OF WASHINGTON. 67 
In the second edition, published in 1740, the same four 
orders are recognized, but the name of one of them, Angioptera, 
is here changed to GYMNAPTERA. The Diptera are arranged 
as in the first edition except that only four species are listed, 
namely, Musca, Tabanus, Culex and Oestrum, while after each 
is given its vulgar or common German name. 
The first edition of the Fauna Suecica appeared in the year 
1746. In this work no less than seven orders of insects are 
recognized, the names of four of them appearing for the first 
time, namely, NEUROPTERA, LEPIDOPTERA, HYMENOPTERA, 
and DIPTERA. The names, Angioptera, of the first edition of 
the Sy sterna Nature, and Gymnaptera, of the second edition, 
are dropped entirely in the present work, while the other 
previously proposed names Coleoptera, Hemiptera, and 
Aptera, are retained, but in a restricted sense. In the Diptera 
the number of genera have increased from the one, given in 
the first and second editions of the Sy sterna, to seven, namely ; 
(Estrus, Asilus, Hippobosca, Tabanus, Musca, Culex, and 
Tipula. This work marks a very great advance in the matter 
of classification, especially in regard to genera and species. 
The genera are not described, but the species are characterized 
at considerable length, although not named specifically. 
The next, or sixth, edition of the Sy sterna Nature appeared 
in the year 1748, and is practically a repetition of the preceding 
work, but with the descriptions of the species omitted. The 
genera, however, are briefly described. 
The tenth edition was published in 1 758. Here the binomial 
system of nomenclature is given in its more perfected form, 
each species having a separate name. The orders are as in 
the sixth edition. In the Diptera three new genera are added, 
namely, Empis, Conops, and Bombylius. 
The second and last edition of the Fauna Suecica appeared 
in 1 761 ; the orders in the insects and the genera in the Diptera 
are the same as given in the tenth edition of the Sy sterna 
Natural. 
The twelfth and last authorized edition of the Systema 
Natures was published in two parts; the insects are comprised 
in the second part, which bears the date of 1767. The orders 
and genera of the Diptera are the same as in the tenth edition. 
