1. PROTHORAX (the _Prothorax_). The upper part or the shield of the manitrunk, in _Coleoptera_, _Orthoptera_, &c. called by way of eminence the _Thorax_[999]. It includes the _Ora_, _Patagia_, _Umbones_, and _Phragma_.
A ORA (the _Ora_). The inflexed or inferior lateral margin of the _Prothorax_, separated in many genera from the _Antepectus_ by a suture[1000].
B PATAGIA (the _Patagia_). Two corneous scales observable in _Lepidoptera_, fixed on each side of the trunk, just behind the head, and covered with a long tuft of hair[1001].
C UMBONES (the _Bosses_). Two moveable bosses surmounted by a spine, with which the _Prothorax_ of the Coleopterous genus _Macropus_ is armed.
D PHRAGMA (the _Phragm_). The _Septum_ that closes the posterior orifice of the _Prothorax_ in _Gryllotalpa_ Latr.
2. ANTEPECTUS (the _Forebreast_). The underside or breastplate of the manitrunk, and the bed of the _Arms_[1002]. It includes the _Spiracula Antepectoralia_, _Prosternum_, _Antefurca_, and _Brachia_.
A SPIRACULA ANTEPECTORALIA (the _Antepectoral Spiracles_). A pair of breathing-pores fixed in the membrane that connects the _Antepectus_ with the _Medipectus_[1003].
B PROSTERNUM (the _Forebreast-bone_). A longitudinal or other elevation of the _Antepectus_ between the _Brachia_[1004].
C ANTEFURCA (the _Antefurca_). An internal vertical process of the _Antepectus_, consisting usually of two branches, which afford a point of attachment to muscles of the _Brachia_[1005].
D BRACHIA (the _Arms_). The first pair of legs of _Hexapods_, the direction of which is usually towards the head; when spoken of with the other legs, called the _Forelegs_[1006]. They include the _Clavicula_, _Scapula_, _Humerus_, _Cubitus_, and _Manus_.
a CLAVICULA (the _Clavicle_). The _first_ joint of the _Brachium_, answering to the _Coxa_ in the legs.
b SCAPULA (the _Scapula_). The _second_ joint of the _Brachium_, answering to the _Trochanter_ in the legs.
c HUMERUS (the _Humerus_). The _third_ and elongated joint of the _Brachium_, answering to the _Femur_ in the legs.
d CUBITUS (the _Cubitus_). The _fourth_ and elongated joint, answering to the _Tibia_ in the legs. It includes the _Coronula_ and _Calcaria_. . _A_ CORONULA (the _Coronula_). A coronet or semicoronet of spines, observable at the apex of the _Cubitus_ or _Tibia_ of some insects.--Ex. _Dilophus_ Latr., _Fulgora_ L.