i176 Mr. W.S. MacLeay on the Anatomy of the 
to the stigmata of the scutellum of the metathorax.* Perhaps these are 
Mr. Kirby’s parapleure. 
4, The epimera are large, connecting the scutellum with the meta- 
sternum, and passing from the episternum to the postscutellum.t Mr. 
Kirby seems only to have noticed these pieces under the peculiar form 
they adopt iu Tettigonia, where he calls them opercula.t 
Applying the above philosophical nomenclature to certain insects, which 
have hitherto been considered anomalous, we shall get some remarkable 
results. Let us take, for instance, Stylops Melitte.§ We find the puz~ 
zling appendages to the scutum of the mesothorax to be true elytra, and 
that consequently the only wings the insect possesses are the under wings, 
the paraptera of which are enormously developed as well as the epimera 
of the metathorax. This insect, in fact, ceases to be so very extraor- 
dinary.|| 
Having now detailed this symmetrical theory of the thorax, I may 
apprize the reader that my future descriptions shall be adapted to it. M. 
Jurine, in his valuable paper on the wings of Hymenoptera, says their 
thorax is composed of thirty-six pieces. Considering, however, the 
clavicle of M, Chabrier and the squamula to belong to the wing, there 
are only the follcwing pieces according to Audouin, viz. 
© Fig. 5and 10, N. + Fig. 5 and 10, M. 
t See “‘ Rapport fait a l’Acad. des Sciences, &c., 19 Février, 1821.” p. 7. 
§ Having no specimen of the Stylops with me, I am here alluding to Mr. 
Bauer’s figure of it in the Linnean Transactions, and allowance ought accord- 
ingly to be made for my not here speaking from actual dissection. From M. 
Jurine’s beautiful dissections of Xenos Vesparum it appears that the Strepsiptera 
differ from each other considerably in structure, 
|| In the same way Evania ceases to have its abdomen very singularly situ- 
ated on this explanation of its anatomy, The scutellum and postscutellum of 
the metathorax in this genus being confluent, and the postscutellum, never- 
theless, excessively developed, the abdomen appears inserted on the back of 
the insect. Itis, however, in its proper place. 
