1932 ] 
Tihial Muscles of Aphids 
67 
placed on the wall of the tibia. “It appears that the wall of 
the tibia performs the function of the lost antagonistic 
muscle of the tarsus of aphids.” No articular membrane 
could be seen. 
Species represented on Plate II. 
A. Aphis rumicis 
B. Aphis feminea 
C. Drepanaphis acerifolii 
D. Colopha ulmicola 
E. Eriosoma lanigerum 
F. Schizoneura americana 
G. Articulation of tarsus and tibia (diagrammatic) 
H. Aphis sambucifolii 
