XXXII INTRODUCTION. 
‘the movements of the wings, and which 
are situated at their base in the other 
hymenopterous insects. * 
The corslet of the workers is gibbous, 
divided equally, and compesed, according 
to De Geer, of three pieces ; the first ~ 
that nearest the head, is thick and round ; 
the second is of less size, extends to the 
under part of the abdomen, and appears 
divided in two transversely; the third, 
much thicker than the second, is trun- 
cated and obtuse. We cannot well define 
the form of the corslet, since it varies 
according to the species; it has four 
stigma, two of which rest in a slight 
lateral depression (which seems to divide 
the corslet), one on each side ; the other 
two are situated near the posterior. ex- 
tremity, to the right and left of the fillet. 
The wings, which are four in number, 
are transparent, large, and sleek; the 
posterior are shorter than the anterior, 
their nervures are slightly coloured, and 
* These observations were communicated to me 
by Professor Jurine, and are a proof of the distin- 
; uishing glance of this able naturalist. 
