422 



COLEOPTERA. 



joints are triangular and compressed, giving thereby a serrate 

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



Fiff. 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- 

 r abet dee, while the geniculate antenna is produced when 



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

 also geniculate); 4, 5, 6, 7, clavate; 8, 0, lamellate; 10, serrate (Dorcatoma) ; 11, ir- 

 regular (Gyrinus) ; 12, two-jointed :mteuna of Art ranes cn?cus. 



FIG. 348. 1, bipec.tinatc: _', llabellate antennae; 3, maxilla? of Hembidinm; 4, of 

 Hydrophilus; 5, of Pselaphus; G, maxillary palpus of Cteuistes; 7, of Tmesipho- 

 rus; 8, of Tyehus. From Lcconte. 



