species, though the gap between them was
that between highly civilized man and the jungle ape. The runners were
harmless and shy, but they were noted also for clinging stubbornly to
one particular district generation after generation. To find such a
clan on the move into new territory was to be fronted with a puzzle it
might be well to investigate.

"A snake-devil--" he suggested tentatively, forming a mind picture of
the vicious reptilian danger which the colonists tried to kill on
sight whenever and wherever encountered. His hand went to the knife at
his belt. One met with weapons only that hissing hatred motivated by a
brainless ferocity which did not know fear.

But Sssuri did not accept that explanation. He was sitting up, facing
inland where the thread of valley met the cliff wall. And seeing his
absorption, Dalgard asked no distracting questions.

"No, no snake-devil--" after long moments came the answer. He got to
his feet, shuffling through the sand in the curious little half dance
which betrayed his agitation more strongly than his thoughts had done.

"The hoppers have no news," Dalgard said.

Sssuri gestured impatiently with one outflung hand. "Do the hoppers
wander far from their own nest mounds? Somewhere there--" he pointed
to the left and north, "there is trouble, bad trouble. Tonight we
shall speak with the runners and discover what it may be."

Dalgard glanced about the camp with regret. But he made no protest as
he reached for his bow and stripped off its protective casing. With
the quiver of heavy-duty arrows slung across his shoulder he was ready
to go, following Sssuri inland.

The easy valley path ended less than a quarter of a mile from the sea,
and they were fronted by a wall of rock with no other option than to
climb. But the westering sun made plain every possible hand and foot
hold on its surface.

When they stood at last on the heights and looked ahead, it was across
a broken stretch of bare rock with the green of vegetation beckoning
from at least a mile beyond. Sssuri hesitated for only a moment or
two, his round, almost featureless head turning slowly, until he
fixed on a northeasterly course--striking out unerringly as if he
could already sight the goal. Dalgard fell in behind, looking over the
country with a wary eye. This was just the type of land to harbor
flying dragons. And while those pests were small, their
lightning-swift attack from above made them foes not to be
disreg