ably throughout all the genera of the Papilionina?, and 

 indeed throughout the whole order. The legs, consisting 

 of the 5 chief divisions, are each united to the sternum of 

 their respective Thoracic segment by the coxa, which 

 articulates with the sternum, the form being variable in the 

 different insects, and even among the various divisions 

 of the lepidoptera. The tibia, which is generally equal to 

 the length of the femur, is often, but not always, armed 

 with a pair of spines or spurs, at its junction with the tar- 

 sus. In the Ornithoptera these appendages are some- 

 times absent from the anterior legs, which, however, 

 always possess a thickened spine, or hollow cone midway 

 affixed to its underside. All the divisions of the tarsus 

 at their articulation possess a pair of spines slightly longer 



than the numerous spiny hairs that fringe the entire 

 length of the tarsus, and more sparingly (in rows), of the 

 tibia. The divisions of the leg may be reckoned as ten 

 in number, including the ungues (see fig. 16, xxx, A — G). 



Fig. 17. — The antenna? generally possess from 44 or 

 46 to 50 and 52 articulations, ranging from the scapus 

 (or the 1st and most conspicuous joint, which is implanted 

 in its torulus, a cavity of the head between the eyes, and 

 close to the eye) to the more thickened apex. But in 

 Ornithoptera, as in the diurnal and many of the heter- 

 ocerous lepidoptera these articulations are not flexible ; 

 though the antenna? are always more or less curved, espe- 

 cially outside of the Nymphalidse. 



