384 EXTERNAL ANATOMY OF INSECTS. 
A, Epicnemis (the Epicnemis). An accessory joint at 
the base of the Tibia in many Arachnida, which 
does not appear to have separate motion *. 
B. Mouuta (the Knee-bail). The convex and sometimes 
bent head of the Z%bza, armed with a horny pro- 
cess on each side, by which it is attached to the 
thigh °. 
C. Tatus (the Ankle). The apex of the Tibza, where it 
is united to the Tarsus ¢. 
D. Caucartia (the Spurs). One, two, or more moveable 
spines, inserted usually at the apex of the Tzbza ; 
and in many Eutrechina, Lepidoptera, and Tri- 
choptera, in the middle also. They may be re- 
garded as a kind of fingers auxiliary to the Tarsus, 
and furnish often an important character in the dis- 
crimination of genera 4. 
E. Coronuta (the Coronula). A coronet or semicoronet 
of fixed spines observable at the apex of the poste- 
rior Tibia in Fulgora candelaria, &c. 
f. Tarsus (the Tarsus). The th principal portion 
of the legs; consisting in the majority of insects of 
1—5 joints, but in the Phalangide of sometimes as 
many as 50°. It includes the Planta, Digitus, and 
Solea. 
A, Pianta (the Instep). The first joint of the Tarsus is 
so called when it is remarkably long and broad ‘. 
It includes the Calz. 
@ Prats XXVIL. Fic. 21. s’”. > Ibid. Fie. 9, 10, 16, 17.2”. 
© [bid. Fre. 34—36. ul". 
4 Ppatre XIV. Fic. 6. and XXVII. Fre. 29—36. v!”’. 
e Prate XIV. Fic. 5—8. and XXVIL. Fic. 44, 45, 62, 63. 2”. 
€ Phare XXVII. Fie. 25, 26, 41. w!”. 
