15-4 DR. J. B. HICKS ON A NEW STRUCTURE IN THE ANTENNAE OF INSECTS. 



Fi". 11. a. Antenna of Tetrix ?, showing about 100 sacs to each joint ; b, enlarged view of two organs 



from above; b 1, central spot where the connejcion with papilla takes place; c, profile view of 

 sacs, closed from the external air by a membrane, the centre of which is in connexion with the 

 papilla by means of the delicate line c 1 . 



Fig. 12. Antenna of Melolontha vulgaris: — a, enlarged \'iew of surface from above: b, profile view of 

 organs ; c, a lamella showing the nerves. Diameter of cups about ,— Vii) of centre projection 

 j-jVxi of an inch. 



