6 5 



jd. Posterior leg : tibia equals the total lengths of tarsi i to 4 ; tarsi 2 to 5 unequal in length — the 2nd 

 and 5th longest, the 4th shortest. Ornithoptera <? . 

 ydd. Tibia equals the length of the first 4 tarsi ; the 1st tarsus as long as the other 4 ; the 2nd and 5th 

 the longest, the 4th shortest. Ornithoptera ? . 

 ye. Posterior leg : the tibia equals total length of the first 4 tarsi ; the 1st tarsus nearly half the total 

 length of the 2nd to the 5th. Section Priamoptera $ . 

 jee. Tibia equals the total length of the first 3 tarsi ; and the 1st tarsus equals the total length of 

 the other 4. Priamoptera ? . 

 7/. Posterior leg : tibia equals total lengths of first 3 tarsi ; the 1st tarsus as long as the other 4 ; 

 the last 4 tarsi nearly of equal length. .ZEtheoptera $ . 

 yff. Tibia equals total lengths of first 3 tarsi ; the first tarsus equals in length the other 4 ; 

 the 2nd, 3rd, and 5th tarsi are nearly of uniform length, the 4th shortest. JEtheqptera 2 .* 



8. A pair of sharp curved spines at the termination of the tibia of the 2nd and 3rd pair of legs, throughout the group. 



9. The base of the tarsal claws (or ungues) is bulbose, the bifid claws rather Jong, and graduated to a sharp point ; ; 



fixed to a raised platform at the extremity of the 5th tarsus. [PL III. of this vol. fig. 55.] D. Antimachus $ . 

 ga. The bulbose base of the tarsal claws more depressed, not resting on a raised portion of the .5th tarsus, but 

 inserted in a slight concave depression at the termination of the tarsus ; the bifid claws are not so graduated to 

 their points, but .are slightly swollen midway of their length. [See PL I., figs,, xxxxa and xxxx6.] Genus 

 Ornithoptera. 



•The above measurements may seem unnecessary at present, especially as they only apply to part of a limited group of insects — very little in this way having been 

 done with Lepidoptera ; but all the same I present them, feeling sure that even the most apparently unimportant details of insect measurement may some day prove to be 

 useful, when the subject comes to be more fully studied. As in the human form there is a beautiful series of mathematical and geometrical proportions observed between the 

 dimensions of its different parts and members, so in insect forms we shall be able to discover many beautiful illustrations of these anatomical laws of proportion, which may 

 ultimately prove instructive, even in deciding upon the limits of genera and species. In the study of the Coleoptera this has long been recognised, I may here observe that the 

 above measurements, in each esse, are fairly representative of all the species of each genus, as far as I can judge ; but that there are occasionally slight exceptions to be met 

 with. The general Synopsis of the Genera Trogonoptera and Pompeoptera will be given in the second vol. of this work. 



