202 Mr. E. Saunders' Si/nnpsis of British 



Heterogyna, and certainly, as far as we know, do not 

 possess two forms of the female, as the name Heterogyna 

 implies ; exce^^t in this case I have altered but very little 

 the general arrangement of the families. 



I cannot conclude this without acknowledging how 

 much I owe to the kindness and friendship) of the late 

 Mr. Smith ; he was always willing to give all the infor- 

 mation that he possibly could, and never seemed to mind 

 how often one troubled him. I must also thank Messrs. 

 Bridgman, Cameron, Dale, V. Perkins, Billups, Service, 

 and others for the kind manner in which they have lent 

 me specimens, and helped me with observations, &c. 



I hope shortly to publish a similar Synopsis of our 

 British Wasps and Bees. 



HYMENOPTEEA. 



ACULEATA. 



Hairs simjile, or in some cases twisted, but not branched 



or plumose . . . . . . . . . . . . Section 1. 



Hairs more or less branched or plumose, at least those on 



the thorax . . . . . . . . . . . Section 2. 



I have been obliged to adopt the character of the hairs 

 for my primary division, as I can find no other satisfactory 

 structural character. 



Section L 



(2) 1. Petiole of the abdomen with one or more scales or 



nodes ; sexes consisting of ^ , 2 > ^"^ 5 • • Heterogyna. 



(1) 2. Petiole of the abdomen simple; sexes consisting of 



^ and 5 only. 

 (4) 3. Wings not folded longitudinally . . . . . . Fossores. 



(3) 4. Wings (at rest) folded longitudinally .. .. Diplojjtera. 



Heterogyna. 



The form of the abdomen in the Heterogyna, or Ants, 

 easily distinguishes them from any other family of the 

 Hymenoptera. The 1st segment in the Formicidae and 

 Poneridae and the 1st and 2nd in the Myrmicidae are 

 narrowed so as to form a distinct petiole, the single 

 joint in the Formicidse, &c., bearing a transverse upright 

 scale, each of the two joints in the Myrmicidae form- 

 ing a distinct elevated node. All the sexes in the 

 Formicidas are stingless, whereas the ? and ^ ot 



