p 



NO. 2 



HONEY BEE SNODGRASS 



67 



Fig. 22. — The mesothoracic leg and its muscles. 



A, right middle leg of drone, posterior view. B, same of worker, posterior view. C, endo- 

 sternum of pterothorax and mesothoracic coxa, with thoracic muscles of leg, left side (coxa 

 turned outward). D, base of right middle leg of drone, posterior view, showing trochanteral 

 and femoral muscles. E, tibio-tarsal joint of right middle leg of drone, dorsal view. F, same, 

 ventral view. G, trochanter and base of femur of left middle leg of drone, with muscles, 

 mesal view. H, diagram of dicondylic femoro-tibial joint. I, diagram of monocondylic tibio- 

 tarsal joint (lateral muscles not shown). J, femoro-tibial joint of right middle leg of drone, 

 ventral view. K, end of femur with tibia removed, ventral view. L, base of tibia, ventral 

 view, showing levator muscle {j^o) and chordotonal ligament (o). M, tarsus and pretarsus of 

 right middle leg of drone, dorsal view. 



d, pleural articulation of coxa; e. sternal articulation of coxa; /, anterior coxal articular 

 process of trochanter; h, dorsal articulation of trochantero-fernoral joint; ;, anterior femoro- 

 tibial articulation; k, posterior femoro-tibial articulation; m, tibia! articular process of tibio- 

 tarsal joint; n, tarsal articular knob of tibio-tarsal joint; o, tendon of femoral chordotonal 

 organ; p. process of endosternum giving attachment to muscle jS; q, process of supraneural 

 bridge of endosternum giving attachment to muscle iz. 



