368 EXTERNAL ANATOMY OF INSECTS. 
Arms*. It includes the Spzracula Antepectoralia, 
Prosternum, Antefurca, and Brachia. 
A. Sprracuta ANTEPECTORALIA (the Antepectoral Spi- 
racles). A pair of breathing-pores fixed in the mem- 
brane that connects the Antepectus with the Medi- 
pectus®. 
B. ProsTernvum (the Forebreast-bone). A longitudinal 
or other elevation of the Antepectus between the 
Brachia °. 
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 4. 
D. Bracuia (the Arms). The first pair of legs of Hex- 
apods, the direction of which is usually towards the 
head; when spoken of with the other legs, called 
the Fore-legs«. They include the Clavicula, Scapula, 
Humerus, Cubitus, and Manus. 
a. Cuavicuta (the Clavicle). The first joint of the Bra- 
chium, answering to the Cova in the legs. 
b. Scaputa (the Scapula). The second joint of the Bra- 
chium, 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. Cuxrrus (the Cubitus). ‘The fourth and elongated 
a Pyare VIII. Fic. 3, 11. > Prate XXIX. Fic. 12. c’. 
© Prate VIII. Fie. 2, 11. a’. 4 Pratre XXII. Fie. 7. eé’. 
¢ M. Latreille, in his Organisation Extérieure des Insectes (| Mém. 
du Mus. viii. 198.) proposes calling the fore-legs of Hexapods Pro- 
pedes ; but having long ago applied this term to the false legs of ca- 
terpillars (see above, Vot. II. p, 288, &c.), we shall not adopt it. 
