millions of individuals, comprising many different species and genera. The beautiful tailed green and gilded dayflying moth (Urania leilus) also joins in this annual movement. When in Brazil, I observed similar flights of butterflies at Pernambuco and Maranham, all travelling south-east. Mr. R. Spruce describes a migration which he witnessed on the Amazon, in November 1849, of the common white and yellow butterflies. They were all passing to the south-south-east.* Darwin mentions

that several times when off the shores of Northern Patagonia, and at other times when some miles off the mouth of the Plata, the ship was surrounded by butterflies; so numerous were they on one occasion, that it was not possible to see a space free from them, and the seamen cried out that it was "snowing butterflies." ↑ These butterflies must also come from the westward. I know of no satisfactory explanation of these immense migrations. They occurred every year whilst I was in Chontales, and always in the same direction. I thought that some of the earlier flights in April might be caused by the vegetation of the Pacific side of the continent being still parched up, whilst on the Atlantic slope the forests were green and moist. But in June there had been abundant rains on the Pacific side, and vegetation was everywhere growing luxuriantly. Neither would their direction from the north-west bring them from the Pacific, but from the interior of Honduras and Guatemala. The difficulty is that there are no return swarms. If they travelled in 'one direction at one season of the year, and in an opposite at another, we might suppose "Journal of the Linnæan Society," vol. ix. "Naturalist's Voyage," p. 158.

that the vegetation on which the caterpillars feed was at one time more abundant in the north-west, at another in the south-east; but during the five years I was in Central America, I was always on the look-out for them, and never saw any return swarms of butterflies. Their migration every year in one definite direction is quite unintelligible to me.

We gradually ascended the range that separates the water-shed of the Lake of Nicaragua from that of the Blewfields river, passing over grassy savannahs. About two leagues from Libertad there are many old Indian graves, covered with mounds of earth and stones. A. well-educated Englishman, Mr. Fairbairn, has taken up his abode at this place, and is growing maize and rearing cattle. There are many evidences of a large Indian population having lived at this spot, and their pottery and fragments of their stones for bruising maize have been found in some graves that have been opened. Mr. Fairbairn got me several of these curiosities, amongst them are imitations of the heads of armadillos, and other animals. Some of these had formed the feet of urns, others were rattles, containing small balls of baked clay. The old Indians used these rattles in their solemn religious dances, and the custom is probably not yet quite obsolete, for as late as 1823 Mr. W. Bullock saw, in Mexico, Indian women dancing in a masque representing the court of Montezuma, and holding rattles in their right hands, to the noise of which they accompanied their motions. Several stone axes have been found, which are called "thunderbolts" by the natives, who have no idea that they are artificial, although it is less than four hundred years ago since their forefathers used them. Like

most of the sites of the ancient Indian towns, the place is a very picturesque one. At a short distance to the west, rise the precipitous rocks of the Amerrique range, with great perpendicular cliffs, and huge isolated rocks and pinnacles. The name of this range gives us a clue to the race of the ancient inhabitants. In the highlands of Honduras, as has been noted by Squiers, the termination of tique or rique is of frequent occurrence in the names of places, as Chaparristique, Lepaterique, Llotique, Ajuterique, and others. The race that inhabited this region were the Lenca Indians, often mentioned in the accounts given by the missionaries of their early expeditions into Honduras. I think that the Lenca Indians were the ancient inhabitants of Chontales, that they were the "Chontals" of the Nahuatls or Aztecs of the Pacific side of the country, and that they were partly conquered, and their territories encroached upon by the latter before the arrival of the Spaniards, as some of the Aztec names of places in Nicaragua do not appear to be such as could be given originally by the first inhabitants; thus Juigalpa, pronounced Hueygalpa, is southern Aztec for "Big Town." No town could be called the big town at first by those who saw it grow up gradually from small beginnings, but it is a likely enough name to be given by a conquering invader. Again Ometépec is nearly pure Aztec for Two Peaks, but the island itself only contains one, and the name was probably given by an invader who saw the two peaks of Ometepec and Madera from the shore of the lake, and thought they belonged to one island. The Lenca Indians nowhere appear to have built stone buildings, like the Quiches, and Lacandones of Guatemala, and the Mayas of Yucatan,

who were probably much more nearly affiliated to the Nahuatls of Mexico than the Lencas.

We reached the top of the dividing range, and now left the main road, taking a path to the left, that is very rocky and narrow. We began rapidly to descend, and found an entire change of climate on this side of the range. It had been raining for weeks at Libertad, and everywhere the ground was wet and swampy, but two miles on the other side of the range the ground was quite dry, and so it continued to Juigalpa. Dry gravelly hills, covered with low scrubby bushes and trees, succeeded the damp grassy slopes we had been for hours travelling over. Prickly acacias, nancitos, guayavas, jicaras, were the principal trees, with here and there the one whose thick coriaceous leaves are used by the natives instead of sandpaper. The beds of the rivers were dry, or at the most contained only stagnant pools of water, until we reached the Juigalpa river, which rises far to the eastward; the north-east trade wind in crossing the great forest that clothes the Atlantic slope of the continent, gives up most of its moisture; and this range, rising about three thousand feet above the sea, intercepts nearly all that remains, so that only occasional showers reach Juigalpa.

On one of the low gravelly hills that we passed, not far from the path, we saw a troop of the white-faced monkey (Cebus albifrons) on the ground, amongst low scattered trees. Their attitudes, some standing up on their hind legs to get a better look at us, others with their backs arched like cats, were amusing. Though quite ready to run away, they stood all quite still, watching us, and looked as if they had been grouped for

a photograph. A few steps towards them sent them scampering off, barking as they went.

Soon after this, I got severely stung by a number of small wasps, whose nest I had disturbed in passing under some bushes. About thirty were upon me, but I got off with about half-a-dozen stings, as I managed to kill the rest as they made their way through the hair of my head and beard, for these wasps, having generally to do with animals covered with hair, do not fly at the open face, but at the hair of the head, and push down through it to the skin before they sting. On this and on another occasion on which I was attacked by them, I had not a single sting on the exposed portions of my face, although my hands were stung in killing them in my hair. It is curious to note that the large black wasp that makes its nest under the verandahs of houses and eaves of huts, and has had to deal with man as his principal foe, flies directly at the face when molested.

Without further adventure we reached Juigalpa at dusk, and took up our quarters not far from the plaza, in a house where one large room was set apart for the accommodation of travellers. We found we should have to stay for a couple of days before our business was concluded; and whilst waiting for some law papers to. be made out, I determined to try to see some of the Indian antiquities in the neighbourhood. We had hard leather stretchers to sleep on, the use of mattresses being almost unknown.

Next morning I was up at daylight, and, after getting a cup of coffee and milk, started off on horseback on the lower road towards Acoyapo. This led over undulating savannahs, with grass and jicara trees, and