They made another journey to the north of Cuyaba, to explore the diamond mines, and examine the sources of the Paraguay and Arenos. In the next journey,[20] the particulars of which have just been communicated from Lima, the expedition descended the rivers Cuyaba and San Lorenzo to Paraguay. During this voyage they entered the country of the Guatos Indians, one of the most interesting tribes of the American aborigines. "The features of these Indians," says the Count, "are extremely interesting;--never in my life having seen finer, or any more widely differing from the ordinary type of the red man. Their large, well opened eyes, with long lashes, nose aquiline and admirably modelled, and a long, black beard, would make them one of the finest races in the world, had not their habit of stooping in the canoe bowed the legs of the greater number. Their arms, consisting of very large bows, with arrows seven feet long, demand great bodily strength--and their address in the use of them passes imagination. These savages are timid, nevertheless, and of extreme mildness. By taking them for our guides, and attaching them by small presents, we were enabled to explore parts wholly unknown, of that vast net-work of rivers which they are constantly traversing." In Paraguay the party met a tribe of the celebrated Guaycurus nation. These people are eminently equestrian--transporting their baggage, women and effects of every kind on horseback, across the most arid deserts. They are mortal foes to the Spaniards, and a terror to the whole frontier. They wear their hair long, and paint themselves, black or red, after a very grotesque and irregular fashion; the two sides of their bodies are generally painted in a different manner. "Their chief arms are the lance, knife, and a club, which they throw with great precision at a full gallop. Their hats are made of hides. Each warrior has his mark, which he burns with a red hot iron on all that belongs to him--his horses, dogs and even wives. One of the most atrocious traits in the manners of this people, is that of putting to death all children born of mothers under thirty years of age."