474 EXTERNAL ANATOMY OF INSECTS. 
Having given you this particular account of the ¢rophi 
or organs of the mouth of insects, I must now make some 
observations upon the other parts of the head. I have 
divided it, as you see in the Table, into face and subface ; 
the former including its upper and the latter its Jower 
surface. Strictly speaking, some parts of the face, as the 
temples and cheeks, are common to both surfaces; but 
I do not therefore reckon them as belonging to the sub- 
face, which, exclusive of the mouth and its organs, con- 
sists only of the ¢hroat, and where there is a neck, the 
gula. . 
i. Nasus*.—lI shall consider the parts of the face in the 
order in which they stand in the Table, beginning with 
the masus or nose. Fabricius has denominated this part 
the clypeus, in which he has been followed by most mo- 
dern Entomologists. You may therefore think, perhaps, 
that I have here unnecessarily altered a term so gene- 
rally adopted, and expect that I assign some sufficient 
reasons for such a change. I have before hinted that 
there is good ground for thinking that the sense of smedl 
in insects resides somewhere in the vicinity of this part; 
and when I come to treat of their senses, I shall produce 
at large those arguments that have induced me to adopt 
this opinion: and if I can make out this satisfactorily, 
you will readily allow the propriety of the denomination. 
I shall here only state those secondary reasons for the 
term, which, in my idea, prove that it is much more to 
the purpose than clypeus. ‘This last word was originally 
applied by Linné in a metaphorical sense to the ample 
covering of the head of the Scarabaida, and the thoracic 
2 Pirates VI. VIL. XXVIII. a. 
