:3 PROBABLY HEAR HIGH NOTES. 227 



DO far as I am aware, by Dr. J. Braxton Hicks in his ex- 

 cellent paper on the 'Antennae of Insects,' published in 

 the 22nd volume of the * Linnaean Transactions ; ' and, 

 again, by Dr. Forel in his 'Fourmis de la Suisse. 

 They certainly deserve more attention than they have 

 yet received. The cork-shaped organs (Figs. 6 and 7, e e) 

 occur in allied species; but these stethoscope-like 

 organs have not, so far as I am aware, been yet 

 observed in other insects. They consist of an outer 

 sac (Figs. 6 and 7, s), of a long tube (<), and a posterior 

 chamber (t0), to which is given a nerve (n). 



Forel l also describes these curious organs. He 

 appears to consider that the number varies consider- 



Flg. . 



Tenninnl portion of antenna of Myrmita ruginadit $ x 75. 



ably, namely, from 5 to 12. My own impression is 

 that this difference is only apparent, and that in reality 

 the numbers in each species vary little. Though 



1 Tram, of Lin*<ran Sbe., vol. zxii. p. 391. 

 * Ftmrmit de la tfwutt, p. 301. 



Q 2 



