Key to Tropical Drymarchon Species

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: : The key to the tropical subspecies of Drymarchon from Neotropical Catalogue of Reptiles, Squamata (Peters and Orejas-Miranda 1970): : : 1. Dorsal pattern uniformly black-------------------2 : : Dorsum with some pattern, not uniformly black----3 : : 2. Tail and venter not reddish----------------------corais : : Tail and venter reddish--------------------------rubidus : : 3. Dorsal pattern light brown at least anteriorly---4 : : Dorsal pattern black with irregular grey transverse bands, : : dim or indistinct anteriorly, more prominent posteriorly : : and on tail--------------------------------------margaritae : : 4. Dorsal pattern uniform light brownish------------unicolor : : Dorsal pattern in dark brown more intensive on posterior : : third of body and entire tail--------------------melanurus : : This key does not include couperi, erebennus or orizabensis whose ranges fall outside of the true tropics.

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