STATES OF INSECTS. (Imago.) 341 
gradually narrower, is very minutely crenulate from the 
base to the end, and is straight, except at the very sum- 
mit, where it curves inwards. Misled by these and 
similar differences, Mr. Marsham has considered them 
(the sexes both of F. auricularia and Labia minor) as 
distinct species. The tail in a singular genus of weevils 
(Phalidura) terminates, in the males, like that of both 
sexes of the genus just named, in a forceps?. 
The same part of some species of the genus Ephemera 
is furnished with three long, jointed, hairy, bristles. We 
learn from Reaumur with respect to one, that though 
in the female these are all equal in length, yet in the 
male there is only a rudiment of the third. On the 
belly near the anus these males have four fleshy appen- 
dages, the posterior ones setaceous and long, and the 
anterior pair filiform and shorter. ‘They are supposed 
to represent the anal forceps of other insects®, In 
Ephemera vulgata, described by De Geer, both sexes have 
three bristles, but those of the male are the longest; and 
he describes the forceps as consisting of only a pair of 
jointed pieces, forming a bow not unlike the forceps of 
an earwig °. 
v. All the differences I have hitherto noticed between 
the sexes of insects occur in their dodily structure; but 
there are others of a somewhat higher description ob- 
servable in their character. You may smile at the idea 
of character in beings so minute; but if you recollect 
what I formerly related to you when treating upon the 
societies of insects, you will allow that something of this 
* Linn. Trans, xii. 469. t. xxiii. f. 9. 
> Reaum. vi. 494, é, xliv.f. 3—11. ° De Geer ii. ¢. xvii. f. 5—7. 
