THE 
ZOOLOGICAL JOURNAL. 
February—June, 1830. 
Art. XXVI. Explanation of the Comparative Anatomy of 
the Thorax in Winged Insects, with a Review of the present 
state of the Nomenclature of its parts. By W.S, Mac- 
Leay, Esq., 4.M., F.LS., &€. 
My dear Vigors, 
The enclosed in fact belongs to the Third Part of the “‘ Hore Entomo- 
logice,” entitled “An Analytical Essay on the Developement of Annu- 
« lose Forms ;’’ * but as the receipt of some of the late publications from 
England makes me sorry that errors should acquire strength by not being 
* It has been thought that this Essay is to be confined to the description of 
the structure of Larve. My intention, however, is, that it should embrace the 
developement of the whole Annulose Structure, whether in the Larva, Pupa, 
or Imago state. To those friends who have of late urged me to give a second 
edition of the first volume of the “‘ Hore Entomologice,’’ I take the opportunity 
of saying, that this will probably never be done, at least.under the same form ; 
—a form, which, however convenient for the purpose of making known the 
results of my various investigations in the shape of Essays, is not such as I 
would choose, were I to state those investigations a second time to the ento- 
mological world, For instance, the First Part of the “ Hore Entomologice,” 
although it led the way to the researches explained in the Second Part, ought 
hereafter, in fact, to follow them, The form of the work, however, is too 
convenient to be abandoned by a naturalist whose other occupations will only 
permit his making, from time to time, detached Essays; and this must be my 
only apology for intending to continue a work, of which the first volume is in 
so few hands, and of which a second edition will probably never be published, 
Vou. V. K 
