constituting even a distinct variety; for the few species that are resident and breed in the islands are continually crossed by individual immigrants of the same species from the mainland. Four European birds also have occurred in Bermuda;--the wheatear (_Saxicola oenanthe_), which visits Iceland and Lapland and sometimes the northern United States; the skylark (_Alauda arvensis_), but this was probably an imported bird or an escape from some ship; the land-rail (_Crex pratensis_), which also wanders to Greenland and the United States; and the common snipe (_Scolopax gallinago_), which occurs not unfrequently in Greenland but has not yet been noticed in North America. It is however so like the American snipe (_S. wilsoni_), that a straggler might easily be overlooked. Two small bats of N. American species also occasionally reach the island, while two others from the West Indies have more rarely occurred, and these are the only wild mammalia except rats and mice. _Insects of Bermuda._--Insects appear to be very scarce; but it is evident from the lists given by Mr. Jones, and more recently by Professor Heilprin, that only the more conspicuous species have been yet collected. These {270} comprise nineteen beetles, eleven bees and wasps, twenty-six butterflies and moths, nine flies, and the same number of Hemiptera, Orthoptera, and Neuroptera respectively. All appear to be common North American or West Indian species; but until some competent entomological collector visits the islands it is impossible to say whether there are or are not any peculiar species.[57] _Land Mollusca._--The land-shells of the Bermudas are somewhat more interesting, as they appear to be the only group of animals except reptiles in which there are any peculiar species. The following list was kindly furnished me by Mr. Thomas Bland of New York, who has made a special study of the terrestrial molluscs of the West Indian Islands, from which those of the Bermudas have undoubtedly been derived. The nomenclature has been corrected in accordance with the list given in Professor Heilprin's work on the islands. The species which are peculiar to the islands are indicated by italics. LIST OF THE LAND-SHELLS OF BERMUDA. 1. Succinea fulgens. (Lea.) Also in Cuba. 2. ,, Bermudensis. (Pfeiffer.) ,, Barbadoes (?) 3. ,, margarita. (Pfr.) ,, Haiti. 4. _Poecilozonites Bermudensis._ (Pfr.) A peculiar form, which, according to Mr. Binney, "cannot be placed in any recognised genus." A larger sub-fossil variety also occurs, named _H. Nelsoni_, by Mr. Bland, and which appears sufficiently distinct to be classed as another species.