The reptiles are numerous; the cayman, or alligator, being nearly as formidable in appearance as the Egyptian crocodile. The serpents in the forests and marshes attain an enormous size, but are rarely found in the inhabited districts. The lizard tribe, from the cayman down to the water lizard, are very numerous. The rattle snake, cenocoatl, or phosphorescent snake, are the most venomous; and there are many harmless snakes, who devour the ants and other insects. Edible frogs, of three species, which attain a great size, are found in Lake Chalco and are eaten at Mexico. The rivers and lakes abound with fish, as do the seas which bound the province. Turtles are a principal article of food; lobsters, and other crustaceous animals also abound; and upwards of one hundred kinds of nutritious fish, have been enumerated as used by the inhabitants. Sharks of great voracity are found on the coasts; and the almost tepid water of the Mexican gulf, seems highly natural for the production of the large aquatic animals. Beautiful shells are collected on the shores, and sponges and lithophytes are produced in great variety. The insect tribe, terrestrial, aquatic, and atmospherical, are more numerous than can be conceived; of these, the scolopendras, ants, scorpions, spiders of great size, are all dreadful and venomous; hornets, wasps, bees, &c. common, and the fire-fly and lanthorn beetle, are singular and innumerable; indeed, the whole continent of America seems to be amply furnished with luminous insects, which are not to be found in Europe. A large fly, which is produced near the Mexican lake, lays innumerable eggs on the flags which border the shores; these eggs are collected by the natives, and made into a sort of paste for sale in the market, where it is eagerly purchased for food, and is said to resemble caviare. Mosquitoes and venomous gnats occupy the air in clouds, and are extremely tormenting, sometimes causing inflammatory appearances on the bitten parts, which become dangerous. The capital, though on a lake, is however free from these pests, probably owing to the circumambient atmosphere being charged with smoke; the smoke or vapour of wood fires being destructive to these insects. Thus many towns in North America are free from mosquitoes, whilst, if you step across their boundaries, these insects immediately assail you, and it is remarkable, that they are more troublesome to strangers than to the natives. Butterflies of every beautiful and elegant variety are natives of the Mexican forests and fields, and form rich articles in the collections of the virtuosi. A species of locust sometimes destroys the rising vegetables, and great distress is felt from their ravages. A species of the tique or tick is as troublesome as the chigoe, or jigger of the West Indies. Many of the insect tribe, after being reduced to powder, and made into paste, are eaten by the natives, as they were also before the conquest.