and followed the movements of the insect with his keen ears, and then he felt it alight upon his forehead. No muscle twitched, for the muscles of such as he are the servants of the brain. Down across his face crept the horrid thing—over nose and lips and chin. Upon his throat it paused, and turning, retraced its steps. Tarzan watched Rabba Kega. Now not even his eyes moved. So motionless he crouched that only death might counterpart his movelessness. The insect crawled upward over the nut-brown cheek and stopped with its antennae brushing the lashes of his lower lid. You or I would have started back, closing our eyes and striking at the thing; but you and I are the slaves, not the masters of our nerves. Had the thing crawled upon the eyeball of the ape-man, it is believable that he could yet have remained wide-eyed and rigid; but it did not. For a moment it loitered there close to the lower lid, then it rose and buzzed away.
Down toward Rabba Kega it buzzed and the black man heard it, saw it, struck at it, and was stung upon the cheek before he killed it. Then he rose with a howl of pain and anger, and as he turned up the trail toward the village of Mbonga, the chief, his broad, black back was exposed to the silent thing waiting above him.
And as Rabba Kega turned, a lithe figure shot outward and downward from the tree above upon his broad shoulders. The impact of the springing
