| 1. | No internal skeleton is known, outside of the head shield.
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| 2. | The head shield has two pairs of long rearward spikes.
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| 3. | The head shields and the dorsal scales may be edged with black.
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| 4. | All the aesthetascs project beyond the anterior margin of the head shield.
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| 5. | The head shields are smooth or slightly rugose.
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| 6. | There were also a pair of large extensions at the front of the head shield.
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| 7. | The front edge of the pronotum ( head shield ) has a pale white band.
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| 8. | The nostril pierces the center of the nasal scale and the head shields are rugose.
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| 9. | Most head shields are small and smooth.
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| 10. | Species of " Boreaspis " were very small, with head shields about long.
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