EXTERNAL ANATOMY OF INSECTS. 481 
per-lip than the nostril-piece, forming as it were a triple 
gradation from the front to the mouth. Again, in others 
the part in question is received into a sinus of the nose. 
This is the case with the dragon-flies (Zibellulina), in 
which this sinus is very wide; in the burying-beetle 
(Necrophorus)*, in some species of which it is deep but 
narrow ; and in a species of Tenebrio from New Holland, 
which perhaps would make a subgenus. If you examine 
with a common glass any of the larger rove-beetles (Sta- 
phylinide), you will find that the nose itself seems lost 
in the nostril-piece, both together forming a very narrow 
line across the head above the labrum, without any ap- 
parent distinction between them; but if you have recourse 
to a higher magnifier, you will find this divided into an 
upper and lower part, the former of the hard substance 
of the rest of the head, and the latter membranous. I 
once was of opinion that the prominent transversely fur- 
rowed part, so conspicuous in the face of Cicada’, was 
the front: but upon considering the situation of this, 
chiefly below the eyes and antennz, and comparing it 
with the analogous piece in Fulgora laternaria and other 
insects of the Homopterous section of the Hemiptera, I 
incline to think that it represents the nose, and that the 
longitudinal ridge below it is the nostril-piece°. In the 
Heteropterous section it is merely the vertical termina- 
tion of their narrow nose. In other insects again, this 
part approaches in some measure to the common idea of 
nostrils; there being fwo, either one on each side the 
nose, or two approximated ones. If you catch the first 
humble-bee that you see busy upon a flower, you will 
* Prate VI. Fic. 10, g’. > Ibid. Fre. 7. a. * Ibid. ¢’. 
VOL, III, 21 
