EXTERNAL ANATOMY OF INSECTS. . 553 
part that has usually been regarded as entitled to that 
denomination; for this opinion I shall soon assign my 
reasons. 
8. Scutellum*. Some writers on the anatomy of in- 
sects, looking, it should seem, only at the Coleoptera and 
Orthoptera, have regarded the dorsolum and scutellum as 
forming only one piece, and others have affirmed that 
the Lepzdoptera and subsequent Orders have no scutel- 
lum°. But as we proceed in considering the scutellum 
in all the Orders, we shall see that both these opinions 
are founded on partial views of the subject, and that all 
winged insects have a scwtellum, more or less distinctly 
marked out or separated from the dorsolum. In the Co- 
leoptera the scutellum is usually the viszble, mostly trian- 
gular, piece that intervenes between the elytra at their 
base‘, and which terminates the dorsolum. Some Lamel- 
licorn beetles, &c. (Scarabaeidae) are stated not to have 
the part in question (eascutellati): but this is not strictly 
correct, for in these cases the scutellum exists as the point 
of the dorsolum covered by the prothorax, though it does 
not intervene between the elytra: in others of this tribe, 
as Macrenata chinensis, Marmarina bajula®, &c., it sepa- 
rates these organs at their base, though it is covered by 
the posterior lobe of the prothorax : in Meloe, the elytra 
of which are immoveable, there seems really to be no 
scutellum. Generally speaking, as was lately observed, 
2)Prares VIIL, TX. XXVIIL, 2. > Audoin, Chabrier, &c. 
° Olivier. He seems also to have thought that neither the Or- 
thoptera nor Homopterous Hemiptera have this part. NN. Dice. 
d’ Hist. Nat. x. 112. 
* Prats VIII. Fic. 3. #’. 
° M. bajula, Lanius, &e. are usually arranged under Illiger’s genus 
Afacronaie, but they form a distinct group. 
