236 Transactions of the Boyal Microsco^ieal Society. 
interrupted by small non-resisting spines whicli serve as tactile 
organs. The orifice of the canal by which the liquids ascend is 
situated on the lower face below the first thread of the screw. The 
figures beneath render suiBficiently intelligible this short description. 
A B C 
A, profile view ; B, seen from beneath ; 0, from above ; t, internal canal ; 
o, aperture of canal. 
"Not content with examining 0. Fullonica, I studied 0. Sala- 
miniay 0. materna, and 0. imperator, which all had auger-like pro- 
bosces. The structure of these maxillae affords a generic character 
of great value ; it moreover establishes a closer relation between 
the lepidopters, the hemipters, and certain dipters which have 
maxillae adapted to pierce tissues." 
