d FEMUR (the _Thigh_). The _third_ joint of the leg, long and usually compressed[1090]. It includes the _Gonytheca_.
_A_ GONYTHECA (the _Knee-pan_). A concavity at the apex of the thigh, underneath, to receive the base of the _Tibia_[1091].
e TIBIA (the _Shank_). The _fourth_ joint of the leg, very long, and usually triquetrous[1092]. It includes the _Epicnemis_, _Molula_, _Talus_, _Calcaria_, and _Coronula_.
_A_ EPICNEMIS (the _Epicnemis_). An accessory joint at the base of the _Tibia_ in many _Arachnida_, which does not appear to have separate motion[1093].
_B_ MOLULA (the _Knee-ball_). The convex and sometimes bent head of the _Tibia_, armed with a horny process on each side, by which it is attached to the thigh[1094].
_C_ TALUS (the _Ankle_). The apex of the _Tibia_, where it is united to the _Tarsus_[1095].
_D_ CALCARIA (the _Spurs_). One, two, or more _moveable_ spines, inserted usually at the apex of the _Tibia_; and in many _Carabi_ L., _Lepidoptera_ L., and _Trichoptera_ K., in the middle also. They may be regarded as a kind of fingers auxiliary to the _Tarsus_, and furnish often an important character in the discrimination of genera[1096].
_E_ CORONULA (the _Coronula_). A coronet or semicoronet of _fixed_ spines observable at the apex of the posterior _Tibia_ in _Fulgora candelaria_, &c.
f TARSUS (the _Tarsus_). The _fifth_ principal portion of the legs; consisting in the majority of insects of 1-5 joints, but in the _Phalangidæ_ of sometimes as many as 50[1097]. It includes the _Planta_, _Digitus_, and _Solea_.
_A_ PLANTA (the _Instep_). The first joint of the _Tarsus_ is so called when it is remarkably long and broad[1098]. It includes the _Calx_.
_a_ CALX (the _Heel_). The curving part of the _Planta_, by which it inosculates with the _Tibia_.
_B_ DIGITUS (the _Toe_). The remaining joints of the _Tarsus_ taken together[1099]. It includes the _Allux_ and _Ungula_.
_a_ ALLUX (the _Toe-ball_). The last joint but one of the _Tarsus_, when remarkable, as in Rhyncophorous beetles (_Curculio_ L.)[1100].
_b_ UNGULA (the _Claw-joint_). The last joint of the _Tarsus_, which bears the claws[1101]. It includes the _Arthrium_, _Unguiculi_, and _Plantula_.
[Greek: a] ARTHRIUM (the _Arthrium_). A very minute joint at the base of the claw-joint, in most Tetramerous and Trimerous beetles[1102].