Colonel Morello, for Nat had guessed correctly when he concluded that the man was the famous leader, was a man of about fifty years, with a weather-beaten face, seamed and lined by years of exposure and hard living. But his eye, as has been said, was as keen and restless as an eagle's. A big scar made a livid mark across his cheek indicating the course of a bullet, fired years before when Morello had been at the head of a band of Mexican revolutionists. In that capacity, indeed, he had earned his brevet rank of "colonel."

A broad-brim gray sombrero, with a silver embossed band of leather about it, crowned the outlaw chief's head of glossy black hair, worn rather long and streaked with gray. Across his saddle horn rested a long-barrelled automatic rifle, of latest make and pattern. For the rest his clothes were those of an everyday mountaineer with the exception of a wide red sash. His horse was a fine buckskin animal, and was almost as famous in Sierran legend as its redoubtable master.

His companion was a squat, evil-visaged Mexican, with none of the latent nobility visible under the cruelty and rapaciousness which marred what might have once been the prepossessing countenance of Morello. His black hair hung in dank, streaky locks down to the greasy shoulders of his well-worn buckskin coat, and framed a wrinkled face as dark as a bit of smoked mahogany, in which glittered, like two live coals, a pair of shifty black eyes. He was evidently an inferior to the other in every way—except possibly in viciousness.

Such were the two men who had paused below the tree in which was concealed, none too securely, the leader of the young Motor Rangers. As to what his fate might be if he fell into their hands Nat could hazard a guess.

All at once the lad noticed that the branch of the tree upon which he was lying was in motion. His first thought was that one of the men might be shaking it in some way. But no—neither of them had moved. They were seemingly following the remark of the colonel regarding the blue-jays, and taking a last look about before leaving. In another moment Nat would have been safe, but as he moved his eyes to try and see what had shaken the bough he suddenly became aware of an alarming thing.

From the branch of another tree which intertwined with the one in which he was hidden, there was creeping toward him a large animal. The boy gave a horrified gasp as he saw its greenish eyes fixed steadily on him with a purposeful glare.

Step by step, and not making as much noise as a stalking cat, the creature drew closer. To Nat's terrified imagination it almost seemed as if it had already given a death spring, and that he was in its clutches.

Truly his predicament was a terrible one. If he remained as he was the brute was almost certain to spring upon him. On the other hand to make a move to escape would be to draw the attention of the outlaws to his hiding place.

"Phew," thought Nat, "talk about being between two fires!"

Instinctively he drew his revolver. He felt that at least he stood more of a chance with his human foes than he did with this tawny-coated monster of the Sierran slopes.