GUSTATORY CUPS AND PAPILLA 



283 



(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. 



In the order Platyptera (including Perla, 

 Pteronarcys, Psocus, Termes, Eutermes, and 

 Termopsis) we have been unable to detect any 

 organs of taste. 



FIG. 286. Under side of left maxilla 

 of Vespa : Gin, taste-cups; <S/<//?, pro- 

 tecting hairs ; Tb, tactile hairs ; Mi, base 

 of maxillary palpus. After Will. 



FIG. 287. Section through a taste- 

 cup : 5A' supporting cone ; N, nerve ; 

 SZ, sense-cell. After Will. This and 

 . 2S4-2S6 from Lubbock. 



FIG. 288. Tongue of worker honey-bee : pg, para- 

 glossie; B, the same enlarged, showing- the taste-papillae ; 

 C, I), base of a labial palpus (ma-. j>) with the taste- 

 papilla' ; E, taste-cups on paragloss* of Bombus ; f\ 

 jji-oup of same ou 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 ^Eschna heros there are two groups of from 25 to 30 taste-cups, 

 situated as in the two aforenamed genera. 



In the Orthoptera the gustatory cups are numerous, well developed, and pres- 

 ent in all the families except the Phasmidfe, where, however, they may yet be 

 found to occur. 



