If I am thinking of the same source, that would be Ptyas carinata, not E. carinata. However, I would not be surprised if both species were capable of such a feat.
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Current snakes:
0.0.1 Gonyosoma oxycephala - Java locale (green)
1.2 Gonyosoma oxycephala - Jave local (green)
2.2 Gonyosoma janseni - Seleyar locale (all black)
1.2 Gonyosoma janseni - Celebes locale (Black & Tan)

