492 



MERJSTIC VARIATION. 



[part I. 



femur itself is flattened antero-posteriorly, having two broad surfaces, 

 morphologically anterior and posterior, and two narrow surfaces which 

 are extensor and flexor surfaces, or morphologically dorsal and ventral. 

 By rotation of the coxa the whole leg may assume a great variety 

 of positions, and it is thus of the utmost consequence that the nature of 

 the surfaces be truly recognized. If the front leg be placed with the 



III 



SL< m 



Fig. 160. Cerambyx scopolii. No. 753. I. The whole beetle seen from ventral 

 surface. II. Details of right anterior coxa bearing extra trochanters and legs. 

 In this figure the legs are rotated so as to shew that SB is an image of SL. 

 III. The same, placed so as to shew that SL is an image of R. 



p, process of coxa locking in the trochanter, srp, sip, corresponding processes 

 for the extra trochanters. (From a specimen belonging to M. H. Gadeau de 

 Kerville.) 



