154 DR. J. B. HICKS ON A NEW STRUCTURE IN THE ANTENNÆ OF INSECTS. 
Fig. 11. a, Antenna of Tetrix ——?, showing about 100 sacs to each joint ; 6, enlarged view of two organs 
hoa above; 4 1, central spot where the connexion with papilla takes place; c, profile view of _ 
sacs, closed from the external air by a membrane, the centre of which is —— 
papilla by means of the delicate line c 1. 
Fig. 12. Antenna of Melolontha vulgaris :—a, enlarged view of surface from above; 4, profile view ail 
: organs; c, a lamella showing the nerves. Diameter of cups about riye, of centre projections 
sy cf am inch. 
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