the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > head > mouth-parts or trophi > space between nasus and lip
rhinarium1823
nostril-piece1826
1826 W. Kirby & W. SpenceIntrod. Entomol. III. xxxiv. 481 A part of the nose [sc. of an insect]..which I have..named the Rhinarium or nostril-piece.