AMAZON ANTS. 299 
In compound ant-hills I have now and 
then observed some very remarkable in- 
dividuals which may be seen delineated 
in Pl. 2. fig. 1. These are Rufescent 
Ants, equalling, in size, females of the same 
species, differing only in the form of their 
thorax, which is not enlarged, and des- 
tined to bear wings; it resembles that of 
the labourers. These individuals are, 
from their size, classed with females, but 
they do not possess wings. I should 
have assigned them a place among the 
labourers, had I ever seen them take part 
in their excursions.* Here then is 
* “Tt is remarkable,” says Gould, “ of com- 
mon yellow and hill-settlements, (alluding to the 
nests of F. flava and F. rufa,) that you will find 
two sizes of workers in most of theni, the larger 
exceed the less about one part in three ; but there 
is no apparent difference as to contexture or other 
circumstances. They are mutually interspersed 
all over the colony, and carry on the same offices 
of labour and employment.” This observation of 
Gould is confirmed by specimens in the cabinet of 
Mr. Kirby. This gentleman informs us, that he 
saw them labouring in the colony, and that the 
large workers of F’. rufa are, nearly three times, 
and of F, flava twice the size of the small ones, —T. 
o 6 
