REVIEWS. 
49 
RECENT WORKS ON THE DIPTERA OF NORTHERN EUROPE. 
1. Zetterstedt, Insecta Lapponica, etc. 1 Tom. Folio; Lipsiae, 1840. 
2. Zetterstedt, Diptera Scandinavia, etc. 11 Tomi, 8vo. Lundae, 
1842-1852. 
3. Stager, Systematise Fortegnelse over de i Danmark fundne Dip¬ 
tera, samt Danske Dolichopoder, o.s.v. i Kroyers Naturhistorisk 
Tidsskrift, lste Raekke, lste-4de Bind, 1837-1844. 
4. Stenhammar, Forsok till Gruppering och Revision af de Svenska 
Ephydrina, i Kongl. Sv. Yet. Akademiens Handlingar for aar 1843. 
5. Wahlberg, 
Nya Svenska Diptera, i detsamma, och Oefversigt af K. 
Sv. Vet. Akad. Forhandlingar,—aatskilliga aar. 
Dahlbom, 
Bohemann, 
The extent of the field which Entomology appropriates, even since the 
Crustacea and Arachnida have been detached from it, has made its literature 
already voluminous, though barely of the growth of a century, and promises 
an increase in proportion for a long time to come. Apart from the com¬ 
mon domains of anatomy and physiology, the history and classification of 
its countless species, probably outnumbering all the other denizens of the 
land, are enough to occupy Reaumurs and Degeers, if such there should be, 
yet unborn. Probably, in consequence, a somewhat partial and one-sided 
character has been impressed upon the science with most who have pur¬ 
sued it with predilection; so that the results to be looked for from the study 
of the endlessly-diversified, yet closely-linked, modifications of that one well- 
marked type of organization, have scarcely yet redounded to the benefit of 
biological science in general. And not only has Entomology been treated 
as if it were an independent branch, but the attention both of collectors 
and systematists has been much confined to one or two orders out of the 
whole. Indeed, reasons may be easily found for the preference so generally 
given to the Lepidoptera and Coleoptera; and the classification of the latter 
has now arrived at such a stage, that the study of it may be considered as 
a preliminary training for that of the other orders. But, this point attained, 
we are glad to see increasing attention of late directed towards the some¬ 
time slighted clearwings of collectors, as preparing the way for broader 
views of the class- of insects, in itself as a whole, and in its relations to 
the rest of animated nature. Each of the other orders, meantime, may 
VOL. II. E 
