I am indebted to Mr. H.W. Bates for much assistance, and especially for undertaking the superintendence of these sheets in their passage through the press; to Mr. W.C. Hewitson, of Oatlands Park, I am under many obligations, for taking charge of my entomological collections, for naming many of my butterflies, and for access to his magnificent collection of Diurnal Lepidoptera. Mr. Osbert Salvin and Dr. P.L. Sclater have named for me my collection of birds; and for much entomological information I am indebted to Professor Westwood, Mr. F. Smith, and Dr. D. Sharp; whilst, in botany, Professor D. Oliver, of Kew, has kindly named for me some of the plants. Through the assistance of these eminent authorities, I trust that the scientific names scattered throughout the book may be depended upon as correct. Nijni Novgorod, October 9th, 1873. THE NATURALIST IN NICARAGUA. CHAPTER 1. Arrival at Greytown. The river San Juan. Silting up of the harbour. Crossing the bar. Lives lost on it. Sharks. Christopher Columbus. Appearance of the town. Trade. Healthiness of the town and its probable cause. Comparison between Greytown, Pernambuco, and Maceio. Wild fruits. Plants. Parrots, toucans, and tanagers. Butterflies and beetles. Mimetic forms. Alligators. Boy drowned at Blewfields by an alligator. Their method of catching wild pigs. At noon on the 15th February 1868, the R.M.S.S. "Solent," in which I was a passenger, anchored off Greytown, or San Juan del Norte, the Atlantic port of Nicaragua in Central America. We lay about a mile from the shore, and saw a low flat coast stretching before us. It was the delta of the river San Juan, into which flows the drainage of a great part of Nicaragua and Costa Rica, and which is the outlet for the waters of the great lake of Nicaragua. Its watershed extends to within a few miles of the Pacific, for here the isthmus of Central America, as in the great continents to the north and south of it, sends off by far the largest portion of its drainage to the Atlantic. In the rainy season the San Juan is a noble river, and even in the dry months, from March to June, there is sufficient water coming down from the lake to keep open a fine harbour, if it were not that about twenty miles above its mouth it begins to dissipate its force by sending off a large branch called the Colorado river, and lower down parts with more of its waters by side channels. Twenty years ago the main body of water ran past Greytown; there was then a magnificent port, and large ships sailed up to the town, but for several years past the Colorado branch has been taking away more and more of its waters, and the port of Greytown has in consequence silted up. All ships now have to lie off outside, and a shallow and, in heavy weather, dangerous bar has to be crossed.* [* Greytown is still the headquarters of Nicaraguan trade with Europe and Eastern America though the attempts to improve the harbour by dredging and building jetties have had only