tic creature could only be an anaconda, greatest of all boa constrictors.

To be caught within those crushing coils would mean sure death!

CHAPTER VIII.

A Traitor Strikes "DO not move-not one inch!"

Kamuka repeated that warning as the snake's long body slid slowly past. Whether or not the creature was in search of other prey, to move would be to attract it. Biff realized that from Kamuka's tone as well as his words.

Gradually, the sliding coils slackened speed. It was Biff who spoke now, his own voice strained, but low: "It's turning now, Kamuka. It may be coming back."

"Maybe, but stay still. One move, you are gone."

Despite himself, Biff raised his head, only slightly, but enough to look beyond the long, hoselike body that was still gliding by. Aloud, Biff groaned: "There is Luiz-coming straight toward us-"

Biff threw up his arms to ward off the great boa's tail as it lashed past. Looking up, he saw the snake's huge mouth yawning toward him. Biff shut his eyes, 68 .

thinking there was no hope now. Then a wild scream came from just ahead.

Biff and Kamuka bobbed up from the gra.s.s and saw what had happened. The anaconda, on the rove for prey, had lashed out for the first moving thing that approached it-Luiz. Caught in the snake's coils, the guide was shouting: "Urubu! Ajudo! Ajudo!"

Urubu took one quick look and relayed the call for help. Serbot and Pepito came from the tent, saw what was happening, and dashed back for their guns. Biff didn't wait to watch what followed. He grabbed Kamuka's arm and exclaimed, "Let's go!"

They went. Behind them, they heard a burst of gunfire. Those first shots must have wounded the anaconda or frightened it away, for the next volley whistled through the foliage as Biff and Kamuka dived into the jungle. The boys found their path and raced along it until the shooting dwindled far behind them.

Breathless, they slackened their pace to a walk and talked over what had happened. In a worried tone, Biff said: "They must have seen us or they wouldn't have fired after us. I hope they didn't know who we were."

"More likely," observed Kamuka seriously, "I think they don't know what we were."

"You mean they mistook us for some jungle animals?"

A TRAITOR STRIKES 69.

"Why not? We were gone quick-pouf! Maybe we were gone quicker than sucuria."

By "sucuria" Kamuka meant the anaconda. He was referring to the giant water boa by its more popular Brazilian name. Kamuka's comment brought a smile from Biff.

"I wonder if they shot the anaconda," he speculated, "or whether it managed to get away."

"Perhaps Luiz will tell us," rejoined Kamuka, grinning, "when he gets back to our camp."

"If Luiz ever gets back there at all!"

The boys lost no time in getting back to camp themselves. There, they told Mr. Brewster and Mr. Whitman all that had happened.

"Serbot must have learned a lot from somebody down in Minas Geraes," decided Mr. Brewster, "though how, I can't quite understand. I checked everyone who had talked with Lew Kirby, and I felt sure he had confided in me alone."

"And how did Serbot hear about Joe Nara?" queried Mr. Whitman. "There have been rumors of head-hunters and abandoned rubber plantations off in the jungle. But no talk of prospectors and gold mines- at least none that reached me."

"There were rumors farther up the river," Biff's father said, "according to what Nara told us. When Joe bought that cruiser and came down to Manaus, he turned rumor into fact."

"Nara found out about us," Hal Whitman pointed 70 .

out, "so why shouldn't Serbot find out about Nara? Or about us, for that matter? We know1 now where the leak came. Through Urubu."

Mr. Brewster weighed that statement, then slowly shook his head.

"Urubu couldn't have sent word to Serbot that fast," he declared, then, turning to Biff, he queried: "You are sure Serbot told Luiz to find out what he could about Nara?"

"Yes," replied Biff, "and about the map, too."

"Then it wasn't Serbot's man who stole the map," mused Mr. Brewster, "unless he wants that missing corner that I still have. Or else-"

Mr. Brewster interrupted himself, as sounds of excitement came from the bearers, who were busy thatching palm leaves to form a shelter. Their babble of dialect included the name "Luiz," and a couple of the bearers were running to help the guide as he came limping into camp.

"Say nothing," warned Mr. Brewster. "Just listen to what Luiz has to tell us."

Luiz had plenty to tell when they formed a sympathetic group around him.

"I look for water hole," Luiz told them, "and I meet una grande sucuria-one big anaconda! He grab me around my body, like this!"

Graphically, Luiz gestured to indicate how the snake's coils had encircled his body.

Biff and Kamuka kept straight, solemn faces as Luiz continued.

A TRAITOR STRIKES 71.

"I pull my gun quick!" Luiz thrust his hand deep in his trouser pocket and brought out a small revolver. "I fire quick, until the gun is empty." He clicked the trigger repeatedly; then broke open the revolver and showed its empty chambers. "Still, anaconda hold me, until I draw knife and stab him hard!"

From a sheath at the back of his belt, Luiz whipped out a knife that looked far more formidable than his puny gun. He gave fierce stabs at the imaginary anaconda, his face gleaming with an ugly smile that was more vicious than triumphant. Luiz looked like a small edition of Urubu, whose ways he seemed to copy.

"Big snake go off into jungle," added Luiz, wiggling his hand ahead of him to indicate the anaconda's writhing course. "Hurt bad, I think. Maybe it is dead by now. But the animals were still afraid of it. I hear them run."

His sharp eyes darted from Biff to Kamuka, but neither boy changed expression. Clumsily, Luiz pocketed the revolver with his left hand and thrust the knife smoothly back into its sheath with his right. He rubbed his side painfully, then beckoned to two of the natives and said, "We go look for water hole again."

A short while later, the boys had a chance to exchange comments while they were gathering palm fronds for the shelter. After making sure that no one else was nearby, Kamuka confided: "Luiz had no gun at start of safari. Urubu must have given gun to him."

72.

"To explain the shots if any of our party heard them!" exclaimed Biff. "And did you see the way Luiz looked at us when he mentioned scared animals? Maybe they glimpsed us going into the brush."

"Maybe," agreed Kamuka. "I think they shoot anaconda, or big sucuria would not let Luiz go so easy."

"That's another reason why Luiz claimed he shot it," added Biff. "We might come across the anaconda and find the bullet marks."

Shortly afterward, the boys found a chance to repeat those opinions to Mr. Brewster, who added a few points that they had overlooked.

"Luiz couldn't possibly have brought the gun from his pocket, as he claimed," stated Mr. Brewster, "because the snake was already coiled about his body. For that matter, he could not have drawn his knife, either.

"However, from the clumsy way he showed us the gun and put it back in the wrong pocket, you could tell he had never handled it before. In contrast, he was smooth and quick with his knife, which is obviously his customary weapon."

One question still perplexed Biff.

"That other camp is a good way off, Dad," Biff said, "yet we heard the anvil strokes before we started out. How come you didn't hear the gunfire later?"

"Urubu may have made the first strokes closer by," replied Mr. Brewster. "The anvil sound is also sharper than a gunshot and should carry farther. That is prob- A TRAITOR STRIKES 73.

ably why they chose it as a signal. Kamuka did well to detect it."

That evening, Biff was glad there had been time to build the thatched shelter, for a tropical dew had begun to settle, almost as thick as a dripping rain. It was less damp beneath the shelter, where Biff and Kamuka had slung their hammocks.

Mr. Brewster, however, had inflated a rubber mattress and had placed it near trie fire, stating that he would use a poncho to keep off the moisture. From his hammock, Biff watched his dad arrange small logs and palm stalks as spare fuel. As he closed his eyes, Biff could hear his father talking to Luiz, who was standing close by.

"I will watch the fire tonight," announced Mr. Brewster. "You have been hurt. You need rest more than I do."

"But, Senhor," objected Luiz. "Suppose you fall asleep-"

"I am sure to wake up at intervals. I always do. But you must get some sleep, Luiz. We need you to guide us to Piedra Del Cucuy. You are sure you know the way?"

"Most certainly, Senhor. But it may take longer than you expect."

A pause-then Mr. Brewster asked bluntly, "Why?"

"Because the shortest way is not the best way," returned Luiz. "We might meet floods, or streams 74 .

where the piranha may attack us. They are very dangerous fish, the piranha-"

"I know," interrupted Mr. Brewster impatiently, "but we have no time to waste."

"You are meeting someone at Piedra Del Cucuy?"

"Yes," replied Mr. Brewster. "A man named-" He caught himself, then said in a blunt tone: "I won't know our plans until we get there. We will continue on up the river. That is all that I can tell you."

"Don't you have a map, Senhor?"

Biff opened his eyes at Luiz's question. He saw his father start to reach into his inside pocket, then bring his hand out empty. Shaking his head, Mr. Brewster said: "No, I have no map. Go get some sleep, Luiz. You will need it."

Biff glimpsed Luiz's face as the sneaky guide turned from the firelight. Beneath the hatbrim, Luiz wore that same ugly smile that showed his satisfaction. Obviously, Luiz was planning his next move, probably for tomorrow.

When it came, his father would be ready for it, Biff felt sure. Soon Biff drifted into a fitful sleep from which he awoke at intervals. Sometimes he heard the crackle of the fire and decided that his father must have thrown on a log and then gone back to sleep. For, each time, Biff saw the figure of Mr. Brewster covered by the rubber poncho, near the pile of logs that had become much smaller during the night. It A TRAITOR STRIKES 75.

must have been the fourth or fifth awakening, when Biff saw someone move into the firelight's flicker.

It was Luiz. He crept forward. Crouched above the quiet form, Luiz thrust his hand downward as if to reach into the sleeper's pocket.

The figure under the poncho seemed to stir. Luiz recoiled quickly and sped his hand to his hip. Before Biff could shout a warning, Luiz had whipped out his long knife into sight and driven it straight down at the helpless shape beneath him.

CHAPTER IX.

The Shrunken Heads WILDLY, Biff tumbled from his hammock to the soggy ground. Coming to his hands and knees, he started forward just as another figure sprang into the firelight, too late to halt Luiz's knife. The newcomer grabbed Luiz's shoulders and spun the little man full about. For a moment, Luiz poised his blade as though planning to counter the attack.

Instead, he uttered an unearthly shriek, as though he had seen a ghost. Biff was startled, too, but his cry was a glad one. Etched against the firelight, Biff saw his dad's face looking down at Luiz.

Tom Brewster himself was the man who had interrupted Luiz's deadly work. The figure under the poncho, Biff realized, must be a dummy.

As the two men struggled for possession of the knife, they kicked the dummy apart with their feet. Suddenly Luiz managed to wrench free and dashed off into the jungle.

THE SHRUNKEN HEADS 77.

Mr. Brewster didn't bother to start after the terrified guide. But Hal Whitman came rushing from the shelter waving a revolver. Mr. Whitman fired a few wild shots in the direction that Luiz had taken. The crackling of jungle plants came back like echoes, indicating that the gunfire had spurred Luiz's mad flight.

"That's enough, Hal," laughed Mr. Brewster. "The fellow is so badly scared he won't stop running until he reaches Serbot's camp."

"And the more he runs," returned Mr. Whitman, "the more difficulty he will have finding it in the dark. Well, if Luiz gets lost in the jungle, he won't talk to Serbot."

"I don't think it matters much, Hal. Luiz has already told Serbot all he knows."

"Except that we found out his game. Now he will tell that to Serbot, too-if he finds him."

By the flickering firelight, Biff saw his father's face take on a troubled expression.

"You're right, Hal," decided Mr. Brewster grimly. "I hadn't thought of that. It would be better to catch Luiz and take him along with us. It's probably too late now, but it may be worth a try." Mr. Brewster turned to Jacome. "Call Luiz, and see if he answers."

Jacome gave a long call: "Luiz! Luiz!" Faintly, like a faraway echo, a voice responded: "Ajudo! Ajudo!"

In the firelight, Biff and Kamuka exchanged startled glances. Both had the same sudden thought, 78 .

but it was Biff who exclaimed, "The quicksand! Luiz must have taken the same path that we did this afternoon!"