocular single (divided on one side of one specimen); anterior temporals one (50%, N = 8) or two; upper postocular separated from anterior temporals; posterior temporals two; snout-vent length 443-535 mm; and tail length 140-170 mm (N = 3). All characters are in agreement with T. mairii brongersmai. Accordingly, the following synonymy is proposed:
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