| 1. | The snake has an entire anal plate and single subcaudals.
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| 2. | The ventrals are 221-239 . The anal plate is entire.
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| 3. | The ventral scales are rounded, and the anal plate is single.
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| 4. | The dorsal scales are weekly keeled, and the anal plate is entire.
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| 5. | Ventral scales are 147-148 in number; the anal plate is entire.
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| 6. | Ventrals 127-151; anal plate divided; subcaudals divided 59-79.
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| 7. | anal plate is divided in Arizona specimens, but is entire in South American specimens.
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| 8. | Ventrals 142-144; anal plate entire; subcaudals 75-77, divided.
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| 9. | Ventrals 178; anal plate divided; subcaudals also divided ( in two rows ).
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| 10. | Ventrals 132-142; anal plate divided; subcaudals 51-71, divided.
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