Figure 286 represents the taste-cups on the maxilla of a wasp, and Fig. 287 the taste-cone or peg projecting from the cup or pit. The cell out of which the pit and projecting hair or peg are formed is a modified hypodermis cell; and the seta is apparently a modification of a tactile hair, situated at the end of a nerve, which just beneath the chitinous structures passes into a ganglion-cell, which sends off a nerve-fibre to the main nerve. Will detected on the tongue of the yellow ant (_Lasius flavus_) from 20 to 24, and in Atta from 40 to 52, of these structures. The number of pits on the maxillæ vary much, not always being the same on the two sides of the same insect. We have observed these taste-cups in the honey and humble bee, not only at the base of the second maxillæ (Fig. 288, _g_), but also on the paraglossæ (_pg_). =Distribution in other orders of insects.=—The writer has detected these taste-cups in other orders than Diptera and Hymenoptera. They very generally occur in mandibulate insects on the more exposed surface of the epipharynx (compare pp. 43–46). We have not observed them in the Synaptera (Lepisma and Machilis). In the Dermaptera the taste-cups appear to be undeveloped in the nymph, while in the adult they are fewer in number than in any other pterygote order yet investigated. In a species of Forficula from Cordova, Mexico, the taste-pits are few in number, there being only about a dozen on each side in all; most of them being situated on the anterior half, and a few near the base. The taste-pits are provided each with a short fine seta, as usual arising from the centre. [Illustration: FIG. 286.—Under side of left maxilla of Vespa: _Gm_, taste-cups; _Shm_, protecting hairs; _Tb_, tactile hairs; _Mt_, base of maxillary palpus.—After Will. ] In the order Platyptera (including Perla, Pteronarcys, Psocus, Termes, Eutermes, and Termopsis) we have been unable to detect any organs of taste. [Illustration: FIG. 287.—Section through a taste-cup: _SK_, supporting cone; _N_, nerve; _SZ_, sense-cell.—After Will. This and Figs. 284–286 from Lubbock. ] [Illustration: FIG. 288.—Tongue of worker honey-bee: _pg_, paraglossæ; _B_, the same enlarged, showing the taste-papillæ; _C_, _D_, base of a labial palpus (_mx.′p_) with the taste-papillæ; _E_, taste-cups on paraglossæ of Bombus; _F_, group of same on left, _G_, on right side, at base of labial palpus. ] In the Odonata, however, they are fairly well developed; in Calopteryx, about 50 taste-cups were discovered; in a species of Diplax about 28, there being a group of 14 at the base of the epipharynx on each side of the median line, while in _Æschna heros_ there are two groups of from 25 to 30 taste-cups, situated as in the two aforenamed genera.