STATES OF INSECTS. (Imago.) 321 
one long and one short; but in some, as Saturnia Spinz, 
there is only one short branch or tooth on each joint in 
this sex*. In Ceracampa regalis, &c. only the first part 
of the antenna is so branched; and those of the female 
are setaceous and without branches. In Endromis ver- 
sicolor, &c. there is only one branch from each side on 
every joint; those of the female being much shorter than 
those of the male. The latter sex of Pteronus Laricis, 
a saw-fly, afford an example of a different structure, the 
antennz on one side sending forth a branch from every 
joint but the two first; but on the other side, the nine 
or ten last joints also are without a branch.- The female 
antenna is serrated». In another of this tribe, Ptery- 
gophorus cinctus, the male antenna resembles a single- 
toothed comb, being branched only on one side: that 
of the female, like the former instance, is serrated. 
Whether the remarkable antenne that distinguish the 
known individuals of the genus Phengodes is a sexual 
character has not been ascertained; but it is not impro- 
bable that it may be, as in other Lampyride. A pair of 
delicate flexile and almost convolute plumose branches 
proceeds from the apex of each joint except the basal 
ones, which have something the air of cirri, and give 
a more than usual degree of lightness and elegance to 
these organs’. Other antenne, especially in the Dz- 
ptera order, assume an appearance of plumes—not from 
the branches that proceed from them, but from the fine 
long hairs that beset and adorn them. ‘These are uni- 
versally indications of the male sex, those of the females 
* De Geer i. é. xix. f. 11, 12. Jurine Hymenopt. t. vie f. 8. 
© Pirate XXV-: Fic. 25, 26. 4 Tbid. Fic. 4. 
VOL. III. Ni 
