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Appendix 1. Material for which skulls were prepared: 



Dispholidus typus (NMZB-UM 3058; NMZB 922, 1350, 1658, 

 3322, 10870, 13378); Rhamnophis aethiopissa (NMZB 10793, 

 16726); Rhamnophis batesii (NMZB 13206); Xyelodontophis 

 uluguruensis (NMZB 7443 - holotype); Thelotomis capensis 

 (NMZB-UM 88, 16199. 17922); Thelotomis kirtlandii (NMZB 

 32185); Thelotomis mossambicanus (NMZB-UM 3058; NMZB 

 11390); Thelotomis usambaricus (NMZB 15629); Thrasops 

 flavigularis (NMZB 16725); Thrasops jacksonii (NMZB 10717). 



Appendix 2. Material examined internally: 



Dispholidus typus (BMNH 1979.205; FMNH 58379; IRSL 2 un- 

 numbered; IRSNB 13281a-b, MCZ 18223, 32475, 32478, 53458, 

 53730-31, 55250, 55255, 67927), Dispholidus 'pemba' (MCZ 

 45587), Hapsidophrys lineatus (BMNH 1979.165-67; IRSL 15 

 unnumbered; SDSU unnumbered; UNAZA 4 unnumbered; VW 

 1010), Hapsidophrys smaragdinus (BMNH 1979.157-59; FMNH 

 179036; IRSL 14 unnumbered; MZUSP 8159; PEM 3363, 3403; 

 UNAZA 4 unnumbered; VW 907, 1012, 1026, 1068, 1099), 

 Philothamnus angolensis (IRSL 23 unnumbered; MZUSP 8 1 74-75, 

 8 177; NMV D55548; PEM 3382-83; SDSNH 63865-66; UF52485, 

 80395-99, 80671; UNAZA 4 unnumbered; VW 1086, 1197, 1211, 

 1254, 1429-30, 1451, 1745, 1986-87, 1990, 2226; ZRC 2.3427), 

 Philothamnus bequaerti (MCZ 47846), Philothamnus carinatus 

 (UNAZA 2 unnumbered), Philothamnus dorsalis (UNAZA 2 un- 

 numbered). Philothamnus heterodermus (UNAZA 1 unnumbered), 

 Philothamnus heterolepidotus (LSUMZ 40781), Philothamnus 

 hoplogaster (BYU 30895). Philothamnus macrops (MCZ 23244), 

 Philothamnus nitidus (UNAZA 1 unnumbered), Philothamnus 

 occidentalis (VW 6360), Philothamnus punctatus (MCZ 52666), 

 Xyelodontophis uluguruensis (NMZB 7443; ZMB 48153), 

 Rhamnophis aethiopissa (IRSL 6 unnumbered; MCZ 1 3607, 258900. 

 38392, 48343, 178494; SDSNH 63873; SDSU unnumbered), 

 Rhamnophis batesii (IRSNB 28 1 3; MCZ 1 3604, 38393), Thelotomis 

 capensis (FMNH 191 163; MCZ41963, 44581, 69036;ZMB 23526), 

 Thelotomis kirtlandii (FMNH 205972, 214828; IRSL 1 unnum- 

 bered; IRSNB 5370, 5371a-b, 6451, 6454; MCZ 22523, 49687. 

 49734, 51835; SDSU unnumbered; ZMB 21627), Thelotomis 

 mossambicanus (FMNH 248040; MCZ 51628, 56922; ZMB 16783, 

 2800 1 ), Thelotomis usambaricus (MCZ 23349; ZMB 1 6786, 2 1 1 30), 

 Thrasops flavigularis (MCZ 8776-77: MHNG 967.20, 1520.68, 

 1520.75, 1520.78), Thrasops jacksonii (BMNH 1979.190-91; UF 

 52476; MCZ 25954; MZUSP 8178-79; UNAZA 5 unnumbered; 

 VW 1077, 1083, 1230, 1232, 1965, 2350), Thrasops occidentalis 

 (MCZ 55232; UG C34P12). Thrasops schmidti (MNHN 1940.197, 

 1974.1; NRM 2297b). 



