422 



COLEOPTERA. 



joints are triangular and compressed, giving thereby a serrate 

 outline to the inner edge; or clavate, as in the Silphidce, 



Fig. 347. 



where the enlarged terminal joints give a rounded club-shaped 

 termination ; lamellate, when the terminal joints are prolonged 



Fig. 348. 



internally, forming broad leaf-like expansions, as in the Sca- 

 rabeidce, while the geniculate antenna is produced when 



FIG. 347. Different forms of antennae : 1, serrate ; 2, pectinate; 3, capitate (and 

 also geniculate); 4, 5, 6, 7, clavate; 8, 9, lamellate; 10, serrate (Dorcatoma); 11, ir- 

 regular (Gyrinus) ; 12, two-jointed antenna of Adranes caecus. 



FIG. 348. 1, bipectinate; 2, flabellate antennae; 3, maxillae of Bembidium; 4, of 

 Hydrophilus; 5, of Pselaphus; 6, maxillary palpus of Ctenistes; 7, of Tmesipho- 

 rusj 8, of Tychus. From Leconte. 



