20 30 40 50 60 70 80 mm. 



Fig. 92. — Graph to show relative growth of the mandible in the different male forn 



of the stag-beetle, Cyclommatus tarandus. 



Mean mandible-length (mm.) has been plotted logarithmically against mean body-length (mm.) for various si2 

 classes of each of the five male forms (see Fig. 91) : x , prionodont ; +, amphiodont ; Q, telodont ; A. mesodon 

 © tmes amphiodont. 



The various curv« overlap each other in a regular way (see text). 



211 



