NO. 2 THORACIC MECHANISM OF A GRASSHOPPER SNODGRASS I3 



Scx^ 



Tar 



C^Ptar 



Fig. 9. — A body segment and leg of Lithobius (Qiilopoda), left side. 



c, dorsal articular point of coxa ; Cx, coxa ; d, ventral articulation of coxa with 

 subcoxa ; Fin, femur ; Ptar, pretarsus ; S, sternum ; Sex, subcoxa ; Sp, spiracle ; 

 T, tergum; Tar, tarsus; Tb, tibia; iTr, first trochanter; 2Tr, second trochanter. 



Sex 



-iTr 



Cx 



Stn 



A 



Fig. 10. — The leg base of Scutigera forceps (Chilopoda). 



A, external view of base of a left leg and part of segment. B, internal view 

 of base of right leg, showing muscles. 



c, dorsal subcoxo-coxal articulation; cpl, supra-coxal plate of subcoxa; Cx, 

 coxa; Fu, furca; /, tergal promotor muscles; /, tergal remoter muscle; K, 

 sternal promotor; L, sternal remoter; M, subcoxo-coxal muscle; A^, sternal 

 adductor of coxa; A'^', furcal adductor of coxa; Sex, subcoxa; Stn, segmental 

 sternite; T, tergum; iTr, first trochanter. 



