28 ARCANA ENTOMOLOGICA. 
attention to the insects which attack trees. It would occupy far 
too great a space to give even the names of the German works upon 
~ obnoxious insects, but the work of Ratzeburg, of which two quarto 
volumes devoted to the Coleoptera and Lepidoptera have appeared, 
illustrated with numerous exquisite plates representing the insects 
in all their states and the modes of their attack upon vegetable 
productions, is too important a work to be passed over in silence. 
Bouche’s “‘ Naturgeschichte der Schadlichen und Nutzlichen Garten- 
insekten,” and the elaborate report of Kollar, made to the Royal 
and Imperial Agricultural Society of Vienna, on the insects injuri- 
ous to gardeners, foresters, and farmers (whereof a translation by 
the Misses Loudon was lately published by the publisher of this 
work) ought not also to be forgotten. 
In France, M. F. Audouin has especially devoted his attention to 
the natural history of obnoxious insects, and in the series of lectures 
which he annually delivers at the Jardin des Plantes, he especially 
illustrates their natural history, although the greater portion of his 
researches are as yet unpublished. Of course as the vine is an impor- 
tant object of culture in France, the inseets which attack that plant 
have been especially studied, and the first part of a very elaborate 
work by M. Audouin, with numerous plates, giving a complete illus- 
tration of one of the species of Tortricide, which is especially 
destructive, has recently appeared under the auspices of govern- 
ment. The Baron Walckenaer has also published a treatise on the 
insects which attack the vine, in the Annales of the French Entomo- 
logical Society. In the south of France and Italy, where the olive 
is greatly cultivated, numerous memoirs have from time to time 
been published on the insects which attack that tree, the greater 
number of which have been enumerated by Costa in the first part 
of his “‘ Corrispondenza Zoologica,” published at Naples, in 1839. 
In England but few works of merit have appeared illustrating 
the habits of obnoxious insects. In 1829,“ A Treatise on the Insects 
most prevalent on Fruit-trees and Garden produce,” was published 
by Joshua Major, a landscape gardener, whose knowledge of insects 
appears to have been very slight ; and, in 1840, a work appeared 
under the title of “ Blight on Flowers, or figures and descriptions 
of the insects infesting the flower-garden,” by Samuel’ Hereman, 
(London, Cradock) in 8vo, with numerous gaudily coloured plates, 
in which are representations of many species of insects which seem 
to me to have no other existence than in the fancy of the delineator. 
Of a very different character are the treatises published by the 
late Mr. Knight in the transactions of the Horticultural Society 
