8 



The Form of Insects 



of these segments. But no single segment of the body 

 carries more than one pair of limbs or appendages. In 

 the cockroach's head we shall find four pairs of ap- 

 pendages. We are therefore led to conclude that in the 

 head there are at least four segments fused together. 

 And when development is taken into account it will be 

 found that the number of segments in the insect head 

 is certainly greater than this. 



Fig. 6. — Various forms of the feelers in Beetles, a. Ludius ; b. Corymbites ; c. 

 Prionocyphon ; d. Acneus ; e. Dendroides ; /. Dineutes ; g. Lachnosterna ; 

 k. Bolbocerus ; i. Adranes. Highly magnified. From Riley (after Leconte 

 and Horn), Insect Life, vol. 7 (U.S. Dept. Agric). 



Feelers. — The first pair of appendages are the 

 feelers {antenna:). These are inserted in sockets at either 

 side of the crown, close to its junction with the face 

 (fig. 3). They are long slender organs, a little longer 

 than the body in the male cockroach, not quite as long 



