CHAP. VI. THE IMAGO STATE. 



35 



Filiform or thread-like ; of nearly equal width throughout 

 its entire length(Figs. 91 and 94, a). 



Clavate or club-shaped ; gradually enlarged toward the tip 

 (Figs. 92 and 98). 



Fusiform or spindle-shaped ; largest in the middle, or taper- 

 ing like the root of a carrot (Fig. 93). 



Seteceous, Setiform, or bristle-like ; slender and tapering 

 toward the tip (Fig. 94, 6), 



Moniliform or bead-like ; when the joints are more or less 

 globular, the antenna resembling a string of beads. 



Capitate or knobbed ; terminating in a head or knob at the 

 tip (Figs, 95 and 93). 



Serrate or saw-toothed ; when each joint is prolonged in the 

 form of a small tooth, on the inner side, at the apex or tip of 

 each joint (Figs. 97 and 99). 



Lamellate; when the terminal joints are prolonged inward 

 in the form of flattened plates (Figs. 100 and 101). 



Fig. 102. 



Fig. 100. Fig. 101. 



Fig. 104. 



Fig 105. 



Pectinate or comb-tooth ; when the inner angle of each 

 joint is considerably prolonged at the apex (Fig. 102). 



Bipectinate Pectinate on both sides (Fig 115, a ; some- 

 times called pectinate). 



[For other forms of antennae, see Glossary.] 



The mouth of such insects as masticate their food consists 

 essentially of four parts or sets of organs, namely : the upper 



