186 THE HISTORY OF CREATION. 
of the class. In the first place, we may distinguish two 
main divisions, namely, Flies with chewing mandibles 
(Mesticantia) and Flies with sucking mouths (Sugentia). 
On a closer examination each of these two divisions may 
again be divided into two sub-groups. Among chewing 
Flies, or Masticantia, we may distinguish the biting and 
the licking ones. Biting flies (Mordentia) comprise 
the most ancient and primzval winged Flies, the gauzy- 
winged (Neuroptera), straight-winged (Orthoptera), and 
beetles (Coleoptera). Licking flies (Lambentia) are re- 
presented by the one order of skin-winged (Hymenoptera) 
Flies. We distinguish two groups of Sucking Flies, or 
Sugentia, namely, those which prick and those which sip. 
There are two orders of pricking Flies (Pungentia), those 
with half wings (Hemiptera) and gnats and blow-flies, 
(Diptera); butterflies are the only sipping Flies (Sorbentia), 
Lepidoptera. 
Biting Flies, and indeed the order of Primeval Flies 
(Archiptera, or Pseudoneuroptera) are nearest akin to 
the still living Flies, and include the most ancient of 
all Flies, the primary forms of the whole class (hence 
also those of all Tracheata). Among them are, first of 
all, the Ephemeral Flies (Ephemera) whose larvze which 
live in water, in all probability still show us in their 
trachez-gills the organs out of which the wings of Flies 
were originally developed. ‘his order further contains 
the well known dragon-flies, or Libellula, the wine-glass 
sugar mites (Lepisma), the hopping Flies with bladder- 
like feet (Physopoda), and the dreaded Termites, fossil 
remains of which are found even in coal. The order 
