402 SYSTEM OF INSECTS. 
nana. This brings us down to the lowest group formed 
out of genera and subgenera : or the family, which from 
its principal genus is named Brachinidtc, and which 
leads us to the gains Brachinus, and the subgenus Aptini. 
Thus we get the following scale, expressing every di- 
vision of an Order, till we arrive at its lowest term, or 
the species that compose it. 
Suborder 
Chilopodimorph'ita M C L. 
Section 
Adephagana Clairv. 
Subsection 
Geodephagena M C L. 
Tribe 
Eutrechma 
Subtribe 
Amaurona 
Stirps 
Truncipennuna Latr. 
Family 
Brachinidce 
Genus 
Braehinus 
Subgenus 
Aptini. 
In the construction of this scale I have endeavoured 
to steer clear of being led by any system, but, with the 
exception of the Suborder, which I assume, to resolve it 
into natural groups gradually decreasing in value, or 
tending to the lowest term, which appear all of them to 
