166 INTERNAL ANATOMY OF INSECTS. 
consequence in most instances incapable of concep*'on?*. 
Upon these sterile females, you also heard, devolve in 
general the principal labours of their respective colonies, 
showing the beneficent design of PROVIDENCE in exempt- 
ing them from sexual cares and desires, and meriting for 
them the more appropriate name, now generally used, of 
workers. The differences in the structure of the female 
bee and the workers were also then accounted for; and 
similar reasoning may be had recourse to with regard to 
those of ants, in which the worker and the female differ 
still more materially. My reason for introducing this 
subject here, is to observe to you that I have some 
grounds for thinking that this system extends further 
than is usually supposed, and that to each species in 
some Coleopterous and other genera there are certain 
individuals intermediate between the male and female ; 
this I seem to have observed more especially in Copris 
and Onthophagus. Yor in almost every British species 
in my cabinet of these genera I possess such an indivi- 
dual, distinguished particularly by having a horn on the 
head longer than that of the female, but much shorter 
than that of the male. I once observed a pair of Pen- 
tatoma oleracea, a very pretty bug, 7m coitu, both sexes 
being ornamented with white spots, and by them stood 
a third distinguished from them by red ones. I do not, 
however, build on this circumstance, though singular ; 
but mention it merely that you may keep it in your eye. 
It would be curious should it turn up, that, to answer 
some particular end of PRoviDENCE, in some tribes of 
insects there are two kinds of males, as in the gregarious 
ones two descriptions of females. 
4 Vor. If. p. 50, L11—, 118—, 127—, 134. The newters of the 
Termites, however, (p. 33.) seem to be a distinct sex, if I may so 
speak—and to merit that name. ‘ 
